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| 1 | Experimental research on coal seam similar material proportion and its application显示文摘In this paper, the optimization design of the low strength mechanical test and orthogonal test have been analyzed in order to simulate the mechanical properties of thick and extra-thick coal seam accurately in a similar material simulation test. The results show that the specimen can reach a wider range of strength when cement has been used compared to that of gypsum, suggesting that cement is more suitable for making coal seam in similar material simulation tests. The uniaxial compressive strength is more sensitive to cement than coal or sand. The proportion of coal and sand do not play a decisive role in uniaxial compressive strength. The uniaxial compressive strength and specimen density decrease as the mass percent of coal and aggregate–binder ratio rise. There is a positive correlation between uniaxial compressive strength and density. The No. 5 proportion(cement: sand: water: activated carbon: coal = 6:6:7:1.1:79.9)was chosen to be used in the similar material simulation test of steeply dipping and extra-thick coal seam with a density of 0.913 g/cm^3 and an uniaxial compressive strength of 0.076 MPa which are in accordance with the similarity theory. The phenomenon of overburden stratum movement, fracture development and floor pressure relief were obtained during the similar material simulation test by using the proportion. | Cheng Weimin Sun Lulu Wang Gang Du Wenzhou Qu Hongyuan | 2016 | International Journal of Mining Science and Technology2016，26，5： | 12 |
| 2 | Major accident analysis and prevention of coal mines in China from the year of 1949 to 2009显示文摘From the year of 1949 to the present, the China national coal output has been increasing quickly and became first in the world in 2009. But at the same time, major coal mining accidents still exist nowadays. In order to review the overall situation and provide information on major accidents of coal mines in China, we investigated 26 major coal mining accidents in China between the years of 1949 and 2009 through statistical methods, each of which led to more than 100 fatalities. Statistical characteristics about accident-related factors such as time, death toll, accident reasons, characters and nature of enterprise were analyzed. And some special conclusions have been achieved. For example, although we have made great progress, the safety situation in China coal mining industry is still serious, and the reasons for the mining accidents are all human errors which are not inevitable. Such results may be helpful to prevent major accidents in coal mines. Moreso, based on both the knowledge of other countries which have good safety situation nowadays and the safety management situation of China, we made suggestion on safety management of China coal mining. In conclusion, countermeasures were proposed in accordance with the results of statistical studies and the analyses of problems existed in coal mines, including the perfec- tion of safety supervision organization, the establishment of cooperating agency among government, coal mines and workers, the perfection of safety rules and regulations, the improvement of safety investment, the enhancement of safety training, the development of safety technique, and the development of emer- gency rescue technique and equipment. | Wu Lirong Jiang Zhongan Cheng Weimin Zuo Xiuwei Lv Dawei Yao Yujing | 2011 | Mining Science and Technology2011，21，5： | 12 |
