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| 1 | Hot deformation behavior of Mg-7.22Gd-4.84Y-1.26Nd-0.58Zr magnesium alloy显示文摘The behavior evolvement of Mg-7.22Gd-4.84Y-1.26Nd-0.58Zr(GWN751K) magnesium alloy during the hot deformation process was discussed.The flow stress behavior of the magnesium alloy over the strain rate range of 0.002 to 2.000 s-1 and in the temperature range of 623 to 773 K was studied on a Gleeble-1500D hot simulator under the maximum deformation degree of 60%.The experimental results showed that the relationship between stress and strain was obviously affected by strain rate and deformation temperature.The flow stress of GWN751K magnesium alloy during high temperature deformation could be represented by the Zener-Hollomon parameter in the hyperbolic Arrhenius-type equation.The stress exponent n and deformation activation energy Q were evaluated by linear regression analysis.The stress exponent n was fitted to be 3.16.The hot deformation activation energy of the alloy during hot deformation was 230.03 kJ/mol.The microstructures of hot deformation were also influenced by strain rate and compression temperature strongly.It was found that the alloy could be extruded at 723 K with the mechanical properties of σ0.2 = 260 MPa,σb = 320 MPa,and δ = 18%. | ZHANG Kui MA Minglong LI Xinggang LI Yongjun LIANG Lichao BING Mengfen | 2011 | Rare Metals2011，30，1： | 13 |
| 2 | Microstructural evolution and mechanical properties of Mg-5Y-5Gd-xNd-0.5Zr magnesium alloys at different states显示文摘The microstructural evolution and mechanical properties of Mg-5Y-5Gd-xNd-0.5Zr magnesium alloys at different states were studied.The results reveal that island compounds at the grain boundaries of the as-cast alloys mainly were Mg24Y5,Mg41Nd5,and Mg5Gd phases.After homogenization at 808 K for 24 h,the distribution of the island compounds became discrete and Mg5Gd phases mostly decomposed and dissolved.With hot extrusion,the grain size was refined to about 20 μm on average,and both the strength and elongation were greatly improved.After ageing at 523 K for 5 h,the strength of different extruded alloys largely increased but the elongation decreased.With the increase of neodymium content,the strength of the alloys at different states increased.The content of neodymium element had an obvious effect on the elongation of the designed alloys.In the designed alloys,the Mg-5Y-5Gd-2.2Nd-0.5Zr alloy exhibited the best combination properties and its ultimate tensile strength,yield strength,and elongation could reach 380 MPa,285 MPa,and 9.0%,respectively. | LI Yongjun ZHANG Kui ZHANG Ya LI Xinggang MA Minglong | 2010 | Rare Metals2010，29，3： | 11 |
| 3 | Constitutive modeling of flow behavior and processing maps of Mg-8.1 Gd-4.5Y-0.3Zr alloy显示文摘High temperature deformation behavior and workability of Mg-8.1 Gd-4.5Y-0.3Zr alloy were studied by compression tests.Arrhenius equation with strain compensation and processing maps were established.The results show that the activation energy Q,structure factor a,n and In A varies with the strain,its relationship fit well by fifth order polynomial.The flow stresses predicted by the extracted model are in good agreement with the experimental results.There are five typical domains in the processing map,and the deformation mechanisms in different domains were determined by microstructure analysis.The feasible processing window of the alloy is in the areas of 400-500℃/0.001-0.1 s^(-1). | Xiangsheng Xia Kui Zhang Minglong Ma Ting Li | 2020 | Journal of Magnesium and Alloys2020，8，3： | 9 |
| 4 | Corrosion behavior of Mg-Y alloy in NaCl aqueous solution | Xin Zhang a,b,c,Kui Zhang a,Xia Deng a,Hongwei Li b,c,Yongjun Li a,Minglong Ma a,Ning Li b,c,Yanlong Wang b,c a State Key Laboratory for Fabrication and Processing of Nonferrous Metals,Beijing General Research Institute for Nonferrous Metals,Beijing 100088,China b Beijing Engineering Research Center for Advanced Manufacturing and Evaluation of Special Vehicle Parts,Beijing 100072,China c Center of Technology,Beijing North Vehicle Group Corporation,Beijing 100072,China | 2012 | Progress in Natural Science:Materials International2012，22，2： | 7 |
