The Effects of Deposited Particles on the Fatigue Crack Growth Behavior of 7N01-T6 Aluminum Alloy

被引：0
作者：
Chen Y. [1 ]
Song W. [1 ]
Pan S. [2 ]
Liu W. [1 ,3 ]
Song Y. [1 ,3 ]
Zhang H. [1 ,3 ]
机构：
[1] School of Mechanicl Engineering, Hunan University of Science and Technology, Xiangtan
[2] Advanced Research Center, Central South University, Changsha
[3] Hunan Provincial Key Defense Laboratory of High Temperature Wear-resisting Materials and Preparation Technology, Hunan University of Science and Technology, Xiangtan
来源：
Cailiao Daobao/Materials Reports | 2019年 / 33卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Aluminum alloy; Deposited particles; Fatigue crack growth; Microstructure; Stress ratio;
D O I：
10.11896/cldb.18030191
中图分类号：
学科分类号：
摘要：
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•m1/2, 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•m1/2 to 30 MPa•m1/2, 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. © 2019, Materials Review Magazine. All right reserved.
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页码：1697 / 1701
页数：4
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