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Metals 2019, 9(1), 75; https://doi.org/10.3390/met9010075

Effects of Annealing Temperature on Recrystallization Texture and Microstructure Uniformity of High Purity Tantalum

1
,
1,2,* , 1
,
1
and
1,2,*
1
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
2
Electron Microscopy Center of Chongqing University, Chongqing University, Chongqing 400044, China
*
Authors to whom correspondence should be addressed.
Received: 27 December 2018 / Revised: 9 January 2019 / Accepted: 11 January 2019 / Published: 12 January 2019
PDF [1258 KB, uploaded 12 January 2019]

Abstract

One hundred and thirty-five degree clock rolling significantly improves the texture homogeneity of tantalum sheets along the thickness, but a distinctly fragmented substructure is formed within {111} (<111>//normal direction (ND)) and {100} (<100>//ND) deformation grains, which is not suitable to obtain a uniform recrystallization microstructure. Thus, effects of different annealing temperatures on the microstructure and texture heterogeneity of tantalum sheets along the thickness were investigated by X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Results show that the texture distribution along θ-fiber and γ-fiber is irregular and many large grains with {111} orientation develop during annealing at high temperature. However, low-temperature annealing can not only weaken the texture intensity in the surface and the center layer but also introduce a more uniform grain size distribution. This result can be attributed to the subgrain-nucleation-dominated recrystallization mechanism induced by recovery at low temperature, and moreover, a considerable decline of recrystallization driving force resulting from the release of stored energy in the deformation matrix.
Keywords: high purity tantalum; clock rolling; annealing temperature; texture; microstructure high purity tantalum; clock rolling; annealing temperature; texture; microstructure
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhu, J.; Deng, C.; Liu, Y.; Lin, N.; Liu, S. Effects of Annealing Temperature on Recrystallization Texture and Microstructure Uniformity of High Purity Tantalum. Metals 2019, 9, 75.

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