Strain-induced dissolution of Cu–Mg co-clusters and dynamic recrystallization near a fatigue crack tip of an underaged Al–Cu–Mg alloy during cyclic loading at ambient temperature

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• 作者：Song Bai^a ; ^b ; Zhiyi Liu ; ^a ; ^b ; ^{liuzhiyi335@163.com} ; ^{liuzhiyi@mail.csu.edu.cn} ; Xuanwei Zhou^a ; ^b ; Yanxia Gu^a ; ^b ; Dier Yu^a ; ^b
• 关键词：Fatigue ; Dynamic recrystallization ; Dislocation ; Cu– ; Mg co-clusters
• 刊名：Scripta Materialia
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：64
• 期：12
• 页码：1133-1136
• 全文大小：728 K

文摘

The microstructure evolution near a fatigue crack tip of an underaged Al–Cu–Mg alloy indicated that cyclic deformation around the crack tip was a kind of severe localized plastic deformation. It was first revealed that the dissolution of Cu–Mg co-clusters was directly related to the repeated cutting by moving dislocations as intense localized cyclic straining at the fatigue crack tip was applied. A transition from the dislocation tangles to subgrains, which was associated with room-temperature dynamic recrystallization, was also confirmed.