首页|Achieving exceptional strength and ductility combination in a heterostructured Mg-Y alloy with densely refined twins
Achieving exceptional strength and ductility combination in a heterostructured Mg-Y alloy with densely refined twins
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
NSTL
万方数据
Metals and alloys with heterogeneous microstructures are an emerging class of materials that exhibit exceptional mechanical properties,owing to the novel scientific principle of hetero-deformation induced(HD1)strengthening and hardening.For magnesium alloys,due to their low recrystallization tempera-ture,poor ductility at room temperature,limited cold workability,and the tendency to generate strong basal texture during deformation,it is difficult to obtain heterostructures without relying on precipitation of the second phases.Here,three heterostructured Mg-2.9Y(wt.％)materials with varying accumulative equivalent true strains,i.e.,5％-5 cycles,7.5％-5 cycles,and 10％-5 cycles materials were fabricated via applying five complete triaxial compression cycles to the bulk alloy.The 5％-5 cycles material with an ac-cumulative equivalent true strain of 0.37 is featured with long twin lamellae embedded in coarse grains.When the accumulative true strain increases to 0.72,a heterogeneous structure composed of long and short twin lamellae is formed inside the 7.5％-5 cycles material.As the equivalent true strain further in-creases to 1.01,the 10％-5 cycles material exhibits a mixed structure with densely refined twin lamellae embedded in the coarse-grained matrix.The room-temperature uniaxial tensile tests show that the yield strength of the materials processed by triaxial cyclic compression(TCC)has been significantly improved compared to that at the initial state,whereas ductility was not significantly sacrificed without the sub-sequent heat treatment.The dense and refined twin lamellae that serve as hard domains in this material provide a high density of interfaces and impede dislocation motion effectively.This results in significant HDI strengthening and hardening.These findings provide new insight into the design of heterostructured hexagonal close-packed materials with both high strength and good ductility.
HeterostructureMagnesium alloyTwinHetero-deformation induced strengthening and hardening
Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,School of Material Science and Engineering,Northeastern University,Shenyang 110819,China
Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education),School of Material Science and Engineering,Northeastern University,Shenyang 110819,China
School of Material Science and Engineering,North Minzu University,Yinchuan 750021,China
National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China
NETL
NSTL
万方数据
