黄程毅,李乘波,李梦妮,杜军,任月路,刘磊磊,李玲,任瑾萱

• 1:华南理工大学材料科学与工程学院
• 2:广西南南铝加工有限公司广西铝合金材料与加工重点实验室
• 3:广西民族大学材料与环境学院广西先进结构材料与碳中和重点实验室

摘要(Abstract)：

采用光学显微镜、扫描电镜、布氏硬度计、电子万能材料试验机和涡流导电仪等研究了Mg元素含量对Al-2Si-0.8Fe合金的微观组织、力学性能及导电性能的影响。结果表明：随着Mg元素含量的增加，铸态Al-2Si-0.8Fe合金的硬度和抗拉强度不断提高，而对其导电性能的影响相对较小；当Mg含量增至1.5%时，铸态合金的硬度和抗拉强度达到最大值，分别为77.1 HBW和190 MPa,较Al-2Si-0.8Fe合金的硬度(42.3 HBW)和抗拉强度(123.5 MPa)分别提升了82.3%和53.8%,而导电性能的下降幅度控制在2.9%以内。低温退火处理后，合金的导电率有所提升；当Mg含量超过1%时，退火态合金的硬度显著降低，出现退火软化现象；而在Mg含量低于1%时，退火态合金的抗拉强度和硬度并未明显下降，分别达到201.7 MPa和78 HBW,显示出良好的抗退火软化特性。添加少量的Mg后，合金的组织主要由初生α-Al、共晶Mg_2Si相以及长针状β-Al_5FeSi相构成，而随着Mg含量的增加，会发生β-Al_5FeSi→π-Al_8Mg_3FeSi_6反应，导致合金中Mg_2Si强化相数量减少，无法弥补铸态合金固溶强化对硬度的提升效果，从而产生退火软化现象。

关键词(KeyWords)： Al-Si基合金;退火软化;凝固特征曲线;导电率

Abstract:

Keywords:

基金项目(Foundation): 广西科技基地与人才专项(2021AC19272);; 广西民族大学校级引进人才科研项目(2020KJQD04);; 南宁市科学研究与技术开发计划项目(20221017);; 南宁市创新创业领军人才“邕江计划”资助项目(2021006)

作者(Author): 黄程毅,李乘波,李梦妮,杜军,任月路,刘磊磊,李玲,任瑾萱

DOI: 10.13289/j.issn.1009-6264.2023-0327

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