Effect of low temperature on fatigue crack formation and microstructure-scale propagation in legacy and modern Al-Zn-Mg-Cu alloys

被引：31

作者：

Burns, James T. ^{[1
]}

Gupta, Vipul K. ^{[1
,2
]}

Agnew, Sean R. ^{[1
]}

Gangloff, Richard P. ^{[1
]}

机构：

[1] Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA

[2] Natl Inst Aerosp, Hampton, VA 23666 USA

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2013年 / 55卷

关键词：

Fatigue; H-embrittlement; Aerospace aluminum; Crack formation; Small crack growth; INITIAL FLAW SIZES; ALUMINUM-ALLOYS; GROWTH; LIFE; PREDICTION; CORROSION; HYDROGEN;

D O I：

10.1016/j.ijfatigue.2013.06.025

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Temperature dependence of fatigue crack formation and microstructure-scale growth from constituent particles in 7075-T651 and 7050-T7451 is quantified via load induced fracture surface marker-bands. Larger and more abundant particles in 7075-T651 lead to increased crack formation frequency and decreased life. Crack growth rates are similar between alloys and decreased with decreasing temperature, paralleling crack formation behavior. The temperature dependence is attributed to hydrogen environment embrittlement, but is not sufficiently understood to fully model the observed behavior. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：268 / 275

页数：8