球磨-转喷微注法制备纳米Al2O3颗粒/Al(7075)复合材料的组织及磨损特性  

Microstructure and wear properties of nano-AlO/Al(7075) composites fabricated by ball milling-spray-stirring process

作　　者：吴瑞瑞 丁福帅 李秋书[2] 王荣峰[2] 孙龙宇 WU Ruirui;DING Fushuai;LI Qiushu;WANG Rongfeng;SUN Longyu(Analysis and Testing Center,Taiyuan University of Science and Technology,Taiyuan 030024,China;School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Jiangling Heavy Vehicle Co.Ltd.,Taiyuan 030024,China)

机构地区：[1]太原科技大学分析测试中心,太原030024 [2]太原科技大学材料科学与工程学院,太原030024 [3]江铃重型汽车有限公司,太原030024

出　　处：《复合材料学报》2020年第10期2512-2517,共6页Acta Materiae Compositae Sinica

基　　金：山西省高等学校科技创新项目(2019L0620);博士启动基金项目(20182032);来晋工作优秀博士奖励资金(20192027)。

摘　　要：采用球磨-转喷微注相结合的新工艺制备纳米Al2O3颗粒(Al2O3p)/Al(7075)复合材料,设计一种转喷微注装置,该装置能将连续、微量的纳米Al2O3p注入到Al熔体中。观察纳米Al2O3增强相对Al(7075)基体合金材料微观组织的影响,并测试Al(7075)基体和纳米Al2O3p/Al(7075)复合材料的磨损特性。对纳米Al2O3p/Al(7075)复合材料和Al(7075)基体在不同载荷(15 N、25 N和35 N)下的磨损特性进行对比研究。结果表明:球磨-转喷微注法制备的纳米Al2O3p/Al(7075)复合材料晶粒较小,且增强相在基体中分布均匀且结合良好;随着载荷增大,纳米Al2O3p/Al(7075)复合材料磨损量的上升趋势慢于Al(7075)基体。载荷为35 N时,纳米Al2O3p/Al(7075)复合材料的磨损量较Al(7075)基体少,磨屑尺寸较小,其耐磨性能明显改善,这主要得益于纳米Al2O3p的支撑作用和材料的细晶强化作用。The new way of the ball milling-spray-stirring process was used to fabricate nano-Al2O3particle(Al2O3p)/Al(7075) composites and the spray-stirring device was designed which can inject continuously a spot of nano-Al2O3p into the Al melt. The effect of nano-Al2O3p reinforcement on the microstructure of Al(7075) matrix alloy was observed, and the wear characteristics of Al(7075) matrix and nano-Al2O3p/Al(7075) composites were tested. The wear characteristics of the nano-Al2O3p/Al(7075) composites and Al(7075) matrix were measured at various loads(15 N, 25 N and 35 N). The results show the nano-Al2O3p/Al(7075) composites appears as fine grain, and the distribution of the reinforcement in the matrix is uniform, and well bonded with the matrix. As the load increasing, the wear lose of the nano-Al2O3p/Al(7075) composites is slower than the Al(7075) matrix. When the load is 35 N,the nano-Al2O3p/Al(7075) composites exhibite smaller wear width and wear debris. The improvement of the wear resistance of the nano-Al2O3p/Al(7075) composites occurs mainly by supporting of the Al2O3p and strengthening of the fine-grain.

关 键 词：7075铝合金 纳米Al2O3p 复合材料 磨损性能 微观组织 

分 类 号：TB331[一般工业技术—材料科学与工程]