摘要
本文综述了铝锂合金疲劳的研究进展,包括铝锂合金的疲劳长裂纹、短裂纹、裂纹萌生、光滑和缺口疲劳强度、循环应变行为、过载反应、低温疲劳和腐蚀疲劳、铝锂合金与2000和7000系铝合金疲劳性能的对比、热处理工艺、微观结构、合金成分等对铝锂合金疲劳性能的影响等。
The progress of fatigue research for Al-Li alloys is summarized. The behavior of long and short fatigue cracks, the crack initiation of smooth and notched specimens, the cyclic strain response, the overload effect, the fatigue behavior at cryogenic temperatures and corrosion fatigue of Al-Li alloys are discussed. The comparison of behavior between Al-Li alloys and traditional Al alloys 2000 and 7000-series, the influence of heat treatment, the microstructure and chemical composition on fatigue behavior for Al-Li alloys are presented. The mechanism of crack tip shielding is interpreted in detail. The superior growth resistance of long fatigue cracks for Al-Li alloys is considered to be derived primarily from the crack tip shielding. Because the shielding effect is very sensitive to extrinsic condition, so Al-Li alloys show higher short crack effect, higher anisotropy, larger stress ratio effect and more sensitive overload effect.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1991年第11期A629-A634,共6页
Acta Aeronautica et Astronautica Sinica
关键词
铝锂合金
疲劳
裂纹
强度
Al-Li alloys, fatigue, performace effect
