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| 1 | What is going on in magnesium alloys?显示文摘China has been developed into one of the most active regions in terms of both fundamental and applied research on magnesium(Mg) and its alloys in the world from a solid base laid by its prominent metallurgist and materials scientists over the past decades. Nowadays, a large number of young-generation researchers have been inspired by their predecessors and become the key participants in the fields of Mg alloys, which consequently led to the establishment of China Youth Scholar Society for Magnesium Alloys Research in 2015. Since then, the first two China Youth Scholars Symposiums on Mg Alloys Research had been held at Harbin(2015) and Chongqing(2016) China, respectively. A number of crucial research interests related to fundamental and applied Mg research were discussed at the conferences and summarized in this short perspective, aiming to boost far-reaching initiatives for development of new Mg-based materials to satisfy the requirements for a broad range of industrial employments. Herein, four main aspects are included as follows: i) Plastic deformation mechanism and strengthening strategy, ii) Design and development of new Mg-based materials, iii) Key service properties, and iv) New processing technologies. | X.J. Wang D.K. Xu R.Z. Wu X.B. Chen Q.M. Peng L. Jin Y.C. Xin Z.Q. Zhang Y. Liu X.H. Chen G. Chen K.K. Deng H.Y. Wang | 2018 | Journal of Materials Science & Technology2018，34，2： | 35 |
| 2 | Layered Machinable and Electrically Conductive Ti_2AlC and Ti_3AlC_2 Ceramics:a Review显示文摘Ti2AlC and Ti3AlC2 are the most light-weight and oxidation resistant layered ternary carbides belonging to the MAX phases.This review highlights recent achievements on the processing,microstructure,physical,mechanical and chemical properties of these two machinable and electrically conductive carbides.Ti2AlC and Ti3AlC2 display superior properties such as fracture toughness,electrical and thermal conductivities,and oxidation resistance over their binary counterpart.This paper provides a comprehensive overview of the processing-microstructure-property correlations of these two carbides.Potential fields of applications for Ti2AlC and Ti3AlC2 are surveyed.In addition,we point out methods for further improving their properties in some specific applications through appropriate structural design and modification. | X.H. Wang Y.C. Zhou | 2010 | Journal of Materials Science & Technology2010，26，5： | 34 |
| 3 | PERSPECTIVES IN MECHANICS OF HETEROGENEOUS SOLIDS显示文摘The Microand Nano-mechanics Working Group of the Chinese Society of Theoretical and Applied Mechanics organized a forum to discuss the perspectives,trends,and directions in mechanics of heterogeneous materials in January 2010.The international journal,Acta Mechanica Solida Sinica,is devoted to all fields of solid mechanics and relevant disciplines in science,technology,and engineering,with a balanced coverage on analytical,experimental,numerical and applied investigations.On the occasion of the 30 th anniversary of Acta Mechanica Solida Sinica,its editor-in-chief,Professor Q.S.Zheng invited some of the forum participants to review the state-of-the-art of mechanics of heterogeneous solids,with a particular emphasis on the recent research development results of Chinese scientists.Their reviews are organized into five research areas as reported in different sections of this paper.§I firstly brings in focus on microand nano-mechanics,with regards to several selective topics,including multiscale coupled models and computational methods,nanocrystal superlattices,surface effects,micromechanical damage mechanics,and microstructural evolution of metals and shape memory alloys.§II shows discussions on multifield coupled mechanical phenomena,e.g.,multi-fields actuations of liquid crystal polymer networks,mechanical behavior of materials under radiations,and micromechanics of heterogeneous materials.In §III,we mainly address the multiscale mechanics of biological nanocomposites,biological adhesive surface mechanics,wetting and dewetting phenomena on microstructured solid surfaces.The phononic crystals and manipulation of elastic waves were elaborated in §IV.Finally,we conclude with a series of perspectives on solid mechanics.This review will set a primary goal of future science research and engineering application on solid mechanics with the effort of social and economic development. | C.Q. Chen J.Z. Cui H.L. Duan X.Q. Feng L.H. He G.K. Hu M.J. Huang Y.Z. Huo B.H. Ji B. Liu X.H. Peng H.J. Shi Q.P. Sun J.X. Wang Y.S. Wang H.P. Zhao Y.P. Zhao Q.S. Zheng W.N. Zou | 2011 | Acta Mechanica Solida Sinica2011，24，1： | 18 |
