Dependence of microstructure of Al-44 at% and Al-48 at% zn alloys on temperature

Skoko, Željko and Popović, Stanko (2001) Dependence of microstructure of Al-44 at% and Al-48 at% zn alloys on temperature. Fizika A, 10 (4). pp. 191-202. ISSN 1330-0008

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Abstract

The temperature dependence of microstructure of the title alloys was studied in situ by XRD. Each alloy had been subjected to two different thermal treatments: (i) rapid quenching from the solid-solution temperature, T_SS, in water at room temperature (RT) and ageing at RT (samples WQ) and (ii) cooling slowly from TSS to RT and ageing at RT (samples SC). As the samples SC were closer to the equilibrium state than the samples WQ, the microstructure of the two sets of samples dependeded on temperature in a different way. The solid solution, aSS, was formed at about 720 K for the samples SC, and at about 880 K for the samples WQ. During the slow cooling to RT the samples SC and WQ behaved in a similar way. Instead of the phase transitions expected according to the phase diagram, the following sequence of transitions was observed for both alloys: α(M/β)+β(Zn) - α¢+β(Zn)+a(M/α¢,β) - α_SS. A similar thermal behaviour was also found for the Zn-rich alloys, Al-54 at% Zn and Al-62 at% Zn.

Item Type: Article
Keywords: Al-Zn alloys, solid solution, phase transition, phase diagram, X-ray powder diffraction
Date: 2001
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Publisher: Hrvatsko fizikalno društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 15 Apr 2014 16:34
Last Modified: 15 Apr 2014 16:34
URI: http://digre.pmf.unizg.hr/id/eprint/844

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