期刊
CORROSION REVIEWS
卷 35, 期 4-5, 页码 275-290出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/corrrev-2017-0037
关键词
aluminum alloys; corrosion; fracture; stress corrosion cracking
资金
- Office of Naval Research [ONR-N00012-14-1-0593]
Two distinct modes of environment-induce cracking (EIC) can initiate in AA5083-H131 during slow strain rate testing (SSRT) in laboratory air (50% RH) at nominal strain rates around 10(-6)/s, for material either sensitized in distilled water (DW) at 80 degrees C or when material sensitized in dry air is subsequently pre-exposed to DW at room temperature. Type-1 EIC is the classic form of intergranular stress corrosion cracking (IGSCC), which during SSRT in laboratory air, initiates at intergranular corrosion (IGC) sites promoted during exposure to DW and provides the prerequisite local stress intensity factor of around 5 MNm(-3/2) required for crack initiation. When Type-1 EIC cracks become sufficiently deep for local plane- strain stress intensity factors to exceed 12-15 MNm(-3/2), Type-2 EIC initiation triggers a series of sudden large load-drops and SSRT failures with extremely low fracture stresses (30-65 MPa). Pre-exposure to DW at room temperature can enhance propensity to both Type-1 and Type-2 EIC. SSRT in dry air, as opposed to humid laboratory air, exhibits failure consistently as a 45 degrees slant failure via a predominantly ductile microvoid coalescence fracture mode, with Type-1 EIC very rarely initiating and any Type-2 EIC restricted to isolated internal patches that only form when relative elongations exceed similar to 9%.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据