| 4 | THE IMPROVEMENT OF ELECTRON FIELD EMISSION FROM AMORPHOUS CARBON FILMS DUE TO HYDROGEN PLASMA CHEMICAL ANNEALING EFFECT显示文摘Hydrogenated amorphous carbon films were fabricated by using layer-by-layer deposition method and hydrogen dilution method in a small d.c.-assisted plasma enhanced chemical vapor deposition system. It was found that the hydrogen plasma treatment could change the sp2/sp3 ratio to some extent by chemical etching. The improvements of field emission characteristics were observed compared with that from conventionally deposited a-C films, which can be attributed to the large field enhancement effect due to the inhomogeneous distribution of nanometer scale sp2 clusters and the reduction of the surface emission barrier due to the hydrogen termination. | J. Xu, X.H. Huang, L. Wang, W. Li and K.J. Chen (National Laboratory of Solid State Microstructures and Departmeat of Physics, Nanjing University, Nanjing 210093, China) J.B. Xu (Department of Electronic Engineering, The Chinese University of Hong Kong, S | 2001 | Acta Metallurgica Sinica(English Letters)2001，14，6： | 15 |
| 5 | EXPERIMENTS AND SIMULATIONS OF A NEW DEVELOPED FORMING TECHNOLOGY-SHEAR-EXTRUSION PROCESS OF COMPONENTS WITH BRANCHES显示文摘Shear-extrusion process and its forming parumeters are proposed, whilst its laborsav- ing characteristic is utilized to forge large-size shutoff valve body on middle-due press. This new process is intended for the manufacture of large-size forged tubular components with branches on middle-due press. Experiments are carried out and processing parameters are obtained regarding the shear-extrusion process of a large-size shutoff valve body. Daformation and metal flow in the shear-extrusion process are inves- tigated. In orber to verify the laborsaving characteristic of this new process some contrastive experiments of extrusion force are performed between shear-extrusion and upsetting-extrusion for forming tubular components with branches. Based on rigid plastic FEM a plane-stain model is established to analyze shear-extrusion process of tubular components with branches. The analysis results by 2-dimensions PEM are comparatively quite well consistent with those of experiments. Both simulated and experimental results show that this new forming process is feasible for forging large-size tubular components with branches on middle-due press. | H.L. Yang, D.C. Kang, Z.L. Zhang, X.H. Piao and Z.D. Shi (National Die and Mold CAD Engineering Research Center, Shanghai Jiaotong University, Shanghai 200030, China) (School of Materials Sci. & Eng., Harbin Institute of Technology, Harbin 150001, China) | 2001 | Acta Metallurgica Sinica(English Letters)2001，14，3： | 6 |
| 6 | DEFORMATION BEHAVIOR OF AA6063 ALUMINIUM ALLOY AFTER REMOVING FRICTION EFFECT UNDER HOT WORKING CONDITIONS显示文摘The hot deformation behavior of AA6063 aluminium alloy has been investigated by means of compression tests at temperatures between 400 and 520℃, and strain rates ranging from 2.5 to 10 s-1. Owing to the barreling, the theoretical model on the basis of Hill s general method is used to calculate the flow stress of a cylindrical specimen under uniaxial simple compression so as to consider the friction effect at the die-specimen interface. A method of evaluating the friction coeffcient by combining compression tests with the finite element method is presented. The real flow behavior of AA6063 aluminium alloy can be described with sinh-Arrhenius equation. The hot deformation activation energy Q derived from the corrected stress and strain data is 232.350 kJ/mol. | Z. Y. Chen S. Q. Xu X.H. Dong | 2008 | Acta Metallurgica Sinica(English Letters)2008，21，6： | 6 |
