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Evolution of texture and deformation microstructure in Ta–2.5W alloy during cold rolling

Published online by Cambridge University Press:  04 September 2015

Shan Wang ,
Chang Chen ,
Yanlin Jia  and
Mingpu Wang
Shan Wang
Affiliation:
Institute of Industry and Equipment Technology, Hefei University of Technology, Anhui 230009, China
Chang Chen*
Affiliation:
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China; and National-Local Joint Engineering Research Center of Nonferrous Metals and Processing Technology, Hefei University of Technology, Anhui 230009, China
Yanlin Jia
Affiliation:
School of Materials Science and Engineering, Central South University, Hunan 410083, China
Mingpu Wang
Affiliation:
School of Materials Science and Engineering, Central South University, Hunan 410083, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The texture and deformation microstructures of Ta–2.5W alloy were investigated during cold rolling process. The microhardness can reach 280 HV when the reduction was 40%. Meanwhile, the mature body-centered cubic rolling texture was developed. The dislocation configuration appeared in a sequence from long straight dislocations and dislocation loops, followed by dislocation tangles and finally to cells boundaries and long, continuous planar boundaries. Microbands did not appear until the reduction reached 20%. The density of microbands increased with increasing reduction. The dislocations within the boundaries of microbands tended to rearrange themselves with increasing strain in a sequence from tangled dislocations, followed by parallel dislocations and finally into dislocation nets. Meanwhile, the boundaries had at least one primary set of parallel dislocations lying along the longitudinal direction of the boundaries during the whole cold-rolled process. The formation of microbands based on the double cross-slip of long straight screw dislocations was confirmed.

Keywords

Ta–W alloymicrostructurecold-rolledmicrobandsdislocations
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 18 , 28 September 2015 , pp. 2792 - 2803
Copyright
Copyright © Materials Research Society 2015 

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