王杰,杨伟,应国民,徐勇

• 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)：

采用真空感应熔炼、铜模喷铸和时效处理相结合的方法，研究了不同冷速条件下Al-4.73Mg-0.71Sc-0.33Zr合金的凝固组织演化规律及其析出相的析出行为。结果表明：铸态合金组织由粗大的α-Al基体和Al_3(Sc, Zr)微米颗粒组成；经铜模喷铸后，非平衡凝固(快冷)合金的平均晶粒尺寸由铸态的250μm显著下降至7.5μm,同时Al_3(Sc, Zr)颗粒相的生长受到抑制；快冷合金经300℃时效45 min后，析出大量纳米Al_3(Sc, Zr)相，合金显微硬度由79.86 HV0.2提高至121.95 HV0.2,相比原始快冷合金提高52.70%。

关键词(KeyWords)： Al-4.73Mg-0.71Sc-0.33Zr合金;非平衡凝固;时效析出;显微硬度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52061032,52261014);; 江西省教育厅资助项目(DA202203113)

作者(Author): 王杰,杨伟,应国民,徐勇

DOI: 10.13289/j.issn.1009-6264.2023-0370

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