| 7 | A study on centrifugal casting of high speed steel roll显示文摘High speed steel (HSS) rolls can replace traditional rolls such as alloyed cast iron rolls and powder metallurgical (PM) hard alloy rolls. The main reasons for the replacement are that the wear resistance of low-cost alloyed cast iron rolls is poor and the cost of high-quality PM hard alloy rolls is very high. By means of centrifugal casting, HSS rolls having excellent wear resistance have been manufactured. The hardness of the HSS roll is 6.5~67 HRC, the range of variation is smaller than 2 HRC and its impact toughness is 15 J/cm2. The wear rate of HSS rolls used in the pre-finishing stands of high-speed hot wire-rod rolling mill reaches 2.5×10-4mm per ton steel. Furthermore, the manufacturing cost of HSS rolls is significantly lower than that of PM hard alloy rolls; it is only 30 percent of that of PM hard alloy rolls. | ~*H. G. Fu~1, X.H. Zhang~2(1. Department of Mechanical engineering, Tsinghua University, Beijing 100084, P. R. China 2. Roll Made LTD. of Taiyuan Iron and Steel(Group)Company, Taiyuan 030003, Shanxi, P. R. China) | 2004 | China Foundry2004，1，S1： | 6 |
| 8 | Microstructural evolution of aluminum alloy during friction stir welding under different tool rotation rates and cooling conditions显示文摘The microstructural evolution during friction stir welding(FSW) has long been studied only using one single welding parameter. Conclusions were usually made based on the final microstructure observation and hence were one-sided. In this study, we used the 'take-action' technique to freeze the microstructure of an Al-Mg-Si alloy during FSW, and then systematically investigated the microstructures along the material flow path under different tool rotation rates and cooling conditions. A universal characteristic of the microstructural evolution including four stages was identified, i.e. dynamic recovery(DRV), dislocation multiplication, new grain formation and grain growth. However, the dynamic recrystallization(DRX)mechanisms in FSW depended on the welding condition. For the air cooling condition, the DRX mechanisms were related to continuous DRX associated with subgrain rotation and geometric DRX at high and low rotation rates, respectively. Under the water cooling condition, we found a new DRX mechanism associated with the progressive lattice rotation resulting from the pinning of the second-phase particles.Based on the analyses of the influencing factors of grain refinement, it was clearly demonstrated that the delay of DRV and DRX was the efficient method to refine the grains during FSW. Besides, ultra-high strain rate and a short duration at high temperatures were the key factors to produce an ultrafine-grained material. | X.H. Zeng P. Xue L.H. Wu D.R. Ni B.L. Xiao K.S. Wang Z.Y. Ma | 2019 | Journal of Materials Science & Technology2019，35，6： | 6 |
| 9 | 骨形成蛋白对小鼠造血型急性放射损伤治疗作用的研究显示文摘小鼠经60 Coγ射线 6 .5 - 7.5Gy照射后 ,分别于肌袋内植入纯化牛BMP ,或腹腔内注入可溶性rhBMP - 2m ,或移植Pbk -hBMP - 2 /NIH3T3入腹腔内 ,观察动物的 30d活存情况 ,并检测几种造血参数。结果表明 ,pbBMP(纯化牛骨形成蛋白 )、hBMP - 2m (重组骨形成蛋白 - 2多肽 )Pbk -BMP - 2 /NIH3T3cellline(PBKhBMP - 2转基因细胞株 )对小鼠 6 .5、7.0、7.5Gyγ射线照射后急性放射造血损伤有治疗作用 :GM -CFU集落形成率、各项造血参数和 30d活存率均较对照组有显著性差异 (p <0 .0 1)。本工作结果提示 ,BMP对成年动物放射所致造血损伤具有治疗作用 ,其机理与促进已损伤的造血功能的修复作用有关。 | 田琼 张绍章 蒲勤 张发科 Hannah X.H. | 2001 | 辐射研究与辐射工艺学报2001，19，3： | 6 |
| 10 | ALLOYING EFFECT OF Ni AND Cr ON THE WETTABILITY OF COPPER ON W SUBSTRATE显示文摘由无柄的落下技术,有 Ni 和 Cr 的增加的 Cu/W 系统的 wettability 在真空空气下面被学习了。wettability 和 W 底层上的铜的弄湿的机制上的 Ni 和 Cr 内容和弄湿的温度的效果详细被调查了。结果证明 W 底层上的 Cu 的弄湿的角度随 Ni 或 Cr 的内容的增加被减少,并且也与提起弄湿的温度减少。SEM, EPMA,和 X 光检查衍射被用来分析 CuNi/W 和 CuCr/W 系统的不同种族的特征。结果表明关于在 Cu-4.0 wt 宠物 Ni/W,金属间化合的阶段 Ni4W 在被猛抛的接口的 2-3 m 有转变层。至于 CuCr/W 系统,没有反应发生在接口。二个因素是 Cr 和 Ni 和渗入温度的内容必须适当地被选择以便控制界面的溶解和反应 Cu-W 合金什么时候被渗入方法准备。 | X.H. Yang P. Xiao S.H. Liang J.T. Zou Z.K. Fan | 2008 | Acta Metallurgica Sinica(English Letters)2008，21，5： | 5 |
