徐玉磊,张奎,李兴刚,雷健,袁海波

• 1:北京有色金属研究总院有色金属制备加工国家重点实验室
• 2:内蒙古科技大学材料与冶金学院
• 3:东风汽车有限公司商用车技术中心工艺研究所

摘要(Abstract)：

研究在线淬火、离线固溶处理(420℃×1 h在水中快冷)和时效处理(190℃×4 h空冷)对压铸AZ91D镁合金组织及硬度的影响。结果表明:在线淬火和离线的时效处理可提高压铸AZ91D合金的布氏硬度,但是离线固溶处理使合金硬度下降;在线淬火和时效处理后合金的组织与压铸AZ91D基本相同,仍由α-Mg及β-Al12Mg17组成。在压铸镁合金冷却过程中在线淬火使温度急剧降低,增强了Al元素固溶强化的效果;而时效处理通过Al12Mg17分解后重新析出并细化了晶粒,增强了细晶强化的效果。离线的固溶处理Al12Mg17分解后虽然固溶强化效果增强但是晶界强化相大幅减少,导致合金硬度降低。

关键词(KeyWords)： 压铸镁合金;在线淬火;固溶处理;时效强化

Abstract:

Keywords:

基金项目(Foundation): 国家“十二五”科技支撑计划资助项目(2011BAE22B01,2011BAE22B06);; 内蒙古科技大学创新基金项目(2010NC018)

作者(Author): 徐玉磊,张奎,李兴刚,雷健,袁海波

DOI: 10.13289/j.issn.1009-6264.2012.11.014

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