Enhanced Grain Refining Efficiency Assisted by Martensitic Transformation in Metastable β-Titanium Alloy
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- 作者：Chen Wei ; weichen813@gmail.com" class="auth_mail" title="E-mail the corresponding author ; Yao Shanshan ; Liu Ruolei ; Sun Qiaoyan ; Xiao Lin ; Sun Jun
- 关键词：titanium alloys ; multi-impact process ; martensitic transformation ; deformation twinning ; nanograins
- 刊名：Rare Metal Materials and Engineering
- 出版年：2015
- 出版时间：July 2015
- 年：2015
- 卷：44
- 期：7
- 页码：1601-1606
- 全文大小：1845 K
文摘
The microstructural evolution and formation mechanism of nanograins in Ti-2Al-2.5Zr α-titanium alloys and Ti-10V-2Fe-3Al metastable β-titanium alloys subjected to multi-impact process at ambient temperature were investigated using optical microscopy, X-ray diffraction and transmission electron microscopy. The results show that deformation twinning, dislocation activities and shear banding successively dominate plastic deformation in Ti-2Al-2.5Zr alloy. In contrast, deformation-induced martensitic phase transformation becomes prevalent in Ti-10V-2Fe-3Al alloy. Martensitic subdivision, shear banding and reverse martensitic transformation contribute to grain refinement. Moreover, nanograins are finally achieved in both titanium alloys at a strain of 1.2, but grain refining efficiency is more significant in Ti-10V-2Fe-3Al alloy. The accelerated grain refinement could be attributed to the assistance of martensitic phase transformation.