The Effect of Different Annealing Temperatures on Recrystallization Microstructure and Texture of Clock-Rolled Tantalum Plates with Strong Texture Gradient

被引:5
|
作者
Zhu, Jialin [1 ]
Liu, Shifeng [1 ,2 ]
Yang, Shuai [1 ]
Zhang, Yu [1 ]
Zhang, Jing [1 ]
Zhang, Chenghang [1 ]
Deng, Chao [1 ,2 ]
机构
[1] Chongqing Univ, Coll Mat Sci & Engn, 174 Shazheng St, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Electron Microscopy Ctr, Chongqing 400044, Peoples R China
来源
METALS | 2019年 / 9卷 / 03期
基金
中国国家自然科学基金;
关键词
high purity tantalum; annealing temperature; texture; stored energy; microstructure; THROUGH-THICKNESS TEXTURE; ORIENTATION DEPENDENCE; EVOLUTION; COMPONENTS; SIMULATION; METALS;
D O I
10.3390/met9030358
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The texture and the bulk stored energy along the thickness direction were extremely inhomogeneous in the clock-rolled tantalum sheets with 70% reduction. Therefore, the effects of different annealing temperatures on the microstructure and texture distribution of tantalum plates through the thickness were investigated by X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). The results showed that the occurrence of strong {111} recrystallization texture in the center layer can be attributed to the subgrains nucleation mechanism when annealed at the low temperature. Many subgrains with {111} orientation appeared in the center layer, due to its high stored energy and preferential nucleation sites of the {111} deformed matrix, and rapidly grew into the effective nucleus, resulting in the large {111} grain size and strong {111} texture after complete recrystallization. Contrarily, at the high temperature, high-angle grain boundaries had sufficient driving force to generate migration, due to the lack of recovery, and the growth time of recrystallized nucleus was much shorter, contributing to relatively uniform recrystallization microstructure and texture distribution along the thickness.
引用
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页数:12
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