| 3 | Tribological evaluation of environmentally friendly ionic liquids derived from renewable biomaterials显示文摘Unlike most of the conventional ionic liquids(ILs) derived from non-renewable resources, five environmentally friendly ILs([Ch][AA] ILs) derived from amino acids(AAs) and choline(Ch) were synthesized using biomaterials by a simple, green route: acid–base reaction of Ch and AAs. The thermal and corrosion properties, as well as viscosity, of the prepared ILs were examined. The results revealed that the anion structure of ILs plays a dominant role in their thermal and viscosity behavior. These ILs exhibited less corrosion toward copper, related to their halogen-, sulfur-, and phosphorus-free characteristics. The tribological behavior of the synthesized ILs was examined using a Schwingungs Reibung und Verschleiss tester, and the results indicated that these ILs exhibit good friction-reducing and anti-wear properties as lubricants for steel/steel contact. Results from energy-dispersive spectroscopy and X-ray photoelectron spectroscopy indicated that the good tribological properties of [Ch][AA] ILs are related to the formation of a physically adsorbed film on the metal surface during friction. | Cheng JIANG Weimin LI Jingyan NIAN Wenjing LOU Xiaobo WANG | 2018 | Friction2018，6，2： | 7 |
| 4 | Dust removal efficiency of high pressure atomization in underground coal mine显示文摘To master theoretical calculation for dust removal efficiency of high pressure atomization in an underground coal mine, the corresponding atomization characteristics and dust removal efficiency were both comprehensively studied in theory by virtue of related theories of hydromechanics and aerosol.According to actual measurements of flow coefficients and atomization angles of X-type swirl nozzle,computational formula was derived for atomized particle sizes of such a nozzle in conjunction with relevant empirical equation. Moreover, a mathematical model for applying high pressure atomization to dust removal in underground coal mine was also established to deduce theoretical computation formula of fractional efficiency. Then, Matlab was adopted to portray the relation curve between fractional efficiency and influence factors. In addition, a theoretical formula was also set up for removal efficiency of respirable dust and total coal dust based on dust size and frequency distribution equations. In the end,impacts of dust characteristic parameters on various dust removal efficiencies were analyzed. | Pengfei Wang Xuanhao Tan Weimin Cheng Gang Guo Ronghua Liu | 2018 | International Journal of Mining Science and Technology2018，28，4： | 5 |
| 5 | Synthesis and evaluation of a protic ionic liquid as a multifunctional lubricant additive显示文摘An oil soluble multifunctional protic ionic liquid(IL)was synthesized and its tribological and antioxidant properties in poly alpha olefin(PA04)were investigated.The tribological results demonstrated that the IL significantly reduced friction and wear of PA04.The PA04 blend with IL resulted in an induced oxidation time of 555 min which is 8.2 and 3.5 times higher than that of pure PA04 and PA04 with zinc dialkyl dithiophosphate(ZDDP)for the rotating pressure vessel oxidation test.It is likely that free nonylated diphenylamine acted as a radical scavenger to enhance antioxidant performance,while free bis(2-ethylhexyl)phosphate was more prone to adsorb and react with the metal surface to form a phosphorus-rich tribofilm in order to protect the rubbing surface. | Cheng JIANG Yanan WANG Huaigang SU Weimin LI Wenjing LOU Xiaobo WANG | 2020 | Friction2020，8，3： | 5 |
| 6 | Effects of atomization parameters of dust removal nozzles on the de-dusting results for different dust sources显示文摘In order to obtain appropriate spray pressure and enhance the spraying and dust removal efficiency, various factors including the dust characteristics, nozzle spraying angle, effective spraying range, water consumption and droplet size are taken into account. The dust characteristics from different mines and atomization parameters of different pressure nozzles were measured. It was found that the internal pressure of coal cutters and roadheaders should be kept at 2 MPa, which could ensure large droplet size, large spraying angle and low water consumption and hence realizing a large-area covering and capture for large particle dusts. However, the external spray pressure should be kept at 4 MPa for smaller droplet size and longer effective spraying range, leading to effective dust removal in the operator zone. The spray pressure of support moving, drawing opening, and stage loader on a fully mechanized caving face and stage loader on