Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1580279 | Materials Science and Engineering: A | 2009 | 6 Pages |
Abstract
Grain size of the ZK60 alloy was effectively reduced to 1â¼2 μm through high-ratio differential speed rolling (HRDSR) for a thickness reduction of 70% in a single pass. Due to the strengthening effects of grain boundaries and particles, the HRDSR processed ZK60 exhibited a high tensile strength of 340 MPa. Low temperature superplasticity was attained at 473-493 K at low strain rates (5 Ã 10â4 sâ1) and high strain rate superplasticity was attained at 523-553 K at high strain rates (10â2 sâ1). The optimum superplastic temperature was found to be 553 K where a maximum tensile elongation of â¼1000% was obtained at 1 Ã 10â3 sâ1. The deformation behavior of the HRDSR processed ZK60 at elevated temperatures could be depicted by considering contribution of grain boundary sliding and slip creep to total plastic flow. Difference in superplastic deformation behavior between the HRDSR processed and equal channel angular press processed ZK60 alloys was examined and discussed.
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Physical Sciences and Engineering
Materials Science
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Authors
W.J. Kim, M.J. Kim, J.Y. Wang,