An examination of strain weakening and self-annealing in a Bi-Sn alloy processed by high-pressure torsion

Wang, Chuan Ting and Langdon, Terence G (2021) An examination of strain weakening and self-annealing in a Bi-Sn alloy processed by high-pressure torsion. Materials Letters, 301, [130321]. (doi:10.1016/j.matlet.2021.130321).

Record type: Article

Abstract

The high pressure torsion (HPT) process was performed on a Bi-Sn eutectic alloy up to 10 revolutions and the materials were stored at room temperature for durations up to 91 days in order to investigate the strain weakening and self-annealing behaviour of the alloy. The results show that HPT processing leads to significant grain refinement and enhanced superplasticity in the alloy. When the material is stored at room temperature, the grain size increases and the microhardness also increases producing a near linear relationship between grain size and microhardncess. This effect is attributed to the enhanced creep behaviour of the Bi-Sn alloy after HPT processing.

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CTWang-Mat Lett-20210610-TGL - Accepted Manuscript

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Accepted/In Press date: 21 June 2021

e-pub ahead of print date: 23 June 2021

Published date: 15 October 2021

Additional Information: Funding Information: This work was supported in part by the National Science Foundation of the United States under Grant No. DMR-1160966 and in part by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS . Publisher Copyright: © 2021 Elsevier B.V.

Keywords: Bi-Sn alloy, hardness, high-pressure torsion, self-annealing, superplasticity