The Effect of Loading Rate on the Environment-Assisted Cracking Behavior of AA7075-T651 in Aqueous NaCl Solution

被引：12

作者：

Harris, Zachary D. ^{[1
]}

Burns, James T. ^{[1
]}

机构：

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

来源：

CORROSION AND MATERIALS DEGRADATION | 2021年 / 2卷 / 03期

基金：

美国国家航空航天局;

关键词：

Al-Mg-Zn-Cu; aluminum; environment assisted cracking; EAC; loading rate; STRESS-CORROSION CRACKING; CU ALUMINUM-ALLOYS; SCC GROWTH-RATES; STRAIN-RATE TEST; HYDROGEN EMBRITTLEMENT; HEAT-TREATMENT; FRACTURE-TOUGHNESS; STAINLESS-STEEL; COPPER CONTENT; STRENGTH;

D O I：

10.3390/cmd2030019

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of loading rate on the environment-assisted cracking (EAC) behavior of AA7075-T651 immersed in 0.6 and 1.0 M NaCl solution was assessed at applied potentials ranging from -800 to -1200 mVSCE via a slow-rising stress intensity (K) testing methodology. Measured crack growth rates under rising K loading are compared to those obtained using a fixed K protocol, which revealed that rising K-based testing consistently yields increased crack growth rates relative to static K approaches across all tested conditions. However, relative to other alloy systems, EAC in AA7075-T651 is only modestly loading rate-dependent, as demonstrated by testing conducted at fixed dK/dt ranging from 0.25 to 2.0 MPa root m/h. The implications of the observed results are considered in the context of current EAC testing specifications, with specific focus on the conservatism and efficiency of rising K-based approaches.

引用

页码：360 / 375

页数：16