Grain refinement in an Al-Mg-Sc alloy: Equal channel angular pressing versus friction-stir processing

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:674

Article

Kulitskiy, Vladislav¹  Malopheyev, Sergey¹  Mironov, Sergey²  Kaibyshev, Rustam¹ 

[1] Belgorod State Univ, Lab Mech Properties Nanoscale Mat & Superalloys, Pobeda 85, Belgorod 308015, Russia

[2] Tohoku Univ, Grad Sch Engn, Dept Mat Proc, 6-6-02 Aramaki Aza Aoba, Sendai, Miyagi 9808579, Japan

关键词: Aluminum alloy;    Equal channel angular pressing;    Friction-stir processing;    Ultrafine-grained microstructure;    Microstructure-properties relationship;   

DOI  :  10.1016/j.msea.2016.08.021

来源: Elsevier

【 摘 要 】

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. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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