ROLE OF HEAT-TREATMENT AND CATHODIC CHARGING CONDITIONS ON THE HYDROGEN EMBRITTLEMENT OF HP-7075 ALUMINUM-ALLOY

被引:17
作者
CHENE, J [1 ]
BERNSTEIN, IM [1 ]
THOMPSON, AW [1 ]
机构
[1] CARNEGIE MELLON UNIV,DEPT MET ENGN & MAT SCI,PITTSBURGH,PA 15213
来源
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1990年 / 21卷 / 02期
关键词
D O I
10.1007/BF02782426
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The response of an equiaxed-grained, high-purity 7075 aluminum alloy to hydrogen as a function of heat treatment and temperature of cathodic charging has been studied. Room-temperature (RT) tensile tests following RT or 120 °C cathodic charging revealed that hydrogen embrittlement susceptibility was dependent on both heat treatment and charging conditions. However, intergranular behavior was only observed following RT charging, limited to a zone a few grains deep from the surface. This fracture appearance has been considered in terms of the possible formation of an aluminum- or magnesium-base hydride at room temperature, compounds which are thermodynamically unstable at the 150 °C charging temperature. Reasons for the observed embrittlement following high-temperature charging are also considered. © 1990 The Minerals, Metals & Materials Society - ASM International - The Materials Information Society.
引用
收藏
页码:455 / 464
页数:10
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