The effect of frequency and microstructure on corrosion fatigue crack propagation in high strength aluminium alloys

被引：48

作者：

Gingell, ADB ^{[1
]}

King, JE ^{[1
]}

机构：

[1] UNIV CAMBRIDGE,DEPT MAT SCI & MET,CAMBRIDGE CB2 3QZ,ENGLAND

来源：

ACTA MATERIALIA | 1997年 / 45卷 / 09期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1016/S1359-6454(97)00033-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fatigue crack growth in high strength aluminium alloy 7150 commercial plate material has been studied in both laboratory air and acidified aqueous salt solution. The aggressive aqueous environment enhanced fatigue crack growth rates by up to an order in magnitude compared to laboratory air. The enhancement in fatigue crack growth rate was accompanied by evidence of embrittlement in the crack path, involving both brittle intergranular and transgranular failure modes. Both the enhancement of fatigue crack growth rates and the extent of intergranular growth modes are dependent on cyclic frequency which, along with the absence of a similar frequency effect in a spray-formed version of the material with a significantly different grain structure, supports a mechanism of grain boundary hydrogen diffusion for at high Delta K in both spray formed and conventional plate materials coincides with the operation of identical transgranular corrosion fatigue modes dependent on strain-controlled hydrogen diffusion ahead of the crack tip. (C) 1997 Acta Metallurgica Inc.

引用

页码：3855 / 3870

页数：16

共 55 条

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