| 5 | Microstructures and strengthening mechanisms of Mg-8.2Gd-4.6Y-1.5Zn-0.4Zr alloy containing LPSO,β’ and γ type phases显示文摘The microstructures and strengthening mechanisms of the Mg-8.2 Gd-4.6 Y-1.5 Zn-0.4 Zr(wt%) alloy with long-period stacking ordered(LPSO),β’ and γ type phases were systematically studied.The results show that the LPSO with lamellar and block structures forms near the grain boundaries.The grains are clearly refined,and the 18 R LPSO phase is oriented along the extrusion direction after extrusion.Some particles also precipitate from the Mg matrix dynamically.The extruded alloy exhibits a remarkable agehardening response,and mechanical properties,with a tensile strength(TS) of 449 MPa,yield strength(YS) of 362 MPa,and elongation of 7.9% obtained in the peak-aged alloy.The strengthening mechanisms of the alloy in different states are discussed.Grain boundary and precipitation strengthening are the main strengthening mechanisms for the peak-aged alloy. | Xiangsheng Xia Kui Zhang Minglong Ma Ting Lie | 2020 | Journal of Rare Earths2020，38，10： | 5 |
| 6 | Anisotropy of the crystallographic orientation and corrosion performance of high-strength AZ80 Mg alloy显示文摘A high-strength AZ80 Mg alloy was prepared through multi-direction forging,thermal extrusion,and peak-aged heat treatment.The microstructure,crystallographic orientation and corrosion performance of extrusion-direction,transverse-direction,and normal-direction specimens were investigated using scanning electron microscopy,electron backscatter diffraction,and atomic force microscopy,respectively.Experimental results showed that crystallographic orientation significantly influenced the corrosion performance of AZ80 Mg alloy.Corrosion rates largely increased with decreased(0001)crystallographic plane intensity,whereas the(10−10)and(2−1−10)crystallographic plane intensities increased.This study showed that the corrosion rates of alloy can be modified to some extent by controlling texture,thereby promoting the applications of high-strength AZ80 Mg alloys in the aerospace and national-defense fields. | Quantong Jiang Xiumin Ma Kui Zhang Yantao Li Xinggang Li Yongjun Li Minglong Ma Baorong Hou | 2015 | Journal of Magnesium and Alloys2015，3，4： | 5 |
| 7 | Relationship between extrusion,Y and corrosion behavior of MgeY alloy in NaCl aqueous solution显示文摘The effect of hot extrusion and addition of Y element on the corrosion behavior of MgeY alloy was investigated by weight loss,immersion tests and potentiodynamic polarization measurements.The results showed that the grains became finer and uniform by increasing Y element,after extrusion.The corrosion resistance of MgeY alloy after extrusion was deteriorated with the addition of Y element and corrosion rates decreased in the following order:Mge13.78Y>Mge7.46Y>Mge5.23Y. | Kui Zhang Xin Zhang Xia Deng Xinggang Li Minglong Ma | 2013 | Journal of Magnesium and Alloys2013，1，2： | 4 |
| 8 | The corrosion behaviors of Mg-7Gd-5Y-1Nd-0.5Zr alloy under(NH4)_(2)SO_(4),NaCl and Ca(NO_(3))_(2)salts spray condition显示文摘The corrosion behaviors of Mg–7Gd–5Y–1Nd–0.5Zr alloys after T5 treatment under(NH4)_(2)SO_(4),NaCl and Ca(NO_(3))_(2)salt spray condition were investigated by weight loss rates,residual mechanical properties,scanning electron microscope(SEM),X-ray Diffraction(XRD)and potentiodynamic polarization tests.The corrosion degree of Mg–7Gd–5Y–1Nd–0.5Zr alloys in Ca(NO_(3))_(2)salt spray was very shallow by corrosion morphology and the corrosion route was extended along the surface in texture-like shape,while the alloy in NaCl and(NH4)_(2)SO_(4)salt spray were major local corrosion and there were serious corrosion pits on the surface.The weight loss rates in(NH4)_(2)SO_(4),NaCl and Ca(NO_(3))_(2)salt spray was respectively 0.4147,0.1618 and 0.0725 