Anisotropic shock response of titanium: Reorientation and transformation mechanisms

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• 作者：Hongxiang Zong ; Turab Lookman ; Xiangdong Ding ; Sheng-Nian Luo ; Jun Sun
• 关键词：Shock compression ; Martensitic transition ; Titanium ; Orientation relationships
• 刊名：Acta Materialia
• 出版年：15 February, 2014
• 年：2014
• 卷：65
• 期：Complete
• 页码：10-18
• 全文大小：4310 K

文摘

We investigate shock-induced phase transformations in titanium (伪-Ti) single crystals induced by shock loading along the [0 0 0 1], and directions using molecular dynamics simulations. We find a significant dependence of the microstructure evolution on the crystallographic shock direction, providing insight into the nature of the coupling between deformation and phase transformation. For shock along the c-axis, the orientation relationships (ORs) and between parent and product phases are observed, which differs from that previously reported for Ti. For shock compression along the and directions, there is a reorientation of the hexagonally close-packed 伪 phase before the 伪 鈫?#xA0;蠅 martensitic transformation, and the OR is consistent with the previously proposed Silcock relationship. We associate the reorientation with a shuffle and shear mechanism and suggest that shear stress is an underlying factor for the anisotropic phase transformation sensitivity.