沉积颗粒对7N01-T6铝合金疲劳裂纹扩展行为的影响

doi:10.11896/cldb.18030191

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Abstract The influences of graphite and alumina deposited particles on the fatigue crack propagation behavior of 7N01-T6 aluminum alloy at R=0.1 and R=0.5 were investigated by using a self-designed experimental method and combined with fatigue crack growth rate test and fracture morphology observation. The results show that the fatigue crack growth rate of the alloy in the graphite particle environment is the fastest under both stress ratio conditions in the crack growth stage Ⅰ and Ⅱ. When the R is 0.5, the fatigue crack growth rate of the alloy in the alumina particle environment is the slowest in the crack growth stage Ⅰ and Ⅱ. When the R is 0.1, ΔK<15 MPa·m^1/2, the fatigue crack growth rate of the alloy in the alumina particle environment is the slowest. When the ΔK in the range from 15 MPa·m^1/2 to 30 MPa·m^1/2, the fatigue crack growth rate of the alloy in the alumina particle environment and atmospheric environment is quite similar. The increase of fatigue crack growth rate in graphite particle environment is due to the lubricated by graphite particles. It reduces the effect of crack closure during unloading. The decrease of the fatigue crack propagation rate in the alumina particle environment is due to the deposition of alumina particles on the fracture surface enhances the crack closure level during unloading.

Key words： deposited particles aluminum alloy fatigue crack growth stress ratio microstructure

Published: 16 May 2019

CLC number:

TG146.2

Fund:This work was financially supported by the National Natural Science Foundation of China (51405153,51475162)

About author:: Chen Yuqiang, Ph. D., associate professor, vice director of Department of Material Forming and Control Engineering in Hunan University of Science and Technology, He was selected for “the Young Core Instructor from the Education Commission of Hunan Province” and “Training program for Hunan science and technology innovation and entrepreneurship ellites 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, microstructrure char-acterization 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
	SONG Wenwei
	PAN Suping
	LIU Wenhui
	SONG Yufeng
	ZHANG Hao

Cite this article:

CHEN Yuqiang,SONG Wenwei,PAN Suping, et al. The Effects of Deposited Particles on the Fatigue Crack Growth Behavior of 7N01-T6 Aluminum Alloy[J]. Materials Reports, 2019, 33(10): 1697-1701.

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http://www.mater-rep.com/EN/10.11896/cldb.18030191 OR http://www.mater-rep.com/EN/Y2019/V33/I10/1697

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