Original scientific paper

Temperature dependence of microstructure in Zn-Al alloys

Stanko Popović ; Physics Department, Faculty of Science, University of Zagreb, Bijenička cesta 32, 10001 Zagreb, Croatia
Biserka Gržeta ; "R. Bošković" Institute, Bijenička cesta 54, 10001 Zagreb, P.O.Box 1016, Croatia
Branko Hanžek ; Ministry of Education, Trg burze 6, 10000 Zagreb, Croatia
Snježana Hajster ; Physics Department, Faculty of Science, University of Zagreb, Bijenička cesta 32, 10001 Zagreb, Croatia

Abstract

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.

Keywords

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

Hrčak ID:

300971

URI

https://hrcak.srce.hr/300971

Publication date:

1.7.1999.

Article data in other languages: croatian

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