刘丹丹,郭学锋,杨文朋

• 1:河南理工大学材料科学与工程学院
• 2:河南省高性能轻金属材料及数值模拟国际联合实验室

摘要(Abstract)：

采用熔炼法制备了15%Mg_2Si/Al-3%Cu-3%Si复合材料,并研究了热挤压对复合材料的组织及性能的影响。结果表明,铸态15%Mg_2Si/Al-Cu-Si复合材料中初生Mg_2Si相(记为Mg_2Si_p)呈多边形状,且大都具有尖锐的棱角,其尺寸(D_(Mg_2Sip))约为31.24μm,菊花状的共晶Mg_2Si相(记为Mg_2Si_e)偏聚在Mg_2Si_p周围,Al_2Cu相呈不规则的网状。经过460℃固溶处理6 h后,Al_2Cu相明显减少,Mg_2Si_e部分固溶到基体中,部分与Al、Cu元素结合,形成Al_4Cu_2Mg_8Si_7四元Q相。经过往复挤压1道次后,Mg_2Si_p明显破碎,沿挤压流线方向分布,且边缘区域的破碎效果比中心区域更为显著。经过往复挤压1道次和正挤压后,Mg_2Si_p分布均匀,尺寸最小,约为12.89μm,与铸态相比减小了58.7%。随着挤压道次的增加,复合材料组织中的Al_3Cu_2Mg_9Si_7相(Q_1相)逐渐被破碎细化,同时在挤压过程中沿挤压流线析出细小弥散的Al_4CuMg_5Si_4相(Q_2相)。对热挤压后的复合材料进行三点抗弯测试,结果表明,复合材料的强度和塑性大幅度提高。其中,经过往复挤压3道次和正挤压后复合材料的强度和应变分别为306 MPa和6.72%,与铸态相比分别提高了23.9%和482.3%,塑性得到了很大的提高。

关键词(KeyWords)： 15%Mg_2Si/Al-3%Cu-3%Si复合材料;热挤压;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51571086;51271073);; 河南理工大学自然科学基金(B2010-20)

作者(Author): 刘丹丹,郭学锋,杨文朋

DOI: 10.13289/j.issn.1009-6264.2020-0408

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