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Microstructure and superplasticity of AZ31 sheet fabricated by differential speed rolling
Microstructure evolution and superplasticity in AZ31 alloy by differential speed rolling (DSR) with a high-speed ratio (=3) between the upper and lower rolls was examined. With increase in thickness reduction by DSR at 473 K, degree of grain refinement and microstructure homogeneity increased. The m...
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Published in: | Journal of alloys and compounds 2009-08, Vol.483 (1), p.279-282 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Microstructure evolution and superplasticity in AZ31 alloy by differential speed rolling (DSR) with a high-speed ratio (=3) between the upper and lower rolls was examined. With increase in thickness reduction by DSR at 473
K, degree of grain refinement and microstructure homogeneity increased. The microstructure obtained by a single rolling pass for a 70% reduction in thickness consisted of recrystallized grains with a mean size of ∼2
μm, and fraction of HAGBs and average misorientation angle determined by the EBSD analysis were 0.47 and 23.21°, respectively. The DSR AZ31 alloy exhibited enhanced superplasticity as compared with the conventionally processed AZ31. A maximum elongation of 830% was obtained at 2
×
10
−4
s
−1 and 673
K. The strain hardening exponent measured at 2
×
10
−4
s
−1 and 673
K was as high as 0.71, which could be related to accelerated grain growth in the highly refined microstructure during superplastic flow. |
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ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2008.08.130 |