MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
High-Strain-Rate Superplasticity in an AZ91 Magnesium Alloy Processed by Ingot Metallurgy Route
Hiroyuki WatanabeToshiji MukaiKoichi IshikawaKenji Higashi
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2002 Volume 43 Issue 1 Pages 78-80

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Abstract

High-strain-rate superplastic magnesium alloy, AZ91, was processed through the ingot metallurgy route. The relationship between working temperature and resulting grain size indicated that the grain size tends to decrease with decreasing working temperature in AZ91. Based on this preliminary result, the ingot was hot extruded at a relatively low temperature of 523 K with a reduction ratio of 44. A very fine grain size of 1.7 \\micron was attained only by hot extrusion. The fine-grained structure was stable blow 573 K. Owing to the fine grain size, high-strain-rate superplasticity was observed at temperatures of ∼548 K.

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© 2002 The Japan Institute of Metals and Materials
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