Twinning, recrystallization and texture development during multi-directional impact forging in an AZ61 Mg alloy

被引:142
作者
Jiang, M. G. [1 ,2 ]
Yan, H. [1 ]
Chen, R. S. [1 ]
机构
[1] Chinese Acad Sci, Inst Met Res, Grp Magnesium Alloys & Their Applicat, Shenyang 110016, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
Magnesium alloy; Forging; Twinning; Dynamic recrystallization; Texture; MAGNESIUM SINGLE-CRYSTALS; WIDE TEMPERATURE-RANGE; AL-ZN ALLOY; DYNAMIC RECRYSTALLIZATION; MECHANICAL-PROPERTIES; ROOM-TEMPERATURE; PURE MAGNESIUM; MICROSTRUCTURE; DEFORMATION; COMPRESSION;
D O I
10.1016/j.jallcom.2015.07.281
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Multi-directional impact forging (MDIF) with high strain rate shows high grain refinement efficiency and texture randomization effect in magnesium alloys. AZ61 Mg alloy was subjected to MDIF process, and the related grain refinement mechanisms and texture development were investigated. MDIF resulted in a homogeneous microstructure with fine grains of 11 mu m and non-basal texture, which was ascribed to the consecutive twinning and dynamic recrystallization (DRX). During the early forging passes, twin-induced DRX associated with {10-11} contraction and {10-11}-{10-12} double twins, and the coalescence and intersection of {10-12} extension twins with various variants effectively refined the coarse original grains and randomized the texture. With continuous forging, continuous and discontinuous DRX subsequently took place and eventually led to the fully DRXed microstructure and double-peak texture. Besides, fine spherical beta-Mg17Al12 particles were dynamically precipitated along the original grain boundaries, acting as the preferred nucleation sites for DRX by particle-stimulated nucleation mechanism (PSN). Meanwhile, these particles became effective pinning obstacles for suppressing the DRXed grain growth. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:399 / 409
页数:11
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