Microstructure evolution, mechanical property response and strengthening mechanism induced by compositional effects in Al-6 Mg alloys
Microstructure evolution, mechanical property response and strengthening mechanism induced by compositional effects in Al-6 Mg alloys
复制标题
Al-6Mg合金成分效应引起的显微组织演变、力学性能响应和强化机制
DOI：
10.1016/j.matdes.2022.110849
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发表时间：
2022-08-01
影响因子：
8.4
通讯作者：
Guan, Renguo
中科院分区：
文献类型：
--
作者：
Wang, Yu;Yang, Bowei;Guan, Renguo
基于组份设计理念，通过大挤压比的热挤压变形，获得了强度与延展性结合良好的Al-6 Mg-0.8Mn （-0.2Sc）合金。研究了添加Mn和/或Sc元素后al - 6mg合金的组织演变和力学性能。结果表明：Sc元素的加入使al - 6mg -0.8 mn -0.2Sc合金晶粒细化，促进了纳米Al6Mn相的析出；热挤压后，纳米Al6Mn相数量减少，形貌转变为菱形/片状。纳米Al6Mn相和Al3Sc分散体的联合作用对晶界和位错都有很强的钉住作用，导致再结晶晶粒的显著细化。强化机理分析表明，晶界强化和位错强化对合金屈服强度的提高起着重要作用。此外，固溶体Mg原子的均匀分布和高的再结晶率是挤压合金具有高延展性的原因。本工作的目的是为获得具有优异力学性能的铝镁合金提供一种策略。(C) 2022作者(s)。Elsevier Ltd.出版。
Based on the compositional design concept, an Al-6 Mg-0.8Mn (-0.2Sc) alloy with a good combination of strength and ductility was obtained by hot extrusion deformation with a large extrusion ratio. The microstructure evolution and mechanical property of an Al-6 Mg alloy with adding Mn and/or Sc elements were investigated. The results showed that the addition of Sc element resulted in the grain refinement and promoted the precipitation of nano-sized Al6Mn phases in the Al-6 Mg-0.8Mn-0.2Sc alloy. After hot extrusion, the number of nano-sized Al6Mn phases decreased with the morphology transforming into the rhomboidal/plate-like shape. The combined effect of nano-sized Al6Mn phases and Al3Sc dispersoids offered a strong pinning effect on both grain boundaries and dislocations, leading to a significant refinement for recrystallized grains. Strengthening mechanism analysis indicated that the grain boundary and dislocation strengthening play important roles in enhancing the yield strength of the alloy. In addition, the uniform distribution of solid solution Mg atoms and high recrystallized fraction contributed to the high ductility of the extruded alloy. The aim of this work is to provide a strategy to acquire Al-Mg alloys with excellent mechanical performance. (C) 2022 The Author(s). Published by Elsevier Ltd.