Achieving superplasticity in a Bi-Sn alloy processed by high-pressure torsion

C.T. Wang, T.G Langdon
Accepted: 27 March 2015
Citation: C.T. Wang, T.G Langdon. Achieving superplasticity in a Bi-Sn alloy processed by high-pressure torsion. Letters on Materials, 2015, 5(3) 301-305
BibTex   DOI: 10.22226/2410-3535-2015-3-301-305

Abstract

A Bi-Sn alloy was processed by high-pressure torsion (HPT) at room temperature for 10 turns to achieve a homogeneous fine microstructure. Microhardness observations showed that the refined microstructure experienced self-annealing during storage at room temperature. Following HPT processing and storage at room temperature for 35 days, a sample had excellent superplastic properties when testing at an initial tensile strain rate of 1.0 × 10-4 s-1. The enhanced superplastic flow behavior of the fine-grained Bi-Sn alloy was attributed to the homogeneously distributed Bi-Sn and Sn-Sn boundaries after HPT processing since these are preferred sites for grain boundary sliding.

References (19)

1.
T.G. Langdon, J. Mater. Sci. 44, 5998 (2009).
2.
T.G. Langdon, Metall. Trans. 13A, 689 (1982).
3.
T.G. Langdon, Mater. Trans. 46, 1951 (2005).
4.
C.E Pearson J. Inst. Metals. 54, 111 (1934).
5.
Y. Ma, T.G. Langdon, Metall. Mater. Trans. A 25A, 2309 (1994).
6.
T.G. Langdon, Acta Mater. 61, 7035 (2013).
7.
R.Z. Valiev, T.G. Langdon, Prog. Mater. Sci. 51, 881 (2006).
8.
A.P. Zhilyaev, T.G. Langdon, Prog. Mater. Sci. 53, 893 (2008).
9.
R.B. Figueiredo, P.R. Cetlin, T.G. Langdon, Mater. Sci. Eng. A 528, 8198 (2011).
10.
R.B. Figueiredo, P.H.R. Pereira, M.T.P. Aguilar, P.R. Cetlin, T.G. Langdon, Acta Mater. 60, 3190 (2012).
11.
A. Loucif, R.B. Figueiredo, M. Kawasaki, T. Baudin, F. Brisset, R. Chemam, T.G. Langdon, J. Mater. Sci. 47, 7815 (2012).
12.
T.G. Langdon, Metal Sci. 16, 175 (1982).
13.
M. Kawasaki, T.G. Langdon, Mater. Sci. Eng. A 528, 6140 (2011).
14.
M. Kawasaki, S. Lee, T.G. Langdon, Scripta Mater. 61, 963 (2009).
15.
M. Kawasaki, A.de.A. Mendes, V.L. Sordi, M. Ferrante, T.G. Langdon, J. Mater. Sci. 46, 155 (2011).
16.
T.G. Langdon, Acta Metall. Mater. 42, 2437 (1994).
17.
R.Z. Valiev, T.G. Langdon, Acta Metall. Mater. 41, 949 (1993).
18.
R.B. Figueiredo, T.G. Langdon, J. Mater. Sci. 43, 7366 (2008).
19.
M. Kawasaki, N. Balasubramanian, T.G. Langdon, Mater. Sci. Eng. A528, 6624 (2011).