METALS
Strain accommodation of <110>-normal direction-
oriented grains in micro-shear bands of high-purity
tantalum
Yahui Liu
1
, Shifeng Liu
1,2,
*, Jialin Zhu
1
, Haiyang Fan
3
, Chao Deng
1,2
, Lingfei Cao
1,2
, Xiaodong Wu
1
, and
Qing Liu
1
1
College of Materials Science and Engineering, Chongqing University, No. 174 Shazheng Street, Shapingba District,
Chongqing 400044, China
2
Electron Microscopy Center of Chongqing University, Chongqing University, Chongqing 400044, China
3
Department of Mechanical Engineering, KU Leuven, Louvain, Belgium
Received: 30 January 2018
Accepted: 25 May 2018
Published online:
29 May 2018
Ó
Springer Science+Business
Media, LLC, part of Springer
Nature 2018
ABSTRACT
The \110[ND\uvw[(\110[//normal direction)(\110[ND) grains in micro-
shear bands in high-purity tantalum were investigated using electron
backscatter diffraction and X-ray line profile analysis. The generation of the
\110[ND grains and their subdivision and rotation behaviors upon the sub-
sequent deformation were characterized by multi-scale analysis methods based
on information about the slip systems, misorientation angle/axes and stored
energy. The obtained results show that in the transverse plane, \110[ND grains
are oriented at angles of 15°–25° to the adjacent deformed matrices in the 60%
rolled specimen, and at angles of 25°–35° in the 87% rolled specimen. The
\110[ND grain provided strain accommodation during the shear deformation.
Moreover, the energy of the \110[ND grains in the 87% rolled specimen is
approximately three times larger than that in the 60% rolled specimen, indi-
cating that the role of strain accommodation is enhanced with the increase in the
micro-shear stress concentration in a local region in tantalum.
Introduction
Grains with small size and uniform orientations are
highly advantageous for the sputtering performance
of a tantalum (Ta) sputtering target [1]. The mor-
phology of recrystallized grains is largely dependent
on the nucleation and subsequent recrystallization
behaviors, and these behaviors are influenced by the
microstructure in the cold worked Ta [2–4]. Because
of the high stacking-fault-energy (SFE) value for Ta,
grains with different orientations in Ta reveal very
different deformation behaviors upon cold working
[5, 6]. In particular, grains with the
{111}\uvw[(\111[//normal direction) orientation
(hereafter abbreviated {111} orientation) experience
inhomogeneous deformation accompanied by the
Address correspondence to E-mail: liusf06@cqu.edu.cn
https://doi.org/10.1007/s10853-018-2506-y
J Mater Sci (2018) 53:12543–12552
Metals
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