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Journal of Magnesium and Alloys 2023年第6期11卷 2196-2204页

作者： B.J.Wang D.K.Xu X.Q.Zhuang l.y.sheng School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159China Key laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Peking University Shenzhen InstituteShenzhen Key Lab Human Tissue Regenerate&RepairShenzhen 518057China

In this work,the tensile behaviors of Mg-8%li and Mg-8%li-6%Zn-1.2%y alloys at ambient temperature were investigated and *** revealed that the plastic instability of Mg-8%li alloy was quite remarkable and the variation range of serrated flowing stress can reach5 *** the Mg-8%li-6%Zn-1.2%y alloy,the formation of I-phase(Mg_(3)Zn_(6)y)can simultaneously enhance the tensile strength and eliminate the plastic instability phenomenon,whilst its ductility was *** in-situ tensile tests revealed that for the Mg-8%li alloy,the severity and number of slip traces present in bothα-Mg andβ-li matrix phases increased remarkably with the applied tensile ***,slip traces were quite fine inβ-li matrix phase and could be clearly observed when the applied tensile strain exceeded 18%.Due to the incompatibility of plastic deformation occurred in two matrix phases,the induced strain concentration atα-Mg/β-li interfaces caused their subsequent *** the Mg-8%-6%Zn-1.2%y alloy,the I-phase distributed atα-Mg/β-li interfaces suppressed the plastic deformation ofα-Mg matrix phase and the tensile strain was dominated by theβ-li matrix phase,resulting in the disappearance of plastic ***,the plastic strain would preferentially concentrate at I-phase/β-li interfaces and subsequently induced the cracking of I-phase.

关键词： Mg-li alloys Microstructure Plastic deformation Basal slip Cracking

Effect of rolling ratios on the microstructural evolution and corrosion performance of an as-rolled Mg-8wt.%li alloy

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Journal of Magnesium and Alloys 2021年第2期9卷 560-568页

作者： B.J.Wang D.K.Xu X.Cai y.X.Qiao l.y.sheng School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159China Key laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiangChina Peking University Shenzhen InstituteShenzhen Key Lab Human Tissue Regenerate&RepairShenzhen 518057China

In this work,the influence of rolling ratios on microstructural changes and corrosion behavior of an as-rolled Mg-8 wt.%li alloy in0.1 mol/l Na Cl solution has been *** revealed that with the rolling ratio being increased from 3 to 10,theα-Mg phases were elongated and fragmented,whilst the area fraction of exposedβ-li phases ***,the corrosion performance of the alloy decreased with the increased rolling *** all the samples,their corrosion processes were quite similar and can have two *** the initial stage with the samples being immersed for less than 6 h,the corrosion mainly occurred inβ-li *** the samples were immersed for longer than 6 h,the corrosion attack transferred toα-Mg phases and the hydrogen evolution rate was accelerated.

关键词： Mg-li alloys Wrought Microstructure Corrosion performance

Relationship between the fatigue behavior and grain structures of an as-extruded Mg-6.2%Zn-0.6%Zr(in wt.%)alloy

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Journal of Materials Science & Technology 2023年第18期149卷 119-126页

作者： B.J.Wang D.K.Xu C.l.Jiang l.y.sheng E.H.Han School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang 110159China Key laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Binzhou Institute of Technology Binzhou 256606China Shandong Key laboratory of Advanced Aluminium Materials and Technology Binzhou 256606China Shenzhen Institute Shenzhen Key Lab Human Tissue Regenerate&RepairPeking UniversityShenzhen 518057China

Through investigating the tension-tension fatigue behavior of an as-extruded Mg-6.2 wt.%Zn-0.6 wt.%Zr(ZK60)alloy,it revealed that the determined fatigue strength at 107 cycles was quite sensitive to the grain *** them,the fine grain structure had the highest fatigue strength of 130 MPa,whereas the typical“bi-modal”grain structure had the lowest fatigue strength of 110 *** analysis demon-strated that for the fine grain structure,fatigue cracks preferentially nucleated at grain *** the“bi-modal”and coarse grain structures,the fatigue crack initiation was dominated by the cracking along slip bands.

