Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30194
Title: Strain rate sensitivity of a high-strain-rate superplastic Al6061/20SiCW composite under uniaxial and equibiaxial tension
Authors: Chan, KC 
Tong, GQ
Keywords: Aluminum-based composite
Gas pressure forming
Strain rate sensitivity exponent
Superplasticity
Issue Date: 2001
Publisher: North-Holland
Source: Materials letters, 2001, v. 51, no. 5, p. 389-395 How to cite?
Journal: Materials letters 
Abstract: Strain rate sensitivity exponent is an important parameter to describe the ability of a material to resist necking. Less research has been done to examine strain rate sensitivity of high-strain-rate superplastic aluminum-based composites under different stress states. In this paper, experimental investigations have been carried out to examine the deformation behavior of Al6061/20SiCW composite under both uniaxial and equibiaxial tension. A maximum elongation of about 505% was observed at an initial strain rate of 6.56 × 10-2 s-1 and at a temperature of 873 K. Similar m value is observed under uniaxial and equibiaxial tension. The results also show that m value is almost independent of true strain, which differs from conventional superplastic alloys. It is believed that no significant concurrent matrix-grain growth is one of the reasons for the phenomenon. The reasons for a large discrepancy between the stress-strain rate curves under uniaxial and equibiaxial tension are also discussed in the paper.
URI: http://hdl.handle.net/10397/30194
ISSN: 0167-577X
EISSN: 1873-4979
DOI: 10.1016/S0167-577X(01)00326-3
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