a fully mechanized driving face should be kept at 8 MPa, under which the nozzles have long effective spraying range, high water flow and small droplet size for the rapid capture of instantaneous, high-concentration and small size dust groups. From the applications on the caving and driving faces in the coal mines, it is indicated that the optimization of spray pressure in different spraying positions could effectively enhance dust removal efficiency. Selecting appropriate nozzles according to the dust characteristics at different positions is also favorable for dust removal efficiency. With the selected nozzles under optimal pressures, the removal rates of both total dust and respirable dust could reach over70%, showing a significant de-dusting effect. | Cheng Weimin Ma Youying Yang Junlei Sun Biao | 2016 | International Journal of Mining Science and Technology2016，26，6： | 4 |
| 7 | In situ generation of Li_(3)N concentration gradient in 3D carbon-based lithium anodes towards highly-stable lithium metal batteries显示文摘The uncontrolled dendrite growth of lithium metal anodes(LMAs)caused by unstable anode/electrolyte interface and uneven lithium deposition have impeded the practical applications of lithium metal batteries(LMBs).Constructing a robust artificial solid electrolyte interphase(SEI)and regulating the lithium deposition behavior is an effective strategy to address these issues.Herein,a three-dimensional(3D)lithium anode with gradient Li_(3)N has been in-situ fabricated on carbon-based framework by thermal diffusion method(denoted as CC/Li/Li_(3)N).Density functional theory(DFT)calculations reveal that Li_(3)N can effectively promote the transport of Li^(+)due to the low energy barrier of Li^(+)diffusion.As expected,the Li_(3)N-rich conformal artificial SEI film can not only effectively stabilize the interface and avoid parasitic reactions,but also facilitate fast Li^(+)transport across the SEI layer.The anode matrix with uniformly distributed Li3N can enable homogenous deposition of Li,thus preventing Li dendrite propagation.Benefiting from these merits,the CC/Li/Li_(3)N anode achieves ultralong-term cycling for>1000 h at a current density of 2 m A cm^(-2)and dendrite-free Li deposition at an ultrahigh rate of 20 m A cm^(-2).Moreover,the full cells coupled with LiFePO4cathodes show extraordinary cycling stability for>300 cycles in liquidelectrolyte-based batteries and display a high-capacity retention of 96.7%after 100 cycles in solid-state cells,demonstrating the promising prospects for the practical applications of LMBs. | Wenzhu Cao Weimin Chen Mi Lu Cheng Zhang Du Tian Liang Wang Faquan Yu | 2023 | Journal of Energy Chemistry2023，，1： | 4 |
| 8 | Sediment microbial fuel cell with floating biocathode for organic removal and energy recovery显示文摘 | Aijie WANG Haoyi CHENG Nanqi REN Dan CUI Na LIN Weimin WU | 2012 | Frontiers of Environmental Science & Engineering2012，6，4： | 4 |
| 9 | High-performance all-solid-state polymer electrolyte with fast conductivity pathway formed by hierarchical structure polyamide 6 nanofiber for lithium metal battery显示文摘The utilization of all-solid-state electrolytes is considered to be an effective way to enhance the safety performance of lithium metal batteries.However,the low ionic conductivity and poor interface compatibility greatly restrict the development of all-solid-state battery.In this study,a composite electrolyte combining the electrospun polyamide 6(PA6)nanofiber membrane with hierarchical structure and the polyethylene oxide(PEO)polymer is investigated.The introduction of PA6 nanofiber membrane can effectively reduce the crystallinity of the polymer,so that the ionic conductivity of the electrolyte can be enhanced.Moreover,it is found that the presence of finely branched fibers in the hierarchical structure PA6 membrane allows the polar functional groups(C=O and N-H bonds)to be fully exposed,which provides sufficient functional sites for lithium ion transport and helps to regulate the uniform deposition of lithium metal.Moreover,the hierarchical structure can enhance the mechanical strength(9.2 MPa)of the electrolyte,thereby effectively improving the safety and cycle stability of the battery.The prepared Li/Li symmetric battery can be stably cycled for 1500 h under 0.3 mA cm^(-2) and 60℃.This study demonstrates that the prepared electrolyte has excellent application prospects in the next generation all-solid-state lithium metal batteries. | Lu Gao Jianxin Li Jingge Ju Bowen Cheng Weimin Kang Nanping Deng | 2021 | Journal of Energy Chemistry2021，30，3： | 4 |