关键词： Mg alloys Grain structure Cyclic slips Fatigue behavior Crack initiation

Effect of Icosahedral Phase on Crystallographic Texture and Mechanical Anisotropy of Mg–4%li Based Alloys

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Journal of Materials Science & Technology 2017年第5期33卷 475-480页

作者： C.Q.li D.K.Xu S.yu l.y.sheng E.H.Han School of Materials Science and Engineering Northeastern University CAS Key laboratory of Nuclear Materials and Safety Assessment Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering Shenyang Aerospace University Shenzhen Institute Peking University Shenzhen Key Lab Human Tissue Regenerate & Repair

Through investigating and comparing the microstructure and mechanical properties of the as-extruded Mg alloys Mg-4%li and Mg-4%li-6%Zn-l.2%y （in wt%）, it demonstrates that although the formation of I-phase （Mg3Zn6y, icosahedral structure） could weaken the crystallographic texture and improve the me- chanical strength, the mechanical anisotropy in terms of strength remains in Mg-4%li-6%Zn-1.2%y alloy. Failure analysis indicates that for the Mg-4%li alloy, the fracture surfaces of the tensile samples tested along transverse direction （TD） contain a large number of plastic dimples, whereas the fracture surface exhibits quasi-cleavage characteristic when tensile samples were tested along extrusion direction （ED）. For the Mg-4%li-6%Zn-I.2%y alloy, typical ductile fracture surfaces can be observed in both ＂TD＂ and ＂ED＂ samples. Moreover, due to the zonal distribution of broken l-phase particles, the fracture surface of ＂TD＂ samples is characterized by the typical ＂woody fracture＂.

关键词： Mg-li alloy Texture Mechanical anisotropy Fracture

Suppressing Effect of Heat Treatment on the Portevin–le Chatelier Phenomenon of Mg–4%li–6%Zn–1.2%y Alloy

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Journal of Materials Science & Technology 2016年第12期32卷 1232-1238页

作者： C.Q.li D.K.Xu B.J.Wang l.y.sheng E.H.Han School of Materials Science and Engineering Northeastern University Shenyang 110819 China Key laboratory of Nuclear Materials and Safety Assessment Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Environmental Corrosion Center Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Shenzhen Institute Shenzhen Key Lab Human Tissue Regenerate and Repair Peking University Shenzhen 518057 China

Microstructural evolution and Portevin-le Chatelier（PlC） phenomenon of the as-extruded Mg-4%li-6%Zn-1.2%y alloy before and after heat treatment have been *** has been demonstrated that for the as-extruded and solid solution treated（T4） samples,the PlC phenomenon could be obviously observed on tensile stress-strain ***,the PlC phenomenon in T4 samples was more salient than that in the as-extruded condition,suggesting that the occurrence of PlC phenomenon was closely related to the super-saturation degree of solute atoms in the *** most of solute atoms were consumed for the formation of Mg Zn precipitates（β1′ and a little of β2′） during the subsequent ageing treatment（T6）,the PlC phenomenon of T6 samples was ***,due to the pinning effect of the formed Mg Zn precipitates on mobile dislocations,the tensile strength of T6 samples was relatively higher than those of the other two conditions.

关键词： Mg-li alloy Heat treatment Portevin-le Chatelier (PlC) effect Precipitates

Microstructural characteristics and mechanical properties of the hot extruded Mg-Zn-y-Nd alloys

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Journal of Materials Science & Technology 2021年第1期60卷 44-55页

作者： B.N.Du Z.y.Hu l.y.sheng D.K.Xu y.X.Qiao B.J.Wang J.Wang y.F.Zheng T.F.Xi Shenzhen Institute Peking UniversityShenzhen 518057China Key laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Jiangsu University of Science and Technology Zhenjiang 212003China Shenzhen yezhan Electronics Co. LtdShenzhen 518110China

A new type of Mg-Zn-y-Nd alloy for degradable orthopedic implants was *** the present study,the Zn and y content was adjusted and their influences on the microstructures and mechanical behaviors were discussed in *** results showed that the as-extruded Mg-Zn-y-Nd alloys are mainly composed of fine dynamic recrystallized grains(DRXed grains),la rge unDRXed grains and linearly distributed secondary *** cha nge of Zn content exerts little influence on the grain structure of the extruded Mg-Zn-y-Nd alloy,while the increase of y content would hinder the dynamic recrystallization process and the growth of the DRXed grains,thus the size and volume fraction of the equiaxed DRXed grains *** tensile and compressive properties are very little affected by Zn content because of the similar grain *** y content increases,the tensile yield strength(TyS) and ultimate strength(TUS) increase while the elongation decreases,this is caused by a combined strengthening effect of grain refinement,texture,precipitation and *** compressive yield strength(CyS) and ultimate strength(CUS) of Mg-Zn-y-Nd alloy with diffe rent y content exhibit a similar tendency as the tensile test.