mg/(cm2 d−1).The results of residual mechanical properties indicated that the corrosion order in salts spray of Mg–7Gd–5Y–1Nd–0.5Zr alloys is NH4SO4>NaCl>Ca(NO_(3))_(2),which was consistent with the results of potentiodynamic polarization tests.The type of the salts will play a vital role in the initiation of the corrosion of EW75 alloy when they are used in the atmosphere environments.Inorganic salts with the smaller PH value after dissolution will have a stronger impact on the corrosion of EW75 magnesium alloys. | Quantong Jiang Kui Zhang Xinggang Li Yongjun Li Minglong Ma Guoliang Shi Jiawei Yuan | 2013 | Journal of Magnesium and Alloys2013，1，3： | 2 |
| 9 | Microstructure evolution,mechanical properties and creep mechanisms of Mg-12Gd-1MM-0.6Zr(wt%)magnesium alloy显示文摘In this research,the microstructure evolution,mechanical properties,and creep mechanisms of Mg-12 Gd-1 MM-0.6 Zr(wt%)alloy under different conditions were systematically studied using scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),and tensile creep tests.Regarding the microstructure of the as-cast sample,the average grain size is about 42μm,and the eutectic compounds were determined to be Mg_(5)(Gd_(0.8)MM_(0.2)).During homogenization,these eutectic compounds gradually dissolve,and Mg_(12)MM particles are precipitated.During hot extrusion,complete dynamic recrystallization(DRX)occurs,resulting in equiaxial grains with an average grain size of about 12μm and the formation of streamlines consisting of Mg_(12)MM particles along the extrusion direction(ED).After T5 treatment(225℃for 7 h),a large number ofβ'(Mg_(7)Gd)phases are precipitated on the{11-20}αhabit plane and are interconnected,forming an interlaced network structure.The ultimate tensile strength(R_(m)=405 MPa)and yield strength(R_(P0.2)=288 MPa)of the T5 sample are significantly higher than those of the as-extruded sample(R_(m)=289 MPa,R_(P0.2)=185 MPa),but the elongation(A=4%)was remarkably lower than that of the as-extruded sample(A=18%).When crept at225℃under 100 MPa,the steady-state creep rates of the as-cast,as-extruded,and T5 samples are1.59×10^(-8),1.08×10^(-8),and 1.40×10^(-8)s^(-1),respectively,and their total strains within 100 h are respectively breaking,0.81%,and 0.92%,indicating that the as-extruded alloy exhibits the best creep resistance.TEM analysis reveals that,during the creep process of the T5 sample,theβ'particles coarsen and the precipitate-free zones(PFZs)widen,which increase the steady-state creep rate and the total strain within 100 h as compared with the as-extruded sample. | Bibo Li Kui Zhang Guoliang Shi Kaikun Wang Yongjun Li Xinggang Li Minglong Ma Jiawei Yuan | 2021 | Journal of Rare Earths2021，39，5： | 2 |
| 10 | Hot deformation behavior and processing map of coarse-grained Mg–Gd–Y–Nd–Zr alloy显示文摘 | Xiangsheng Xia Qiang Chen Kui Zhang Zude Zhao Minglong Ma Xinggang Li Yongjun Li | 2013 | Materials Science & Engineering A2013，，： | 2 |
| 11 | Rapid and accurate detection of African swine fever virus by DNA endonuclease-targeted CRISPR trans reporter assay显示文摘The first case of African swine fever(ASF)outbreak in China was reported in a suburban pig farm in Shenyang in 2018.Since then,the rapid spread and extension of ASF has become the most serious threat fo r the swine industry.Therefore,rapid and accurate detection of African swine fever virus(ASFV)is essential to provide effective strategies to control the disease.In this study,we developed a rapid and accurate ASFV-detection method based on the DNA endonuclease-targeted CRISPR trans reporter(DETECTR)assay.By com bining recombinase polymerase am plification w ith CRISPR-Cas12a proteins,the DETECTR assay dem onstrated a m inim um detection lim it of eight copies with no cross reactivity with other swine viruses.Clinical blood samples were detected by DETECTR assay and showed 100%(30/30)agreement w ith real-tim e polymerase chain reaction assay.The rapid and accurate detection of ASFV may facilitate tim ely eradication measures and strict sanitary procedures to control and prevent the spread of ASF. | Zongjie Li Jianchao Wei Di Di Xin Wang Chenxi Li Beibei Li Yafeng Qiu Ke Liu Feng Gu Minglong Tong Shuiming Wang Xiaodong Wu Zhiyong Ma | 2020 | Acta Biochimica et Biophysica Sinica2020，52，12： | 2 |
