Grain refinement in an Al-Mg-Sc alloy: Equal channel angular pressing versus friction-stir processing
Grain refinement in an Al-Mg-Sc alloy: Equal channel angular pressing versus friction-stir processing
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DOI：
10.1016/j.msea.2016.08.021
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发表时间：
2016-09
期刊：
影响因子：
6.4
通讯作者：
V. Kulitskiy;S. Malopheyev;S. Mironov;R. Kaibyshev
中科院分区：
文献类型：
--
作者：
V. Kulitskiy;S. Malopheyev;S. Mironov;R. Kaibyshev
直接比较了等通道角挤压（ECAP）和搅拌摩擦处理（FSP）对Al-Mg-Sc合金晶粒细化的效率。基于详细的显微组织检查，量化了两种加工技术的显微组织-强度关系。与ECAP相比，FSP制备的细晶材料具有晶粒和弥散尺寸更粗、位错密度更低、织构更不规则、高角边界分数更高、强度更低的特点。FSP的晶粒细化和强度提高效率较低，主要原因是加工温度较高，冷却速度较慢。
The efficiencies of equal channel angular pressing (ECAP) and friction-stir processing (FSP) for grain refinement in an Al-Mg-Sc alloy were directly compared. Based on detailed microstructural examinations, microstructure-strength relationships for both processing techniques were quantified.In contrast to ECAP, the fine-grained material produced by FSP was found to be characterized by a coarser grain- and dispersoid size, lower dislocation density, more irregular texture, higher high-angle boundary fraction and lower strength. The comparatively low efficiency of FSP for grain refinement and enhancement of strength was attributed to the relatively high processing temperature and the relatively low cooling speed.