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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.57  No.5 (2016)  >  pp.624-626

MATERIALS TRANSACTIONS
<<Previous article Vol.57  No.5 (2016)   pp.624 - 626 Next article>>

Effect of Aging and Stress on Stability of β Phase in Au-Cd-Ag

Yuki Matsuoka1), Mao Fujita2)
1) Faculty, Nara Women's University 2) Graduate School of Humanities and Science

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.


Keyword:
beta phase, alpha phase, zeta phase, aging, stress induction

Received: October 01, 2015
Accepted: February 05, 2016 , Published online: April 25, 2016

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