| 12 | Dynamic precipitation during multi-axial forging of an Mg-7Gd-5Y-1Nd-0.5Zr alloy显示文摘The dynamic precipitation behavior during multi-axial forging in an Mg-7Gd-5Y-1Nd-0.5Zr alloy has been investigated and compared with that in static precipitation treatment. The results indicated that dynamic precipitation does occur during multi-axial forging. The dynamic precipitate can be deduced as β phase with face-centered cubic crystal structure (a = 2.22 nm). Most of the β precipitates locate at the dynamic recrystallization grain boundaries. The morphology and orientation relationship is different from that of the β phase formed in the static precipitation treated alloys, although the crystal structure is the same. The precipitation temperature of β phase during MAF is higher than that in the static precipitation treatment. | Ting Li Kui Zhang Xinggang Li Zhiwei Du Yongjun Li Minglong Ma Guoliang Shi | 2013 | Journal of Magnesium and Alloys2013，1，1： | 2 |
| 13 | Hot deformation behavior of rare earth magnesium alloy without pre-homogenization treatment显示文摘 | Ma Minglong Zhang Kui Li Xinggang | 2008 | Transactions of Nonferrous Metals Sot''iety of China2008，，： | 1 |
| 14 | Hot Deformation Behavior of AZ40 Magnesium Alloy at Elevated Temperatures显示文摘Hot compression tests on AZ40 magnesium alloy were conducted on a Gleeble 1500 d hot simulation testing machine in a deformation temperature range of 330 ℃-420 ℃ and a strain rate range of 0.002-2 s^(-1). Hot deformation behaviors were investigated on the basis of the analysis of the flow stressstrain curves, constitutive equation, and processing map. The stress exponent and apparent activation energy were calculated to be 5.821 and 173.96 k J/mol, respectively. Deformation twins and cracks located in grain boundaries were generated at 330 ℃ and 0.02 s^(-1), which are associated with a high strain rate and a limited number of available slip systems. With increasing temperature and decreasing strain rate, the twins disappeared and the degree of dynamic recrystallization increased. The alloy was completely dynamically recrystallized at 420 ℃ and 0.002 s^(-1), with a homogenous grain size of approximately 13.7 μm. The instability domains of the deformation behavior can be recognized by processing maps. By considering the processing maps and characterizing the microstructure, the optimum hot deformation parameters in this experiment were determined to be 420 ℃ and 0.002 s^(-1). | 赖林 张奎 MA Minglong LI Xinggang LI Yongjun SHI Guoliang YUAN Jiawei | 2017 | Journal of Wuhan University of Technology(Materials Science)2017，32，6： | 1 |
| 15 | Anisotropy of thermal conductivity and mechanical properties in Mg–5Zn–1Mn alloy显示文摘 | Jiawei Yuan Kui Zhang Ting Li Xinggang Li Yongjun Li Minglong Ma Ping Luo Guangqiu Luo Yonghui Hao | 2012 | Materials and Design2012，，： | 1 |
| 16 | Hot deformation behavior and finite element simulation of Mg-8.3Gd-4.4Y-1.5Zn-0.8Mn alloy显示文摘To study the hot deformation behavior of Mg-8.3 Gd-4.4 Y-1.5 Zn-0.8 Mn(wt%) alloy,hot compression tests were conducted using a Gleeble-3500 thermal simulator at temperatures ranging from 653 to773 K,true strain rates of 0.001-1 s^(-1),and a deformation degree of 60%.Results of hot compression experiments show that the flow stress of the alloy increases with the strain rate.The true stress-true strain curves are corrected by correcting the effect of temperature rise in the deformation process.Activation energy,Q,equal to 287380 J/mol and material constant,n,equal to 4.59 were calculated by fitting the true stress-true strain curves.Then,the constitutive equation was established and verified via finite element simulation.Results of the hot processing map show that the probability of material instability increases with the degree of deformation,which indicates that the material is not suitable for large deformation in a single pass.On the whole,the alloy is appropriate for multipass processing with small deformation and a suitable processing temperature and strain rate are 733 K and 0.01 s-1,respectively. | Jiabin Fan Minglong Ma Kui Zhang Yongjun Li Xinggang Li Guoliang Shi Jiawei Yuan | 2022 | Journal of Rare Earths2022，40，5： | 1 |
