Effects of Aging Time on Microstructure and Properties of Wrought Al-Si Alloy

doi:10.12068/j.issn.1005-3026.2016.01.008

Abstract

Abstract: The effects of aging time on microstructure and properties of as-solutioned wrought Al-12.7Si-0.7Mg alloy artificial aged at 180℃ for different time were investigated. The results showed that the age hardening curves of different as-solutioned state alloys present single or twin peaks aging strengthening characteristics. Age hardening curve of wrought Al-Si alloy aged at 180℃ after solutioning at 520℃ for 30min exhibits obvious age hardening “twin peaks”， and the second age hardening peak is higher than the first one. The single and twin peaks age hardening phenomenon of alloy is closely related to the type， size， and the precipitation sequence of precipitates. The obvious interval during meta-stable phase transformation of alloy is the main reason for twin peaks aging hardening.

Key words: wrought Al-Si alloy, solution treatment, aging treatment, microstructure, mechanical property

CLC Number:

TG146.2⁺1

LIU Fang， YU Fu-xiao， ZHAO Da-zhi， ZUO Liang. Effects of Aging Time on Microstructure and Properties of Wrought Al-Si Alloy[J]. Journal of Northeastern University Natural Science, 2016, 37(1): 34-38.

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