程婷,赵英,秦纪康,伍复发,武晓峰

• 1:南昌工学院机械与车辆工程学院
• 2:辽宁工业大学材料科学与工程学院

摘要(Abstract)：

研究了不同Mg含量对含10 mass%Mg_2Si的亚共晶Al-Mg-Si合金显微组织、拉伸性能和断裂行为的影响。结果表明：在合金中添加1.2～2.8 mass%的Mg能够减小初生α-Al枝晶的尺寸，适量的Mg明显地细化了合金中的Mg_2Si共晶相，并使其形貌由粗大的汉字状转变为短条状、颗粒状和纤维状。共晶Mg_2Si的细化归因于Mg原子团簇在其两侧的富集，抑制了共晶Mg_2Si的生长，促进了其生长方向的改变。适量的Mg的添加同时提高了合金的强度和塑性，添加2.8 mass%Mg的合金拉伸性能达到最高，抗拉强度、屈服强度和伸长率分别由未添加Mg的232.4 MPa、150.4 MPa和1.5%增加到322.0 MPa、270.4 MPa和6.1%,分别提高了38.6%、79.8%和306.7%。未添加Mg的合金的断裂机制为脆性断裂，添加2.8 mass%Mg的合金的断裂机制转变为韧性断裂。

关键词(KeyWords)： Al-Mg-Si合金;Mg;共晶Mg_2Si;初生α-Al枝晶;拉伸性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51971106);; 江西省教育厅科技项目(GJJ2202921,GJJ2202905)

作者(Author): 程婷,赵英,秦纪康,伍复发,武晓峰

DOI: 10.13289/j.issn.1009-6264.2023-0546

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