TiB_(2)/Mg-4Al-xSi镁基复合材料的耐磨性能研究  

Study on the Wear Resistance of TiB_2/Mg-4Al-xSi Magnesium Matrix Composites

作　　者：刘健 赵宇 王武孝[2] 何娜 龚航 LIU Jian;ZHAO Yu;WANG Wu-xiao;HE Na;GONG Hang(Faculty of Printing,Packaging Engineering and Digital Media Technology,Xi′an University of Technology,Xi′an 710054,Shaanxi,China;School of Materials Science and Engineering,Xi′an University of Technology,Xi′an 710048,Shaanxi,China)

机构地区：[1]西安理工大学印刷包装与数字媒体学院,陕西西安710054 [2]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《铸造》2024年第11期1548-1553,共6页Foundry

基　　金：国家自然科学基金面上项目(52275377)。

摘　　要：细化Mg_(2)Si相是提高Mg-Al-Si合金强度和韧性的重要措施,以TiB_(2)纳米颗粒作为Mg_(2)Si的异质形核剂,采用半固态搅拌结合熔体超声处理法将TiB_(2)纳米颗粒加入Mg-4Al-x Si(x=0.5,1.0,1.5,2.0)(质量分数,下同)合金熔体中,制备出TiB_(2)与Mg_(2)Si混杂增强镁基复合材料。利用光学显微镜和扫描电镜观察了复合材料中Mg_(2)Si相的形貌和尺寸,采用图像分析软件Image-J统计分析了Mg_(2)Si相的体积分数,重点研究了不同Si含量复合材料的耐磨性能。结果表明,TiB_(2)纳米颗粒的加入显著细化了Mg-4Al-x Si(x=0.5,1.0,1.5,2.0)合金中的共晶Mg_(2)Si相和初生Mg2Si相,显著提高了合金的硬度和耐磨性。随着Si含量的增加,TiB_(2)/Mg-4Al-xSi(x=0.5,1.0,1.5,2.0)复合材料的耐磨性能先升高后降低,当Si含量为1.5%时耐磨性能最佳。It is a crucial measure to refine Mg_(2Si)phases for improving the strength and ductility of Mg-Al-Si alloys.In present study,TiB_(2)nanoparticles were selected as heterogeneous nucleating agents for Mg_(2Si)and introduced into Mg-4Al-xSi(x=0.5,1.0,1.5,2.0)alloy melts using mechanical stirring in the semi-solid state followed by ultrasonic treatment,and TiB_(2)and Mg_(2Si)hybrid reinforced magnesium matrix composites(TiB_2/Mg-4Al-xSi(x=0.5,1.0,1.5,2.0))were prepared consequently.The morphology and size of the Mg_(2Si)phase in the composites were observed using optical microscopy and scanning electron microscopy,and the volume fraction of the Mg_(2Si)phase was statistically analyzed using image analysis software Image-J,focusing on the wear-resistant properties of the composites with different Si contents.The results showed that the incorporation of TiB_(2)nanoparticles significantly refined the eutectic Mg_(2Si)phase and primary Mg_(2Si)phase in the composites,and significantly improved the hardness and wear resistance of the composites.The wear resistance of the composites increased and then decreased with the increase of Si content and reached when Si content is 1.5 wt.%.

关 键 词：镁基复合材料 MG_2SI TiB_2纳米颗粒 磨损率 磨损机制 

分 类 号：TG146.22[一般工业技术—材料科学与工程]