Pseudoelastic behaviour of cast magnesium AZ91 alloy under cyclic loading-unloading

Cáceres , C. H., Sumitomo, T. and Veidt, M. (2003) Pseudoelastic behaviour of cast magnesium AZ91 alloy under cyclic loading-unloading. Acta Materialia, 51 20: 6211-6218. doi:10.1016/S1359-6454(03)00444-0

Author Cáceres , C. H.
Sumitomo, T.
Veidt, M.
Title Pseudoelastic behaviour of cast magnesium AZ91 alloy under cyclic loading-unloading
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
Publication date 2003-12
Sub-type Article (original research)
DOI 10.1016/S1359-6454(03)00444-0
Volume 51
Issue 20
Start page 6211
End page 6218
Total pages 8
Place of publication Oxford, England
Publisher Pergamon-Elsevier Science
Collection year 2003
Language eng
Subject C1
291403 Alloy Materials
671001 Structural metal products
0912 Materials Engineering
Formatted abstract
Large stress-strain hysteresis loops are observed under cyclic loading after a small plastic prestrain. Loops have been observed in sand-cast material in a variety of tempers under tension or compression, and in high-pressure die-cast material with different cross-section thickness tested in tension. The loops are first observed after a nucleation strain of between 0.001 and 0.01% and grow to a maximum width after 1–2% plastic strain, becoming slightly narrower afterwards. When fully developed, the loops add a large (0.3–0.45%) pseudoelastic strain to the elastic strain, effectively decreasing the elastic modulus of the alloy by up to 70%. In sand-cast material of a given temper, the effects tend to be more pronounced in compression than in tension. Further, the effect is slightly larger in die-cast or aged sand-cast as compared to as-cast sand-cast material. The phenomenon is discussed in terms of the partial reversal of {1 0 1 2} twins upon unloading.
© 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 02:43:13 EST