| 10 | Evaluation of the immunomodulatory effects of anti-COVID-19 TCM formulae by multiple virus-related pathways显示文摘Dear Editor,The coronavirus infectious disease 2019(COVID-19)outbreak is seriously endangering human health.Most patients with severe COVID-19 are characterized by sustained cytokine production and hyper-inflammation,which is known as cytokine storm syndrome.1-3 Elaborating the anti-inflammatory response is crucial to these patients,and interieukin-6(IL6)inhibitors and steroids have been recommended in clinical practice.1 However,after the cytokine storm phase,the host immune response to sepsis may develop into a protracted immunosuppressive phase. | Liansheng Qiao Wenting Huang Xiaoling Zhang Hongyan Guo Dong Wang Quansheng Feng Ronghua Jin Lan Xie Weimin Li Jing Cheng | 2021 | Signal Transduction and Targeted Therapy2021，6，3： | 4 |
| 11 | Effect of dosage of expandable graphite,dimethyl methylphosphonate,triethanolamine,and isocyanate on fluidity,mechanical,and flame retardant properties of polyurethane materials in coal reinforcement显示文摘In this study,orthogonal experiments were conducted to investigate the influence of expandable graphite(EG),dimethyl methylphosphonate(DMMP),triethanolamine(TEA),and isocyanate content on the compressive and bonding strengths,oxygen index,and fluidity of rigid polyurethane foam(RPUF).The results revealed that EG significantly increased the oxygen index of RPUF,enlarged the diameter of foam cells,and decreased the cell-closed content in foam;thus,leading to a pressure drop in RPUF.However,excessive EG was capable of reducing the fluidity of polyurethane slurry.TEA exhibited significant influence on the compressive strength of RPUF,which dropped initially,and then increased.DMMP had a remarkable effect on the flame retardant property and compressive strength of RPUF.Compressive strength of RPUF initially displayed an increase followed by a decrease with increasing dosage of DMMP,and achieved the maximum value at DMMP dosage of 4%.DMMP could effectively reduce the diameter of RPUF cells leading to an increase in the percentage of close area in foam.DMMP displayed the flame-retardation effects mainly in the gas phase leading to a significant enhancement in the oxygen index of RPUF.Moreover,the compressive strength and bonding strength of RPUF decrease significantly with the increase of isocyanate content due to the increased blowing efficiency by the CO_2.The oxygen index and flowing length of foam increased with the increase in isocyanate dosage. | Hu Xiangming Wang Deming Cheng Weimin | 2016 | International Journal of Mining Science and Technology2016，26，2： | 3 |
| 12 | Identification of the candidate genes associated with cellular rejection in pig-to-human xenotransplantation显示文摘To identify the genes associated with cellular rejection in pig-to-human xenotransplantation, the suppression subtractive hybridization (SSH) was used in screening the up-regulated genes from a co-culture of human peripheral blood mononuclear cells (PBMCs) and porcine vascular endothelial cell line PIEC. The up-regulated cDNAs were cloned into pGEM-T Easy vector and then sequenced. Nucleic acid homology searches were performed using the BLAST program. A subtracted cDNA library including about 300 clones with the expected up-regulated genes was obtained. Twenty-four of these clones were analyzed by sequencing and homology comparison was made. These clones represent the genes of human perforin (PRF1), proteasome, lymphocyte specific interferon regulatory factor/interferon regulatory factor 4 (LSIRF/IRF 4), muscleblind-like (MBNL) protein and a porcine expressed sequence tag (EST) which has 81% homology with human oxidative-stress responsive 1 (OSR 1). These genes might be the candidate genes which are associated with cellular rejection in pig-to-human xenotransplantation. | HU Weimin, CHENG Jingqiu, LI Youping , LI Shengfu, LU Xiaofeng and WAN Lin(Laboratory of Transplant Engineering and Immunology, West China Hospital, Sichuan University, Chengdu 610041, China) | 2002 | Progress in Natural Science:Materials International2002，12，9： | 3 |
