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Temperature dependence of microstructure in Zn-Al alloys

The temperature dependence of microstructure in Zn-Al alloys, transferred to the equilibrium state by quenching from the solid solution temperature, TSS, to room temperature (RT) and prolonged ageing at RT, was studied in situ by Xray powder diffraction. Instead of the phase transitions expected according to the phase diagram, namely α(M/β) + β → α’ + α(M/α’) → αSS for the alloy with 54 at% Zn and α(M/β) + β → α’+β → αSS for the alloy with 62 at% Zn, the following sequence was observed for both alloys: α(M/β) + β → α’ + β + α(M/α’,β) → α’+β → αSS. In the cooling run, a temperature hysteresis in reversal phase transitions was observed. During a repeated heating, the microstructure depended on the previous thermal treatment of the alloys.

Zn-Al alloys; solid solution; phase transition; phase diagram; X-ray powder diffraction

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