MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Effect of Aging and Stress on Stability of β Phase in Au-Cd-Ag
Yuki MatsuokaMao Fujita
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2016 Volume 57 Issue 5 Pages 624-626

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Abstract

Au52.5-xCd47.5Agx has a single β phase in the composition range of x ≤ 41 and a wide temperature range extending to room temperature or below. Coexistence of the β and α phases has been observed for 41 < x < 47, and the coexistence of the β, α, and ζ phases has been observed for x ≥ 47, as thermal equilibrium states. We found that the α phase appears and coexists with the β phase for x ≤ 41 in the aged alloy at room temperature. The mole fraction and the stability of the α phase depend on the atomic order of the β phase. Moreover, it was found that the ζ phase is stress induced in the composition range of x ≤ 41. The ζ phase disappears with heat treatment to release strain, and so this ζ phase is not stable.

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© 2016 The Japan Institute of Metals and Materials
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