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| 1 | Suppressing Effect of Heat Treatment on the Portevin–Le Chatelier Phenomenon of Mg–4%Li–6%Zn–1.2%Y Alloy显示文摘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 investigated.It 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 curves.Moreover,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 matrix.Since 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 eliminated.Meanwhile,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. | C.Q.Li D.K.Xu B.J.Wang L.Y.Sheng E.H.Han | 2016 | Journal of Materials Science & Technology2016，32，12： | 14 |
| 2 | Effects of annealing treatment on microstructure and tensile behavior of the Mg-Zn-Y-Nd alloy显示文摘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 properties.The 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 grain.Moreover,the as-extruded alloy shows strong{011^(-)0}fiber texture feature,especially for the large elongated grains.The annealing treatment results in static recrystallization,which increases fine equiaxed grains but decreases large elongated grains.In addition,the equiaxed grains formed during the annealing treatment demonstrate relative random orientations,which weaken the{011^(-)0}fiber texture of the alloy.Moreover,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 further.The 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 temperature.Such a variation can be ascribed to the evolution of texture,grain structure,twinning and precipitation during the annealing treatment. | 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 | 2020 | Journal of Magnesium and Alloys2020，8，3： | 10 |
| 3 | Effect of Icosahedral Phase on Crystallographic Texture and Mechanical Anisotropy of Mg–4%Li Based Alloys显示文摘Through investigating and comparing the microstructure and mechanical properties of the as-extruded Mg alloys Mg–4%Li and Mg–4%Li–6%Zn–1.2%Y(in wt%), it demonstrates that although the formation of I-phase(Mg_3Zn_6Y, icosahedral structure) could weaken the crystallographic texture and improve the mechanical 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–1.2%Y alloy, typical ductile fracture surfaces can be observed in both 'TD' and'ED' samples. Moreover, due to the zonal distribution of broken I-phase particles, the fracture surface of 'TD' samples is characterized by the typical 'woody fracture'. | C.Q.Li D.K.Xu S.Yu L.Y.Sheng E.H.Han | 2017 | Journal of Materials Science & Technology2017，33，5： | 9 |
| 4 | Microstructural characteristics and mechanical properties of the hot extruded Mg-Zn-Y-Nd alloys显示文摘A new type of Mg-Zn-Y-Nd alloy for degradable orthopedic implants was developed.In the present study,the Zn and Y content was adjusted and their influences on the microstructures and mechanical behaviors were discussed in depth.The 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 phases.The 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 decrease.The tensile and compressive properties are very little affected by Zn content because of the similar grain structure.As 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 twinning.The 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. | 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 | 2021 | Journal of Materials Science & Technology2021，，1： | 6 |
| 5 | Inhibiting effect of I-phase formation on the plastic instability of the duplex structured Mg-8Li-6Zn-1.2Y(in wt.%)alloy显示文摘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 compared.It revealed that the plastic instability of Mg-8%Li alloy was quite remarkable and the variation range of serrated flowing stress can reach5 MPa.For 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 degraded.The 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 strain.However,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 cracking.For 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 instability.Moreover,the plastic strain would preferentially concentrate at I-phase/β-Li interfaces and subsequently induced the cracking of I-phase. | B.J.Wang D.K.Xu X.Q.Zhuang L.Y.Sheng | 2023 | Journal of Magnesium and Alloys2023，11，6： | 0 |
| 6 | Relationship between the fatigue behavior and grain structures of an as-extruded Mg-6.2%Zn-0.6%Zr(in wt.%)alloy显示文摘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 structure.Among 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 MPa.Failure analysis demon-strated that for the fine grain structure,fatigue cracks preferentially nucleated at grain boundaries.For the“bi-modal”and coarse grain structures,the fatigue crack initiation was dominated by the cracking along slip bands. | B.J.Wang D.K.Xu C.L.Jiang L.Y.Sheng E.H.Han | 2023 | Journal of Materials Science & Technology2023，，18： | 0 |
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