Microstructure evolution of 6063 aluminum alloy during double-pass hot deformation

doi:10.13251/j.issn.0254-6051.2020.05.005

Abstract

Abstract: Double-pass hot rolling test on 6063 aluminum alloy was carried out by using Gleeble-1500 thermal simulator. Flow stress and microstructure of the alloy when the deformation temperature was 300-500 ℃, the strain rate was 0.001-0.1 s^-1 and the residence time between passes was 10-90 s were analyzed. The results show that the yield stress of the second pass decreases with the increase of the residence time between passes, and the static softening rate of the alloy is affected by the temperature and the residence time between passes. There is more strengthening phase in the double-pass hot rolled alloy under the condition of low temperature, high strain rate and short residence time between passes, which morphology is mainly strip and round, however, when under the condition of high temperature, low strain rate and long residence time between passes, the content of the strengthening phase decreases and its morphology is mainly round. Besides, the strengthening phase in the alloy is mainly AlFeSi phase, and the strip-like phase has a length of about 6 μm and the round phase has a size of about 2 μm.

Key words: 6063 aluminum alloy, double-pass, hot compression, flow stress, microstructure

CLC Number:

TG166.3

Wang Guan, Tian Changling, Kou Linyuan, Bian Dongwei. Microstructure evolution of 6063 aluminum alloy during double-pass hot deformation[J]. Heat Treatment of Metals, 2020, 45(5): 23-28.

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