在线固溶及离线热处理对压铸AZ91D镁合金组织及硬度的影响

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Bibliographic Details
Published in中国有色金属学报：英文版 Vol. 22; no. 11; pp. 2652 - 2658
Main Author 徐玉磊 张奎 李兴刚 雷健 袁海波 刘正
Format Journal Article
LanguageEnglish
Published 2012
Subjects
AZ91合金
β-Al12Mg17相
压铸镁合金
固溶强化
在线固溶
时效处理
离线固溶处理
组织细化
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ISSN1003-6326

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Bibliography:die-cast magnesium alloy; AZ91D alloy; on-line solution; off-line solution treatment; aging treatment; β-Al12Mg17 phases; microstructure refinement; precipitation hardening
XU Yu-lei, ZHANG Kui, LI Xing-gang, LEI Jian, YUAN Hai-bo, LIU Zheng 1. State Key Laboratory for Fabrication and Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing 100088, China; 2. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China; 3. Material Technology Institute of Commercial Vehicle Technical Center, Dongfeng Motor Co., Ltd., Shiyan 442001, China; 4. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
The effects of on-line solution, off-line solution and aging heat treatment on the microstructure and hardness of the die-cast AZ91D alloys were investigated. Brinell hardness of die-cast AZ91D alloy increases through on-line solution and off-line aging treatment but decreases after off-line solution treatment. By X-ray diffractometry, optical microscopy, differential thermal analysis, scanning electron microscopy and X-ray energy dispersive spectroscopy, it is found that the microstructures of the die-cast AZ91D magnesium alloy before and after on-line solution and off-line aging are similar, consisting of α-Mg and β-Al12Mg17. The precipitation of Al element is prevented by on-line solution so that the effect of solid solution strengthening is enhanced. The β-Al12Mg17 phases precipitate from supersaturated Mg solid solution after off-line aging treatment, and lead to microstructure refinement of AZ91D alloy, so the effect of precipitation hardening is enhanced. The β-Al12Mg17 phases dissolve in the substructure after off-line solution treatment, which leads to that the grain boundary strengthening phase is reduced significantly and the hardness of die cast AZ91D is reduced.
43-1239/TG
ISSN:1003-6326