关键词： Mg-Zn-y-Nd alloy Microstructure Tensile properties Compressive properties Basal texture Twin

Effects of annealing treatment on microstructure and tensile behavior of the Mg-Zn-y-Nd alloy

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Journal of Magnesium and Alloys 2020年第3期8卷 601-613页

作者： l.y.sheng B.N.Du Z.y.Hu y.X.Qiao Z.P.Xiao B.J.Wang D.K.Xu y.F.Zheng T.F.Xi Shenzhen Institute Peking UniversityShenzhen 518057China Jiangsu University of Science and Technology Zhenjiang 212003China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China dShenzhen yezhan Electronics Co. LtdShenzhen 518110China

In the present study,the Mg-4Zn-0.6y-0.5Nd alloy was hot extruded and annealed at 200℃,225℃ and 250℃ for different time to optimize microstructure and mechanical *** results exhibit that the dual-size grain structure and linearly distributed secondary phase are the main feature of the as-extruded Mg-Zn-y-Nd alloy,which can be described as the elongated grain is surrounded by the fine equiaxed ***,the as-extruded alloy shows strong{011^(-)0}fiber texture feature,especially for the large elongated *** annealing treatment results in static recrystallization,which increases fine equiaxed grains but decreases large elongated *** addition,the equiaxed grains formed during the annealing treatment demonstrate relative random orientations,which weaken the{011^(-)0}fiber texture of the ***,during the annealing at 225℃and 250℃,the extension twins begin to form in the alloy and weaken the{011^(-)0}fiber texture of the alloy *** annealing treatment has little influence on the linearly distributed secondary phase but promotes the coarsening of small precipitates at 250℃.The annealing treatment could increase the yield and ultimate strength,but the elongation decreases,especially at higher *** a variation can be ascribed to the evolution of texture,grain structure,twinning and precipitation during the annealing treatment.

关键词： Annealing treatment Mg-Zn-y-Nd alloy Microstructure Tensile property

Investigation on B, Cr Doped Ni3Al Alloy Prepared by Self- Propagation High-temperature Synthesis and Hot Extrusion

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Investigation on B, Cr Doped Ni3Al Alloy Prepared by Self- P...

Deformation mechanism of fine grained Mg-7Gd-5y-l.2Nd-0.5Zr alloy under high temperature and high strain rates

中国材料大会2012

作者： l.y.sheng J.T.Guo C.yuan F.yang G.S.li T.F.Xi Shenzhen Institute Peking University College of Engineering Peking University Shenzhen Airlines Shenzhen Bao’an International Airport Institute of Metal Research Chinese Academy of Sciences

ISBN: (纸本)9783037856086;3037856084

The Ni3Al and Ni3Al-B-Cr alloys were fabricated by the self-propagation high-temperature synthesis with hot extrusion method. Their microstructure and mechanical properties were studied by using combination of X-ray diffraction, optical microscopy, transmission electron microscopy and compression test. Analysis of X-ray spectra exhibited that the elemental powders had been transformed to the Ni3Al phase after the self-propagation high-temperature synthesis processing. Microstructure examination showed that the alloy without extrusion consisted of coarse and fine grains, but the subsequent hot extrusion procedure homogenized the grain size and densified the alloy obviously. Transmission electron microscopy observations on the Ni3Al alloy revealed that Ni3Al, γ-Ni and Al2O3 particles were the main phases. When the boron and chromium were added, besides the β-NiAl phase, α-Cr phase and some Cr7Ni3 particles with stacking faults inside were observed. In addition, a lot of substructure and high-density dislocation arrays were observed in the extruded part, which indicated that the subsequent extrusion had led to great deformation and partly recrystallizing in the alloy. Moreover, the subsequent extrusion procedure redistributed the Al2O3 particles and eliminated the γ-Ni. These changes were helpful to refine the microstructure and weaken the misorientation. The mechanical test showed that the self-propagation high-temperature synthesis with hot extrusion improved the mechanical properties of the Ni3Al alloy significantly. The addition of B and Cr in Ni3Al alloy increased the mechanical properties further, but the compressive strength of the alloy was still lower than that synthesized by combustion. Finally, the self-propagation high-temperature synthesis with hot extrusion was a good method to prepare Ni3Al alloy from powder.

