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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 4    August 2003

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Effect of heat-treatment on fatigue property of Al-Li alloy
ZHANG Di(张 荻), DING Jian(丁 剑), FAN Tong-xiang(范同祥), LV Wei-jie(吕维洁), QIN Ji-ning(覃继宁)

State Key Laboratory of Metal Matrix Composites,
Shanghai Jiaotong University, Shanghai 200030, China

Abstract:Fatigue property of Al-Li alloy after various heat treatment was investigated. The results show that the fatigue strength is enhanced with the age hardening progressing. Compared to the solution treated specimen, the fatigue limit is improved to 136% for sub-ageing treated specimen and 155% for peak-ageing treated specimen, respectively. In the meanwhile, the fatigue deformation becomes non-uniform with age hardening progressing. The fatigue cracks initiate and propagate prior from the un-uniform slip band, causing transgranular fracture or the mixed mode of transgranular fracture and intergranular fracture.

 

Key words:  Al-Li alloy; heat treatment; fatigue property

ISSN 1672-7029
CN 43-1423/U

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