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Crystallographic analysis of nucleation for random orientations in high-purity tantalum

Published online by Cambridge University Press:  11 June 2018

Yahui Liu ,
Shifeng Liu ,
Haiyang Fan ,
Chao Deng ,
Lingfei Cao ,
Xiaodong Wu  and
Qing Liu
Yahui Liu*
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Shifeng Liu*
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; and Electron Microscopy Center of Chongqing University, Chongqing University, Chongqing 400044, China
Haiyang Fan
Affiliation:
Department of Mechanical Engineering, KU Leuven, Heverlee B-3001, Leuven, Belgium
Chao Deng
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; and Electron Microscopy Center of Chongqing University, Chongqing University, Chongqing 400044, China
Lingfei Cao
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; and Electron Microscopy Center of Chongqing University, Chongqing University, Chongqing 400044, China
Xiaodong Wu
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Qing Liu*
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
*
a)Address all correspondence to this author. e-mail: liusf06@cqu.edu.cn
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Abstract

Strain path changes during clock rolling cause more serious interaction between adjacent grains, resulting in the occurrence of interactive regions (IRs) with random orientations. Furthermore, plenty of new grains with relatively random orientations are introduced by the subsequent annealing of these IRs. The morphology of the IR and the origin of random orientations were therefore investigated in this study, and the electron backscatter diffraction technique was used to characterize crystallographic orientations of nuclei and deformed matrices. A short-time annealing was imposed on a specimen to catch the transient nucleation behaviors. The results indicate that the orientations of nuclei are similar to their surrounding deformed matrices, especially the points with larger local-misorientation. Additionally, the shape of new grains depends on where it forms, and it is suggested that this fact mainly results from the great difference in stored energies between deformed matrices with {111} and {100} orientations.

Keywords

tantaluminteractive regionnucleationlocal-misorientationstored energy
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 12 , 28 June 2018 , pp. 1755 - 1763
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Copyright
Copyright © Materials Research Society 2018 

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References

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