High Temperature Deformation Flow Of A ZK60A Magnesium Alloy After Extrusion

Flow behavior of a ZK60A magnesium alloy after continuous casting and subsequent extrusion was examined in tension at a range of strain rates of 3.0×10 − 1.0×10 s at temperatures of 473-623K. The results demonstrated that the alloy exhibited a maximum elongation of ~250% at 523K when tested at an in...

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Bibliographic Details
Published in:Archives of metallurgy and materials 2015-06, Vol.60 (2), p.1327-1330
Main Authors: Kawasaki, M., Lee, H.-J., Oh, M.C., Ahn, B.
Format: Article
Language:English
Subjects:
activation energy
extrusion
flow mechanism
magnesium alloy
tensile property
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Summary:Flow behavior of a ZK60A magnesium alloy after continuous casting and subsequent extrusion was examined in tension at a range of strain rates of 3.0×10 − 1.0×10 s at temperatures of 473-623K. The results demonstrated that the alloy exhibited a maximum elongation of ~250% at 523K when tested at an initial strain rate of 1.0×10 s and strain rate sensitivity, , of ~0.3-0.4 and the activation energy of ~94 kJ/mol were calculated under the testing conditions. The detailed investigation suggested that the high temperature flow of the ZK60A alloy having submicrometer grains demonstrates quasi-superplastic flow behavior controlled by a dislocation viscous glide process.
ISSN:2300-1909
1733-3490
2300-1909
DOI:10.1515/amm-2015-0124