Deformation twinning in Ti-6Al-4V during low strain rate deformation to moderate strains at room temperature
Deformation twinning in Ti-6Al-4V during low strain rate deformation to moderate strains at room temperature
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DOI：
10.1016/j.msea.2010.05.039
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发表时间：
2010-08-20
期刊：
影响因子：
6.4
通讯作者：
Preuss, M.
中科院分区：
文献类型：
--
作者：
Prakash, D. G. Leo;Ding, R.;Preuss, M.
本研究考察了室温下缓慢应变速率(10（-6)s(-1)）下，Ti-6Al-4V在中度（4 - 14%）单轴压缩过程中发生孪晶的可能性。为了做到这一点，制造的起始材料在横向和法线方向上具有强大的基底织构成分，但在滚动方向上没有。仅在平行于轧制方向的6%压缩变形后，就可以识别出在轧制方向上引入强基底织构成分的显著织构变化。透射电镜分析提供了晶粒内孪晶的证据，但体积分数太低，无法解释织构的变化。进行了详细的EBSD映射，显示变形材料中越来越多的全晶粒c轴与加载方向对齐，提示全晶粒孪晶。晶粒突然完全孪晶的根本原因目前还无法推测，但有人认为孪晶成核所需的应力明显高于孪晶扩展所需的应力。(C) 2010 Elsevier B.V.版权所有
This study examines the possibility of twinning to occur in Ti-6Al-4V during moderate (4 - 14%) uniaxial compression at room temperature using a slow strain rate (10(-6)s(-1)). To do this, the starting material was manufactured to have strong basal texture components in the transverse and normal directions but not in the rolling direction. After only 6% compressive deformation parallel to the rolling direction it was possible to indentify a significant texture change introducing a strong basal texture component in the rolling direction. TEM analysis provided evidence of twins within grains, but at too low a volume fraction to explain the texture changes. Detailed EBSD mapping was carried out and showed an increasing number of entire grains to have their c-axis aligned with the loading direction in the deformed material, suggestive of entire grain twinning. The root cause for sudden complete grain twinning can only be speculated about at the moment, but it is suggested that the stress required for twin nucleation is significantly higher than that required for their propagation. (C) 2010 Elsevier B.V. All rights reserved.