Intrinsic anisotropy of strain rate sensitivity in single crystal alpha titanium
Intrinsic anisotropy of strain rate sensitivity in single crystal alpha titanium
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DOI：
10.1016/j.actamat.2016.07.044
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发表时间：
2016-10
期刊：
影响因子：
9.4
通讯作者：
Zhen Zhang;T. Jun;T. Benjamin Britton;F. Dunne
中科院分区：
文献类型：
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作者：
Zhen Zhang;T. Jun;T. Benjamin Britton;F. Dunne
通过耦合晶体塑性模拟和微柱压缩实验，确定了钛合金(Ti-6242) α (HCP)相基滑移体系和棱柱滑移体系的室温本征应变率灵敏度（SRS）。来自位移保持测试的载荷-位移数据，在实验和模拟中，已经能够确定晶体塑性模型中与速率相关的滑移规则。通过微柱定向获得了单基滑移和柱形滑移的滑移系统SRS。晶体塑性建模明确捕获微柱几何形状，晶体取向，以及实验测试框架和样品安装组件的刚度。即使在单相微柱压缩实验中，考虑黏着剂和荷载框架的刚度对于提取固有速率相关的材料响应是必不可少的，而不是结构响应。我们发现基底滑移的本征SRS比棱柱滑移的本征SRS强。这一发现对于理解在极端载荷条件下广泛应用的六边形材料的各向异性速率相关响应具有重要意义。
The room temperature intrinsic strain rate sensitivities (SRS) of basal and prismatic slip systems have been determined for the α (HCP) phase of a titanium alloy (Ti-6242), through coupled crystal plasticity modelling and micro-pillar compression experiments. Load-displacement data from displacement hold tests, in both experiment and simulation, have enabled determination of the rate-dependent slip rule within the crystal plasticity model. Slip system SRS has been obtained, via micro-pillars orientated for single basal and prismatic slip. Crystal plasticity modelling explicitly captures micro-pillar geometry, crystal orientation, as well as the stiffnesses of components of the experimental testing frame and sample mounting. Consideration of the stiffness of the adhesive and load frame is shown to be essential for extraction of the intrinsic rate-dependent material response, rather than the structural response, even in single phase micro-pillar compression experiments. We find that the intrinsic SRS of basal slip is stronger than that for prismatic slip. This finding has significant implications in understanding the anisotropic rate-dependent response of hexagonal materials applied extensively under extreme loading conditions.