Anelastic Phenomena in Mg-Al Alloys
D. Nagarajana, C.H. Caceresa and J.R. Griffithsb
aARC-Centre of Excellence for Design in Light Metals, Materials Engineering, School of Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
bCSIRO Process Science & Engineering, P.O. Box 883, Kenmore, QLD 4069, Australia
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Cyclic loading-unloading in tension and compression has been used to quantify the anelastic behaviour, in the form: of hysteresis loops, of pure Mg and three Mg-Al alloys (0.5, 2, and 9 at.% Al). The effect reached a maximum at a plastic strain of ≈ 0.02 for all of the materials, and decreased at higher strains. The amount of anelasticity at any given strain was smaller for the dilute alloys in comparison with the pure Mg whereas it increased above that of pure Mg for the most concentrated alloy. Possible reasons for this behaviour are discussed in terms of reversible twinning, solid solution softening, and hardening and short range order.
DOI: 10.12693/APhysPolA.122.501
PACS numbers: 62.40.+i, 61.72.Mm, 81.40.Cd, 75.40.-s