Achieving large super-elasticity through changing relative easiness of deformation modes in Ti-Nb-Mo alloy by ultra-grain refinement
Achieving large super-elasticity through changing relative easiness of deformation modes in Ti-Nb-Mo alloy by ultra-grain refinement
复制标题
通过超晶粒细化改变 Ti-Nb-Mo 合金变形模式的相对容易程度来实现大超弹性
DOI：
10.1080/21663831.2021.1875080
复制
发表时间：
2021
影响因子：
8.3
通讯作者：
B.J. Zhang, M.D. Huwang
中科院分区：
文献类型：
--
作者：
B.J. Zhang, M.D. Huwang
具有超细晶β相的Ti-13.3Nb-4.6Mo合金获得了接近理论预期值的超弹性。原位同步辐射X射线衍射分析表明，通过将β晶粒尺寸减小到亚微米，主要屈服机制由位错滑移转变为马氏体相变。通过屈服行为的转变反映的位错滑移和马氏体相变的临界应力对晶粒尺寸的不同依赖性是超细晶试样产生大的超弹性的主要原因。
Large super-elasticity approaching its theoretically expected value was achieved in Ti-13.3Nb-4.6Mo alloy having an ultrafine-grained β-phase. In-situ synchrotron radiation X-ray diffraction analysis revealed that the dominant yielding mechanism changed from dislocation slip to martensitic transformation by decreasing the β-grain size down to sub-micrometer. Different grain size dependence of the critical stress to initiate dislocation slip and martensitic transformation, which was reflected by the transition of yielding behavior, was considered to be the main reason for the large super-elasticity in the ultrafine-grained specimen.