T6I6处理对Al-Si-Mg-Cu铸铝时效析出及疲劳行为的影响

doi:10.11896/cldb.19080066

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Abstract The effects of T6I6 treatment on the precipitation and fatigue behaviour of Al-Si-Mg-Cu cast aluminum alloy were investigated by using hardness test, mechanical tensile test, fatigue test and transmission electron microscopy (TEM). The results show that the main strengthening-phases of the T6 peak-aged and T6I6 peak-aged alloy were GP zone and β″ precipitates. Compared with T6 peak-aged alloy, the yield strength and tensile strength of the T6I6 peak-aged alloy increased by 7.3 MPa and 11.5 MPa, respectively, and its elongation also increased by 4.1%. In addition, under the same loading condition, the T6I6 peak-aged alloy exhibited a longer fatigue life. At the maximum stress of 175 MPa, the fatigue life of the T6I6 peak-aged alloy was enhanced by 63.0% compared with that of T6 peak-aged alloy.

Key words： Al-Si-Mg-Cu cast aluminum alloy T6I6 aging treatment microstructure fatigue behaviour

Published: 14 July 2020

CLC number:

TG146.2

Fund:This work was financially supported by the National Natural Science Foundation of China (51405153, 51875197).

About author:: Yuqiang Chen, Ph. D., associate professor, vice dean of School of Material Science and Engineering in Hunan University of Science and Technology. He was selected for “Hunan young talents”, “the Young Core Instructor from the Education Commission of Hunan Province” and “Training program for Hunan science and technology innovation and entrepreneurship elites to Germany in 2018”. He has published more than 40 journal papers, applied more than 10 national invention patents.His team's research interests are the processing technology, microstructure characterization and fatigue damage mechanism of high-performance aluminium alloys.He is the reviewer of the journals such as Journal of Alloys and Compounds, Micro & Nano Letters, etc.

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	CHEN Yuqiang
	ZHANG Wentao
	ZHANG Hao
	PAN Suping
	LI Yunxiang
	LI Ningbo
	OU Chengui
	FU Mingzhu
	YANG Mingguang

Cite this article:

CHEN Yuqiang,ZHANG Wentao,ZHANG Hao, et al. Effects of T6I6 Treatment on the Precipitation and Fatigue Behaviour of Al-Si-Mg-Cu Cast Aluminum Alloy[J]. Materials Reports, 2020, 34(14): 14122-14128.

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http://www.mater-rep.com/EN/10.11896/cldb.19080066 OR http://www.mater-rep.com/EN/Y2020/V34/I14/14122

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