| 13 | Proteomics provides individualized options of precision medicine for patients with gastric cancer显示文摘While precision medicine driven by genome sequencing has revolutionized cancer care,such as lung cancer,its impact on gastric cancer(GC)has been minimal.GC patients are routinely treated with chemotherapy,but only a fraction of them receive the clinical benefit.There is an urgent need to develop biomarkers or algorithms to select chemo-sensitive patients or apply targeted therapy.Here,we carried out retrospective analyses of 1,020 formalin-fixed,paraffin-embedded GC surgical resection samples from 5 hospitals and developed a mass spectrometry-based workflow for proteomic subtyping of GC.We identified two proteomic subtypes:the chemo-sensitive group(CSG)and the chemo-insensitive group(CIG)in the discovery set.The 5-year overall survival of CSG was significantly improved in patients who had received adjuvant chemotherapy after surgery compared with those who received surgery only(64.2%vs.49.6%;Cox P-value=0.002),whereas no such improvement was observed in CIG(50.0%vs.58.6%;Cox P-value=0.495).We validated these results in an independent validation set.Further,differential proteome analysis uncovered 9 FDA-approved drugs that may be applicable for targeted therapy of GC.A prospective study is warranted to test these findings for future GC patient care. | Wenwen Huang Dongdong Zhan Yazhuo Li Nairen Zheng Xin Wei Bin Bai Kecheng Zhang Mingwei Liu Xuefei Zhao Xiaotian Ni Xia Xia Jinwen Shi Cheng Zhang Zhihao Lu Jiafu Ji Juan Wang Shiqi Wang Gang Ji Jipeng Li Yongzhan Nie Wenquan Liang Xiaosong Wu Jianxin Cui Yongsheng Meng Feilin Cao Tieliu Shi Weimin Zhu Yi Wang Lin Chen Qingchuan Zhao Hongwei Wang Lin Shen Jun Qin | 2021 | Science China(Life Sciences)2021，64，8： | 3 |
| 14 | Investigation of tribological characteristics of nickel alloybased solid-lubricating composites at elevated temperatures under vacuum显示文摘The development of a high‐performance solid‐lubricating composite with excellent self‐lubricity over a broad temperature range in vacuum is significant to solve the frictional problems of spatial mechanisms.In this study,the vacuum tribological behaviors of nickel‐matrix/Ag/(Ca,Ba)F2/graphite(0–2 wt%)composites were studied from 25 to 800°C.The results show that the synergistic effects of solid lubricants can significantly improve the tribological properties of the composites in vacuum,with the graphite content contributing considerably.For 2 wt%graphite,a low friction coefficient(0.14–0.25)and the lowest wear rate((0.12–4.78)×10^(-5) mm^(3)∙N^(-1)∙m^(-1))were observed in vacuum over the entire testing temperature range.Moreover,the wear mechanisms were clarified via analysis of the chemical composition and morphologies of the sliding surfaces. | Jinming ZHEN Jun CHENG Hui TAN Qichun SUN Shengyu ZHU Jun YANG Weimin LIU | 2021 | Friction2021，9，5： | 2 |
| 15 | Hepatitis B virus subgenotyping: History, effects of recombination, misclassifications, and corrections显示文摘 | Weifeng Shi Zhong Zhang Cheng Ling Weimin Zheng Chaodong Zhu Michael J. Carr Desmond G. Higgins | 2013 | Infection Genetics and Evolution2013，，： | 2 |
