MECHANISMS OF STRESS-CORROSION CRACKING AND LIQUID-METAL EMBRITTLEMENT IN AL-ZN-MG BICRYSTALS

被引：24

作者：

LYNCH, SP

机构：

[1] Dep of Defence, Aeronautical, Research Lab, Melbourne, Aust, Dep of Defence, Aeronautical Research Lab, Melbourne, Aust

来源：

JOURNAL OF MATERIALS SCIENCE | 1985年 / 20卷 / 09期

关键词：

BICRYSTALS - BRITTLE INTERCRYSTALLINE FRACTURES - INTERCRYSTALLINE CRACKING - LIQUID-METAL EMBRITTLEMENT;

D O I：

10.1007/BF00545203

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Metallographic and fractographic studies of intercrystalline fracture in high-purity Al-6Zn-3Mg bicrystals in inert, liquid metal, and water environments are described. The effects of variations in grain-boundary microstructure on fracture and the effects of cathodically charging specimens with hydrogen prior to testing in inert environments were also investigated. Mechanisms of liquid-metal embrittlement, stress-corrosion cracking and pre-exposure embrittlement are discussed in the light of these results. The observations suggest that liquid-metal embrittlement and stress-corrosion cracking generally occur by a plastic-flow/microvoid-coalescence process that is more localized than that which occurs in inert environments. It is proposed that adsorbed liquid metal or hydrogen atoms weaken interatomic bonds at crack tips, thereby facilitating the nucleation of dislocations and promoting the coalescence of cracks with voids.

引用

页码：3329 / 3338

页数：10

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