材料科学
晶体孪晶
合金
假弹性
可塑性
无扩散变换
变形(气象学)
形状记忆合金
钛合金
相(物质)
马氏体
模数
晶体塑性
弹性模量
变形机理
复合材料
结晶学
微观结构
化学
有机化学
作者
Jiaming Zhu,Hong‐Hui Wu,Dong Wang,Yipeng Gao,Dan Wang,Yulin Hao,Rui Yang,Tong‐Yi Zhang,Yunzhi Wang
标识
DOI:10.1016/j.ijplas.2016.11.006
摘要
The gum-like multifunctional β-Ti alloy Ti-24Nb-4Zr-8Sn-0.10O (in wt.%), known as Ti2448, has attracted a lot of attention lately for promising biomedical applications due to its ultralow apparent elastic modulus, high strength, super-elasticity, strong fatigue resistance, and excellent biocompatibility. In this study we investigate the deformation mechanisms in association with martensitic transformation (MT) in the alloy. Using a combination of crystallographic analysis and phase field simulation we find a rich variety of strain-accommodating domain patterns, including 30 twinning modes and 6 herringbone structures. These diverse strain accommodating modes, especially the excellent geometrical compatibilities of the twins and herringbone structures, provide the MT with great flexibility to adapt to arbitrary shape changes and defect structures generated during plastic deformation, which may have contributed to the exceptional mechanical properties of the alloy.
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