Transformation-induced plasticity in omega titanium
Transformation-induced plasticity in omega titanium
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DOI：
10.1063/5.0035465
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发表时间：
2021-01-07
影响因子：
3.2
通讯作者：
Cao, Lei
中科院分区：
文献类型：
--
作者：
Zahiri, Amir Hassan;Ombogo, Jamie;Cao, Lei
-钛（Ti）是一种高压相，通常被认为是脆性和不可变形的，尽管对其变形过程的直接研究仍然很少。本文通过分子动力学模拟研究了具有初始缺陷的ω - ti的变形过程，发现应力诱导的ω -> α马氏体相变可以在不同的加载方向下使ω - ti产生广泛的塑性。此外，我们还首次证明了通过ω -> α马氏体相变可以形成四种类型的相变孪晶——{112 1}、{112 2}、{101 2}和{101孪晶。这项工作促进了对ω -Ti塑性变形的理解，揭示了亚稳态ω -相在相变孪晶形成中的重要作用。
omega -titanium (Ti) is a high-pressure phase that is conventionally perceived to be brittle and nondeformable, although direct investigations of its deformation process remain scarce. In this work, we perform molecular dynamics simulations to study the deformation process ofomega -Ti with initial defects and find that stress-inducedomega -> alpha martensitic transformation can cause extensive plasticity inomega -Ti under various loading directions. Moreover, for the first time, we demonstrate that four types of transformation twins-{ 112 1 },{112 2 },{101 2 }, and{101twins-can be formed through theomega -> alpha martensitic phase transformation. This work advances the understanding of plastic deformation inomega -Ti and unveils the essential role of the metastableomega -phase in the formation of transformation twins.