Strength scaling law, deformation kinetics and mechanisms of nanostructured Ti
Strength scaling law, deformation kinetics and mechanisms of nanostructured Ti
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DOI：
10.1016/j.msea.2013.02.054
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发表时间：
2013-06-20
期刊：
影响因子：
6.4
通讯作者：
Wang, Y. M.
中科院分区：
文献类型：
--
作者：
Li, Y. K.;Liu, F.;Wang, Y. M.
研究了等径角挤压加一系列热处理工艺制备的纳米结构钛的拉伸性能、应变速率敏感性和激活体积。实现了强度和拉伸塑性的同时提高。应变速率敏感性随着晶粒尺寸的减小而降低（类似于150-450 nm）。提出并讨论了一种新的Hall-petch关系。在70 ℃左右的内耗峰的分析表明，孪晶可以发挥退火的纳米结构的Ti的应变硬化的主要作用，与极小的激活体积一致。(C)2013爱思唯尔有限公司版权所有。
We investigate the tensile properties, strain rate sensitivity, and activation volume of nanostructured Ti prepared by equal channel angular pressing plus a series of thermal treatment. Simultaneous enhancement of strength and tensile ductility is achieved. The strain rate sensitivity is found to decrease with decreasing grain sizes (similar to 150-450 nm). A new Hall-petch relationship is presented and discussed. The analyses on the internal friction peaks at around 70 degrees C suggest that twins could play the primary role for the strain hardening of the annealed nanostructured Ti, consistent with the miniscule activation volumes. (C) 2013 Elsevier B.V. All rights reserved.