周珍珍,杨伟,陈寿辉,徐志锋,余欢

• 1:南昌航空大学轻合金加工科学与技术国防重点学科实验室

摘要(Abstract)：

采用铜模喷铸技术制备出AZ91D镁合金非平衡凝固试样,并对其热稳定性进行了研究。采用光学显微镜、扫描电镜、能谱分析仪及维氏显微硬度计对不同温度热处理镁合金的晶粒形貌、溶质含量及显微硬度变化进行对比研究。实验结果表明,当热处理温度200℃,保温时间240 min时,晶粒形貌未发生明显变化,但由于时效效应的存在,导致过饱和α-Mg固溶体中沉淀相析出,Al元素溶质含量有所下降,合金显微硬度略有升高。相同保温时间条件下,随热处理温度升高,β-Mg17Al12共晶相体积分数不断降低,固溶到基体中导致Al元素含量增加。与此同时,初生α-Mg相晶界逐渐清晰并发生明显的晶粒长大现象,合金显微硬度呈整体下降趋势。

关键词(KeyWords)： 镁合金;非平衡凝固;热稳定性;显微硬度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51164028);; 轻合金加工科学与技术国防重点学科实验室开放课题(GF201201003)

作者(Author): 周珍珍,杨伟,陈寿辉,徐志锋,余欢

DOI: 10.13289/j.issn.1009-6264.2014.10.003

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