Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Aging Characteristics and High Temperature Tensile Properties of Mg-Gd-Y-Zr Alloys
Ifeanyi Anthony AnyanwuShigeharu KamadoYo Kojima
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2001 Volume 42 Issue 7 Pages 1206-1211


The individual contributions of Gadolinium and Yttrium to age hardening and high temperature strength of magnesium alloys containing both elements are investigated using alloys containing different Gd:Y mole ratios of 1:0, 3:1, 1:1, 1:3 and 0:1 with a constant Y+Gd content of 2.75 mol%. All investigated alloys exhibit remarkable age hardening by precipitation of β′′ phase with DO19 crystal structure and β phase with bco crystal structure even at aging temperatures higher than 200°C. Both precipitates are observed in peak-aged specimens. The precipitates contributing to age hardening are fine and their amount increases as Gd content increases, and this results in increased peak hardness, tensile strength and 0.2% proof stress but decreased elongation. On the other hand, higher Y content increases the elongation of the alloys but results in decreased strength.

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© 2001 The Japan Institute of Metals and Materials
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