The fatigue crack behavior of 7N01-T6 aluminum alloy in different particle environments

被引：4
作者：
Chen, Y. Q. [1 ]
Tang, Z. H. [1 ]
Pan, S. P. [2 ]
Liu, W. H. [1 ]
Song, Y. F. [1 ]
Zhu, B. W. [1 ]
Liu, Y. [1 ]
Wen, Z. L. [3 ]
机构：
[1] Hunan Univ Sci & Technol, Hunan Prov Key Lab New Energy Storage & Convers A, Xiangtan 411201, Peoples R China
[2] Cent South Univ, Adv Res Ctr, Changsha 410083, Peoples R China
[3] Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 528000, Peoples R China
来源：
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING | 2020年 / 20卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Aluminium alloys; Fatigue crack growth; Particles; Crack closure; Microstructure; FRACTURE-TOUGHNESS; GROWTH-BEHAVIOR; LOW-TEMPERATURE; INCLUSION SIZE; GRAIN-SIZE; MICROSTRUCTURE; PROPAGATION; THRESHOLDS; CORROSION; EXPOSURE;
D O I：
10.1007/s43452-020-00131-0
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
An experimental method of evaluating the fatigue behavior of alloys in different particle environments was designed, and the effects of four kinds of particles (i.e., graphite, CaO, Al2O3, and MnO2) on the crack propagating behavior of 7N01-T6 behaviour alloys were investigated. The results show that the particles deposited on the crack surface exert significant influence on the fatigue crack propagation behavior thereof. This influence strongly depends on the elastic moduli of the particles (E-p). AsE(p)is less than that of aluminium alloy (E-Al), the particle accelerates the fatigue-crack-growth rate (FCGR) in the alloys due to the lubrication of the particles on the mating fracture surfaces. When the difference betweenE(p)andE(Al)is small, the particle effect on the FCGRs of the alloys is small due to the counteraction between the decrease in friction and the promotion on the crack closure of mating fracture surfaces. WhenE(p)is greater thanE(Al), the particles slow down the FCGRs of the alloys on account of significant crack closure effect. AsE(p)is much greater thanE(Al), the particles increase the FCGRs because of the increasing stress concentration at the crack tip.
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页数：16
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