关键词： Ni3Al Self-propagation high-temperature synthesis Extrusion Microstructure Mechanical properties

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Journal of Magnesium and Alloys 2020年第4期8卷 1144-1153页

作者： Wanru Tang Zheng liu Shimeng liu le Zhou Pingli Mao Hui Guo Xiaofang sheng School of Materials Science and Engineering Shenyang University of Technology110870China Key laboratory of Magnesium Alloys and the Processing technology of liaoning Province 110870China Wanfeng Auto Holding Group Shaoxing312500China

Fine grained Mg-7Gd-5y-1.2Nd-0.5Zr alloy was investigated by dynamic compression tests using a Split Hopkinson Pressure Bar under the strain rates in the range 1000-2000 s^(-1) and the temperature range 293-573 K along the normal *** microstructure was measured by optical microscopy,electron back-scattering diffraction,transmission electron microscopy and X-ray *** results showed that Mg-7Gd-5y-1.2Nd-0.5Zr alloy had the positive strain rate strengthening effect and thermal softening effect at high *** solid solution of Gd and y atoms in Mg-7Gd-5y-1.2Nd-0.5Zr alloy reduced the asymmetry of α-Mg crystals and changed the critical shear stress of various deformation *** main deformation mechanisms were prismatic slip and pyramidal(a)slip,{102}tension twinning,and dynamic recrystallization caused by local deformation such as particle-stimulated nucleation.c 2020 Published by Elsevier *** behalf of Chongqing University.

关键词： Mg-7Gd-5y-1.2Nd-0.5Zr magnesium alloy High strain rate deformation local deformation mechanism

Discovery of new MAX-phase-like layered ternary carbide V_(8)P_(6)C:Crystal structure,thermal expansion,and elastic properties

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Journal of Materials Science & Technology 2024年第7期174卷 55-62页

作者： H.X.Chen l.sheng Z.l.Zhang X.C.Wen D.l.yang X.y.ye P.Q.Dai School of Materials Science and Engineering Fujian University of TechnologyFuzhou 350118China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of ScienceBeijing 100049China Fujian Provincial Key laboratory of Advanced Materials Processing and Application Fuzhou 350118China State Key laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Due to the laminated structure,MAX phases and MAX-phase-like compounds possess outstanding dam-age tolerance capability with good thermal/electrical conductivity and other charming functional prop-erties,showing a bright future for structural-functional ***,a new MAX-phase-like ternary car-bide V_(8)P_(6)C with layered characteristics was *** to the alternate stacking of hexagonal-arranged M/A/X atom layers in MAX phases,V_(8)P_(6)C has a layered structure formed by a repeated stacking of the slabs consisting of V_(6)C-octahedrons and VP 6-distorted-octahedrons in three-atomic layers *** thermal expansion anisotropy was revealed,with the thermal expansion coefficients(TECs)along a-axis,c-axis,and the average value,equal toα_(a)=8.55(5)μK^(−1),α_(c)=10.23(5)μK^(−1),andα_(l)=9.14(5)μK^(−1),*** dilation along the c-axis was mainly dominated by out-plane V-P bonds be-tween layered *** to the pressure-dependent lattice parameters,the polycrystalline bulk modulus(B_(0)=185(9)GPa)and high compressibility anisotropy factor(B_(a)/B_(c)=1.64)was ***-while,the second-order elastic constants were calculated,and the elastic moduli,E=303 GPa,B=198 GPa,G=122 GPa,andν=0.246,were *** the weak connection between layer slabs by out-plane V1-P bond was revealed by the bond stiffness model,with a bond stiffness close to the M-A bond in MAX ***,good damage tolerance capability was predicted according to Paugh’s ratio(G/B=0.616)and Cauchy pressure(P_(a)=0 GPa,P_(c)=-7.5 GPa),even better than those of typical MAX *** discovery of V_(8)P_(6)C provides a new member of MAX-phase-like damage-tolerant ceramic with relatively low density,moderate thermal expansion,and anisotropic compressibility,and the unique lay-ered structure is inspiring for exploring new layered ternary ceramics.

关键词： New ternary carbide MAX phase Thermal expansion Elastic constants Anisotropy