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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.59  No.5 (2018)  >  pp.717-723

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Effect of Ag Addition to Zn22 mass%Al-2 mass%Cu Alloy on the Four-Phase Reaction η + ε → α + τ′

H.J. Dorantes-Rosales, V.M. López-Hirata, Felipe Hernández-Santiago, M.L. Saucedo-Muñoz and Ana María Paniagua-Mercado
Instituto Politécnico Nacional, ESIQIE-ESFM, Ciudad de México, 07300, México

The effect of Ag additions to the four-phase, η + ε → α + τ′, was studied experimental and thermodynamically using Zn-22 mass%Al-2 mass%Cu base alloys with four Ag contents from 0 to about 4 mass% Ag. SEM and XRD results indicated the presence of the τ′ phase decreased as the Ag content increased for the aged alloys which can be attributed to the stabilization of the ε phase because of its increase in Ag content which is in agreement with Thermo-Calc results. The Ag addition also promoted a slowest decrease in hardness in the aging curves at 200°C which can be attributed to the slowest diffusion process for the quaternary alloy.

Ag additions, Zn22 mass%Al-2 mass%Cu alloy, four-phase reaction, thermodynamic stability, aging curves

Received: November 17, 2017
Accepted: February 13, 2018 , Published online: April 25, 2018
The Japan Institute of Metals and Materials



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