| 16 | A versatile nano-TiO_(2) decorated gel separator with derived multi-scale nanofibers towards dendrite-blocking and polysulfide-inhibiting lithium-metal batteries显示文摘In this study,a versatile fluorine-bearing gel membrane with multi-scale nanofibers was rationally designed and synthesized via facile one-step blend electrospinning of nano-titanium dioxide(TiO_(2))particles and fluorinated poly-m-phenyleneisophthalamide(PMIA)polymer solution.The prepared multiscale TiO_(2)-assisted gel separator presented relatively high porosity,small aperture,giving rise to superior affinity to electrolyte and sufficient active sites to accelerate lithium ions migration.Meanwhile,the asfabricated multifunctional GPE also rendered outstanding heat-resistance and well-distributed lithiumions flux,and the mutual overlaps between the coarse fibers and the fine fibers within the multi-scale nanofiber membrane provided a strong skeleton support,which in turn laid a solid footing stone for high-security and dendrite-proof batteries.Particularly,the nano-TiO_(2) particles within PMIA membrane acted as'gatekeepers',which can not only resist the growth of lithium dendrites,but also intercept the dissolved polysulfide on cathode side.Based on these merits,the gel PMIA-based lithium cobalt(LCO)/lithium battery obtained the remarkably improved rate capability and cycle performances on account of superior ionic conductivity,steady anodic stability window and weakened polarization behavior.Meanwhile,the resultant lithium-sulfur cell also delivered the outstanding cycling stability with the aid of the greatly prevented'shuttle effect'of dissolved lithium polysulfides based on the physical trapping and chemical binding of the prepared GPE to polysulfides species.This work proved that the addition of functional inorganic nanoparticles similar with TiO_(2) in multi-scale gel PMIA membrane can enhance the lithium ions transport capability,resist the growth of lithium dendrites as well as inhibit the shuttle effect of polysulfides,which would prompt a great development for dendrite-blocking and polysulfideinhibiting lithium-metal cells. | Huijuan Zhao jing Yan Nanping Deng Weimin Kang Bowen Cheng | 2021 | Journal of Energy Chemistry2021，30，4： | 2 |
| 17 | Roles of metal element substitutions from the bimetallic solid state electrolytes in lithium batteries显示文摘All-solid-state lithium batteries(ASSLBs),receiving extensive attentions and studies,exhibit better safety,environmental friendliness,stability,wider electrochemical stability window and higher energy density than traditionally liquid lithium batteries.In a variety of inorganic materials,with highly replaceable,the non-lithium metal elements emerge in endlessly and affect performances in diversiform ways.Due to facile preparation,convertible structures and excellent properties,the lithium-containing bimetallic granular materials are often applied as important components of electrolytes in lithium batteries.In this review,in terms of the properties of substituted elements,changing crystal structures,increasing vacancies or defects and improving the interfacial conductions,the roles of metal element substitutions of inorganic particles on the improvement of solid-state electrolytes are expounded.And the applications of substituted strategies in ASSLBs as the host of inorganic particles electrolytes and as fillers or modifications for composite electrolytes are also investigated and discussed.It also summarizes the current concerns and obstacles that need to be broken through,as well as provides a basis guide for the selection and optimization of inorganic particles. | Wen Yu Nanping Deng Lin Tang Kewei Cheng Bowen Cheng Weimin Kang | 2022 | Particuology2022，20，6： | 2 |
| 18 | CmBES1 is a regulator of boundary formation in chrysanthemum ray florets显示文摘Chrysanthemum(Chrysanthemum morifolium)is an ideal model species for studying petal morphogenesis because of the diversity in the flower form across varieties;however,the molecular mechanisms underlying petal development are poorly understood.Here,we show that the brassinosteroid transcription factor BRI1-EMS-SUPPRESSOR 1(CmBES1)in chrysanthemum(C.morifolium cv.Jinba)is important for organ boundary formation because it represses organ boundary identity genes.Chrysanthemum plants overexpressing CmBES1 displayed increased fusion of the outermost ray florets due to the loss of differentiation of the two dorsal petals,which developed simultaneously with the ventral petals.RNA-seq analysis of the overexpression lines revealed potential genes and pathways involved in petal development,such as CUP-SHAPED COTYLEDON(CUC2),CYCLOIDEA 4(CYC4),genes encoding MADS-box transcription factors and homeodomain-leucine zippers(HD-Zips)and auxin pathway-related genes.This study characterizes the role of CmBES1 in ray floret development by its modulation of flower development and boundary identity genes in chrysanthemum. | Peilei Cheng Yanan Liu Yiman Yang Hong Chen Hua Cheng Qian Hu Zixin Zhang Jiaojiao Gao Jiaxin Zhang Lian Ding Weimin Fang Sumei Chen Fadi Chen Jiafu Jiang | 2020 | Horticulture Research2020，7，1： | 2 |
