Deformation structures and strengthening mechanisms in an AlMgScZr alloy

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• 作者：S. Malopheyev ; ^{malofeev@bsu.edu.ru} ; V. Kulitskiy ^{kulitskiy@bsu.edu.ru} ; R. Kaibyshev ^{rustam_kaibyshev@bsu.edu.ru}
• 关键词：Aluminum alloys ; Equal-channel angular pressing ; Grain refinement ; Mechanical characterization ; Grain boundaries ; Strengthening mechanisms
• 刊名：Journal of Alloys and Compounds
• 出版年：2017
• 出版时间：25 March 2017
• 年：2017
• 卷：698
• 期：Complete
• 页码：957-966
• 全文大小：5797 K
• 卷排序：698

文摘

ECAP at 573 K provided a +140% increase in the yield stress of AlMgScZr alloy. The strengthening mechanisms are discussed in the relationship between the deformation structure and the YS. The increment of yield stress takes place due to intensive grain refinement and increase of dislocation density. Effect of ECAP on yield stress is described by the “composite” Hall-Petch relationship σ0.2=155+αMGbρ1/2+0.11×dGB−1/2.