| 11 | SIMULATION OF THE TWIN ROLL STAINLESS STRIP CASTING PROCESS显示文摘The position of the solidification completed temperature of twin roll stainless strip casting process is very important to the quality of the casting strip. In order to control this position, the .solidification completed temperature should be known at first. The present paper first. simulated dendritic microsegregation under conditions of twin roll stainless strip casting, and got the relationship between the temperature and solid fraction of the mush zone. The temperatures such as ZDT (equal to the solidifica- tion completed temperature and LIT (liquid impenetrable temperature), et al., also were obtained. Then by using the turbulent model, the flow and thermal fields of the pool of the twin roll stainless strip casting, and the speed and temperature fields oj different casting speeds were given cud also explained. The results are coincident with the experimental result. Combined with the results of these two simulations, the appropriated casting speed was found. | Y.C. Miao, X.M. Zhang, G.D. Wang, H.S. Di and X.H. Liu (State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, China) | 2001 | Acta Metallurgica Sinica(English Letters)2001，14，3： | 4 |
| 12 | INFLUENCE OF COLD ROLLING TECHNOLOGY ON TEXTURE EVOLUTION OF IF STEEL显示文摘Two kinds of cold rolling experiments, single cold rolling and double cold rolling, were carried out on one titanium stabilized interstitial free (IF) steel that has been warm rolled at ferrite temperature. The main aim was to investigate the evolution of rolling and annealing textures from the well known behavior observed under single cold rolling condition to the less understood double cold rolling by using orientation distribution function (ODF). In the twice cold rolled samples, the annealing texture comprises only single {111}(110-112) r-fibre texture when it subjected to moderate reduction in the first round of rolling. Accordingly both the once cold rolled sample and the twice cold rolled sample with heavy reduction in the first round of rolling have much complex texture components. They are related to the formation of initial {111} subgrain and the priority growth of stable {111} nucleus. | J.X. Li, X.H. Liu and G.D. WangState Key Laboratory of Rolling & Automation, Northeastern University, Shenyang 110006, China Manuscript received 16 July 2001 in revised form 6 September 2001 | 2002 | Acta Metallurgica Sinica(English Letters)2002，15，3： | 3 |
| 13 | Color image segmentation: advances and prospects显示文摘 | H.D. Cheng X.H. Jiang Y. Sun Jingli Wang | 2001 | Pattern Recognition2001，，12： | 3 |
| 14 | Morphology Control and Optical Absorption Properties of Ag Nanoparticles by Ion Implantation显示文摘Ion implantation is a powerful method for fabricating nanoparticles in dielectric.For the actual application of nanoparticle composites,a careful control of nanoparticles has to be achieved.In this letter,the size,distribution and morphology of Ag nanoparticles are controlled by controlling the ion current density,ion implantation sequence and ion irradiation dose.Single layer Ag nanoparticles are formed by Ag+ion implantation at current density of 2.5μA/cm2.By Ag and Cu ions sequential implantation,the size of single layer Ag nanoparticles increases.While,by Cu and Ag ions sequential implantation,uniform Ag nanoparticles with wide distribution are formed.The morphology of Ag nanoparticles changes to hollow and sandwiched nanoparticles by Cu+ion irradiation to doses of 3×1016 and 5×1016 ions/cm2.The optical absorption properties of Ag nanoparticles are also tailored by these ways. | G.X. Cai F. Ren X.H. Xiao L.X. Fan X.D. Zhou C.Z. Jiang | 2009 | Journal of Materials Science & Technology2009，25，5： | 3 |
| 15 | APPLICATION OF UNIFORM PRECRIPTION DESIGN IN STUDYING OF WEARREISTANT COATING IN PLASMA SPRAYING显示文摘Plasma spraying technics, a method of strengthening surfaces, shows advantages in wear-resistant, reducing friction, bearing corrosion and enduring higher temperature. While for the coating material, it is important to improve the ability of the functional coating. In this paper, a coating material of wear-resistant, bearing corrosion and enduring higher temperature in middle and low speed diesel is studied quantificationally with a uniform prescription design method, which reduced the test period as the test points distribute uniformly. An optimized combination is put forward of each part in the coating and a method to develop a new coating material is supplied. | S.C. Fan 1) , X.H. Wang 2) , J.J. Zhang 2) and J.M. Wan 2) 1)School of Mechanical Engineering, Tianjin University, Tianjin 300070, China 2)School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，5： | 3 |
