Early decomposition of supersaturated solid solutions of Al-Zn-Mg casting alloys

被引：20
|
作者：
Dellah, M. [1 ,2 ]
Bournane, M. [2 ]
Ragab, Kh A. [2 ,3 ]
Sadaoui, Y. [4 ]
Sirenko, A. F. [5 ]
机构：
[1] Univ Tizi Ouzou, Dept Chim, Tizi Ouzou, Algeria
[2] Univ Quebec Chicoutimi, CURAL, Chicoutimi, PQ G7H 2B1, Canada
[3] Cairo Univ, Fac Engn, Dept Met, Cairo, Egypt
[4] Univ Tizi Ouzou, Dept Phys, Tizi Ouzou, Algeria
[5] Univ Kharkov, Fac Phys, Kharkov, Ukraine
来源：
MATERIALS & DESIGN | 2013年 / 50卷
关键词：
Aluminum alloys; Electrical resistance; Hardness; Phase transformation; Small angle X-ray scattering; Solid solution decomposition; 2-STEP AGING TREATMENT; MICROSTRUCTURAL EVOLUTION; MECHANICAL-PROPERTIES; HEAT-TREATMENTS; CU ALLOY; PRECIPITATION; ZONES;
D O I：
10.1016/j.matdes.2013.02.078
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study aimed at investigating the structural, electrical resistivity and hardness changes of aged Al-Zn-Mg alloys. It was observed that the isothermal annealing in temperature range of 25-200 degrees C leads to the following precipitation sequence: Guinier-Preston zones -> eta'-phase -> eta-phase. The significant increase of electrical resistivity (rho) of the considered alloys was associated with the stage of GP zone decomposition. The formation of the intermediate eta'-phase was accompanied with a decrease of electrical resistivity and an increase of hardness. Non-continuous quenching was found to suppress the eta'-phase formation; while elevated quenching rates led to the formation of uniformly distributed fine precipitates in the alloy bulk. (c) 2013 Elsevier Ltd. All rights reserved.
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页码：606 / 612
页数：7
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