THE EFFECT OF AGING ON THE HYDROGEN-ASSISTED FATIGUE CRACKING OF A PRECIPITATION-HARDENED AL-LI-ZR ALLOY

被引：11

作者：

CHEN, GS

DUQUETTE, DJ

机构：

[1] Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, 12180-3590, NY

来源：

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1992年 / 23卷 / 05期

关键词：

D O I：

10.1007/BF02647337

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion fatigue behavior of an Al-2.5 pct Li-0. 12 pct Zr alloy has been studied as a function of heat treatment by performing smooth specimen fatigue life experiments on differently aged alloys in dry air and humid nitrogen. Results indicated that aging decreased the fatigue life of the Al-Li-Zr alloy in dry air. However, exposure to water vapor reduced the fatigue resistance of the underaged (UA) alloys but increased the fatigue life of the overaged alloys (OA) alloys. Hydrogen precharging experiments (either exposure to moist air or cathodic charging in HCI solutions) followed by fatigue testing in dry air confirmed that the UA alloys were susceptible to hydrogen embrittlement and that the OA alloys were insensitive to a hydrogen effect. The experimental results suggest that the susceptibility of the Al-Li-Zr alloy to hydrogen-assisted fracture is essentially related to the effectiveness of hydrogen transport to the region ahead of the crack tip, which is controlled by the microstructure of the alloy. Environmental and aging effects which influence the fatigue characteristics of the studied alloy are discussed.

引用

页码：1551 / 1562

页数：12

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