| 16 | Strengthening and toughening mechanisms in Mg–Zn–Y alloy with a long period stacking ordered structure显示文摘 | X.H. Shao Z.Q. Yang X.L. Ma | 2010 | Acta Materialia2010，，14： | 3 |
| 17 | Effects of Delayed Second Cochlear Implant显示文摘Objective Since Helms' successful bilateral cochlear implantation with good results in 1996, there have been increasing number of reports on bilateral cochlear implantation. Most second device have been implantated within one year after the first. Considering effects of long time auditory deprivation, it is not clear whether a delayed second cochlear implant serves to add additional benefits and how it may interact with central nervous system plasticity. Methods Three cases who received delayed second cochlear implants at People's Hospital of Peking University from 2002 to 2005 were reviewed. The interval between the first and second implants was longer than 2 years in all three patients. Sound perception, and unilateral/bilateral speech discrimination in quiet and noise were evaluated. In addition, GAP detection test was conducted in one patient. Results In one case, having both implants on provided improved performance compared to using only one implant both in quiet and noise. Presumably due to visual interference from lip-reading or short interval between second implant and testing, one patient showed no improvement from using the second implant either in quiet or noise, while the last case demonstrated additional benefits from the second implant only in quiet. In all three patients, performance in recognizing the four tones in Mandarin was superior over word recognition. Conclusions Considerable plasticity in the cerebral auditory center is preserved, despite long acoustic deprivation in some children who have received unilateral cochlear implant. Delayed second implants can result in significant improvements in some of these children. Visual interference from lip-reading may be an obstacle during retraining. The better recognition of tones in the Mandarin language may represent a different sound discrimination mechanism in the auditory system, although it may also be related to the signal processing mechanisms of the implant used (MED-EL COMBI 40+). | XIA Rui-ming1, WU Xi-hong2, JANG Zi-gang1, JING Yuan-yuan1, LIN Yun-juan1, YU Li-sheng1 1. Department of Otolaryngology, People’s Hospital, Peking University, P. R. China 11, Xizhimen South St, 100044 Beijing, P.R. China 2. Speech and Hearing Research Center, Peking University, China R.M. Xia, X.H. Wu, Z.G. Jang, Y.Y. Jing, Y.J. Lin, L.S.Yu | 2006 | Journal of Otology2006，1，2： | 2 |
| 18 | Modeling periodic adiabatic shear band evolution during high speed machining Ti-6Al-4V alloy显示文摘 | G.G. Ye S.F. Xue M.Q. Jiang X.H. Tong L.H. Dai | 2013 | International Journal of Plasticity2013，，： | 2 |
| 19 | INFLUENCING FACTORS FOR OBTAINING ULTRAFINE AUSTENITE GRAINS WITH INITIAL MICROSTRUCTURE OF WARM-ROLLED FERRITE/PEARLITE显示文摘Three warm-rolled ferrite/pearlite microstructures were prepared by rolling at 500℃, and the austenitizing characteristics were discussed in conjunction with deformation during the heating stage. The results indicated that the final austenite grain size was sensitive to the deformation direction of the initial warm-rolled microstructure. The transient microstructure at a given temperature was the most important influencing factor on the austenitizing characteristic combined with deformation. Moreover, the hot-rolled microstructure also had to be prepared in an optimal state because of its direct effect on the warm-rolled microstructure. | S.J. Yao L.X. Du X.H. Liu G.D. Wang | 2008 | Acta Metallurgica Sinica(English Letters)2008，21，6： | 2 |
| 20 | Energy efficiency and economic feasibility of CCHP driven by stirling engine显示文摘 | X.Q. Kong R.Z. Wang X.H. Huang | 2003 | Energy Conversion and Management2003，，9： | 2 |
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