摘要
研究了εｔａ＝０．８５１２％总应变幅下７０７５ＲＲＡ铝合金的低周疲劳行为。讨论了应变疲劳位错结构与累积形变之间的关系，进而初步分析了疲劳裂纹的萌生机理，并用循环显微软化／硬化的竞争机制解释了７０７５ＲＲＡ铝合金的宏观循环稳定化行为。
The low cycle fatigue behavior of 7075 RRA alloy with a total strain amplitude of ε ta =0.851 2% was studied, the relationship between the dislocation substructure of strain fatigue and the accumulated deformation was discussed, consequently the initiation mechanism of fatigue cracks was preliminarily analysed. In addition, the macro cyclic stabilization behavior of 7075 RRA alloy was explained using the cyclic micro softening/hardening competitive mechanism.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
1997年第4期79-83,共5页
The Chinese Journal of Nonferrous Metals
关键词
铝合金
应变疲劳
位错
裂纹
锌
镁
铜
RRA aluminium alloy strain fatigue dislocation substructure crack