| 17 | Formation and growth of precipitates in a Mg-7Gd-5Y-1Nd-2Zn-0.5Zr alloy aged at 200℃显示文摘Crystal structures,growth characteristics,and transformation of the precipitates in a Mg-7Gd-5Y-1Nd-2Zn-0.5Zr(wt.%)alloy aged at 200℃for various durations were investigated using transmission electron microscopy(TEM)and high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM).A detailed Mg-Gd type precipitation sequence for Mg-Gd-Y-Nd-Zn alloys was proposed as follows:supersaturated solid solution→solute clusters→zigzag GP zones+β''(I)→β'→β'+protrusions/joints→pre-β_(1)→β_(1)→β.Solute clusters formed in the early stage of aging consisted of one or more rare-earth(RE)/Zn-rich atomic columns with different configura-tions.RE/Zn-rich solute clusters grew into zigzag GP zones andβ''(I)as aging time extending.The paired-zigzag GP zones might grow up to beβ'precipitates directly.In the peak-and plat-aging stages,the number of solute clusters in the matrix decreased until they disappeared,and most existed as zigzag arrays and super hexagons.Protrusions formed at the end ofβ'at an angle of 120°,then grew into joints when two differentβ'variants encountered together.Protrusions/joints comprise zigzag arrays,super-hexagons,β'F,β''(II),β_(T),and hybrid structures rich in solute atoms,and act as catalysts for the growth of theβ'variants.Largerβ'grow by joints consumption while smallerβ'precipitates dissolve to form joints.β_(1)precipitates essentially evolve from pre-β_(1)precipitates,with four-point diamond structures formed by RE/Zn atomic substitution and atomic migration based on the originalα-Mg structure. | Zhiwei Du Yonggang Peng Hang Teng Zhong Cao Kui Zhang Minglong Ma Xiaolei Han Ting Li Cong Che Yongjun Li | 2023 | Journal of Magnesium and Alloys2023，11，7： | 0 |
| 18 | Biodegradable metals for bone fracture repair in animal models: a systematic review显示文摘Biodegradable metals hold promises for bone fracture repair.Their clinical translation requires pre-clinical evaluations including animal studies,which demonstrate the safety and performance of such materials prior to clinical trials.This evidence-based study investigates and analyzes the performance of bone fractures repair as well as degr adation properties of biodegradable metals in animal models.Data were carefully collected after identification of population,interventions,com-parisons,outcomes and study design,as well as inclusion criteria combining biodegradable metals and animal study.Twelve publications on pure Mg,Mg alloys and Zn alloys were finally included and reviewed after extraction from a collected database of 2122 publications.Compared to controls of traditional non-degradable metals or resorbable polymers,biodegradable metals showed mixed or contradictory outcomes of fracture repair and degradation in animal models.Although quantita-tive meta-analysis cannot be conducted because of the data heterogeneity,this systematic review revealed that the quality of evidence for biodegradable metals to repair bone fractures in animal models is'very low'.Recommendations to standardize the animal studies of biodegradable metals were proposed.Evidence based biomaterials research could help to both identify reliable scientific evidence and ensure future clinical translation of biodegradable metals for bone fracture repair. | Jiazhen Zhang Zhizhong Shang Yanbiao Jiang Kui Zhang Xinggang Li Minglong Ma Yongjun Li Bin Ma | 2021 | Regenerative Biomaterials2021，8，1： | 0 |
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