| 19 | Recombinant expression of different mutant K-ras gene in pancreatic cancer Bxpc-3 cells and its effects on chemotherapy sensitivity显示文摘K-ras is a member of ras gene family which is involved in cell survival,proliferation and differentiation.When a mutation occurs in ras gene,the activation of Ras proteins may be prolonged to induce oncogenesis.However,the relationship between K-ras mutation and clinical outcomes in pancreatic cancer patients treated with chemotherapy agents is still under debate.In this study,we constructed five pAcGFP1-C3 plasmids for different types of K-ras gene(WT,G12V,G12R,G12D,and G13D)and stably transfected human pancreatic cancer Bxpc-3 cells with these genes.The wild type and mutant clones showed a comparable growth and expression of K-Ras-GFP fusion protein.The expression of some K-ras mutations resulted in a reduced sensitivity to gefitinib,5-FU,docetaxel and gemcitabine,while showed no effects on erlotinib or cisplatin.Moreover,compared with the wild type clone,K-Ras downstream signals(phospho-Akt and/or phospho-Erk)were increased in K-ras mutant clones.Interestingly,different types of K-ras mutation had non-identical K-Ras downstream signal activities and drug responses.Our results are the first to reveal the relationship between different K-ras mutation and drug sensitivities of these anti-cancer drugs in pancreatic cancer cells in vitro. | SHAO TengFei ZHENG YuanTing ZHAO Bei LI Tao CHENG KeGuang CAI WeiMin | 2014 | Science China(Life Sciences)2014，57，10： | 2 |
| 20 | Effects of Ti and Cu on the Microstructure Evolution of AlCoCrFeNi High-Entropy Alloy During Heat Treatment显示文摘The microstructure evolution of AlCoCrFeNiTi0.5 alloy and AlCoCrFeNiCu alloy during heat treatment was systematically studied,to reveal the influence rules of chemical activity of adding element on the microstructure evolution of AlCoCrFeNi system.Owing to the negative mixing enthalpy with the constituent elements,Ti element was mainly dissolved in the Al-Nirich phases,and aggravated the lattice distortion of B2 phase.The structure variation of BCC phase by adding Ti inhibited the formation of FCC phase and enhanced the precipitation ofσphase during heat treatment.Owing to the positive mixing enthalpy with constituent elements,Cu element tended to be repelled to the ID region and formed metastable Cu-rich FCC1 phase which would transform into Cu-Al-Ni-rich FCC2 phase with increasing temperature.The addition of Cu inhibited the precipitation ofσphase during heat treatment.Adding Ti maintained the stable dendritic morphology,while adding Cu reduced the thermal stability of microstructure.Two dramatic morphology changes occurred at 1000℃and 1100℃in the AlCoCrFeNiCu alloy.The lattice distortion of phase in AlCoCrFeNiTi0.5 alloy was aggravated with increasing temperature up to 800℃,then relaxed together with the dissolution ofσphase when temperature was above 900℃.The variation in lattice distortion dominated the hardness of AlCoCrFeNiTi0.5 alloy.With increasing heating temperature,the increasing volume fraction of region with FCC structure due to the transformation between FCC phases,and the pronounced coarsening in microstructure due to the reduced thermal stability,resulted in the mainly decreasing trend in the hardness of AlCoCrFeNiCu alloy. | Yuan Yu Peiying Shi Kai Feng Jiongjie Liu Jun Cheng Zhuhui Qiao Jun Yang Jinshan Li Weimin Liu | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，8： | 2 |
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