(中國有色金屬工業(yè)總公司科技部， 北京 100814)
摘 要: 研究了εta=0.8512%總應(yīng)變幅下7075-RRA鋁合金的低周疲勞行為。討論了應(yīng)變疲勞位錯(cuò)結(jié)構(gòu)與累積形變之間的關(guān)系，進(jìn)而初步分析了疲勞裂紋的萌生機(jī)理，并用循環(huán)顯微軟化/硬化的競爭機(jī)制解釋了7075-RRA鋁合金的宏觀循環(huán)穩(wěn)定化行為。
關(guān)鍵字: 鋁合金 應(yīng)變疲勞 位錯(cuò) 裂紋
（Department of Science and Technology Development,
China National Nonferrous Metals Industry Corporation, Beijing 100814）
Abstract:The low-cycle fatigue behavior of 7075-RRA alloy with a total strain amplitude of εta=0.8512% 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.
Key words: 7075-RRA aluminium alloy strain fatigue dislocation substructure
