SLM成形AlSi10Mg合金及SiC/AlSi10Mg复合材料的耐蚀和耐磨性能  

Anti-corrosion and wear resistance properties of AlSi10Mg alloy and SiC/AlSi10Mg composites fabricated by selective laser melting

作　　者：丁雪萍 张祺[2] 周崯莹 郭耀旗 唐敏 龚媛 DING Xueping;ZHANG Qi;ZHOU Yinying;GUO Yaoqi;TANG Min;GONG Yuan(School of Material Science and Engineering,Chongqing University of Technology,Chongqing 400054,China;Chongqing Key Laboratory of Additive Manufacturing Technology and Systems,Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China)

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054 [2]中国科学院重庆绿色智能技术研究院智能增材制造技术与系统重庆市重点实验室,重庆400714

出　　处：《材料工程》2024年第10期97-105,共9页Journal of Materials Engineering

基　　金：重庆市教委科学技术研究项目(KJQN202301128)。

摘　　要：利用SLM成形制备SiC/AlSi10Mg复合材料,采用XRD,SEM,EDS,EBSD,电化学方法和摩擦磨损实验分析其物相特征、微观组织和耐蚀、耐磨性能,并与SLM成形AlSi10Mg合金进行对比。结果表明:在3.5%(质量分数)NaCl溶液中,SLM成形SiC/AlSi10Mg试样的腐蚀电流密度(2.0827μA/cm^(2))小于SLM成形AlSi10Mg试样的腐蚀电流密度(3.389μA/cm^(2)),同时SLM成形SiC/AlSi10Mg试样表面钝化膜的厚度(7.1 nm)大于AlSi10Mg试样表面钝化膜的厚度(1.9 nm),说明SLM成形SiC/AlSi10Mg试样耐蚀性能更优。究其原因为,SiC加入后引起晶粒细化、大角度晶界比例增多及铝基体连续性破坏,进而导致腐蚀速率减缓,耐蚀性能增强。此外,与SLM成形AlSi10Mg合金的硬度(103.58±7.41)HV_(0.2)相比,SLM成形SiC/AlSi10Mg复合材料的硬度(207.68±16.02)HV_(0.2)大约是前者的2倍,硬度明显提高,耐磨性能增强;SLM成形AlSi10Mg和SiC/AlSi10Mg的磨损机制均以磨料磨损和氧化磨损为主。The SiC/AlSi10Mg composites were fabricated via selective laser melting(SLM).The phase characteristics,microstructure,anti-corrosion and wear resistance properties of SLM SiC/AlSi10Mg and SLM AlSi10Mg samples were investigated by XRD,SEM,EDS,EBSD,electrochemical test,and friction and wear test.The results show that in the 3.5%(mass fraction)NaCl solution,the corrosion current density of SLM SiC/AlSi10Mg(2.0827μA/cm^(2))is lower than that of SLM AlSi10Mg(3.389μA/cm^(2)),and the passivation film on the surface of SLM SiC/AlSi10Mg(7.1 nm)is thicker than that of SLM AlSi10Mg(1.9 nm),indicating the SLM SiC/AlSi10Mg sample has better corrosion resistance than that of SLM AlSi10Mg.The reason can be attributed to that the addition of SiC causes the grain refinement,the increase of high grain boundary,and the interruption of the continuity of Al matrix,leading to the decrease of corrosion rate and the increase of corrosion resistance.In addition,the average microhardness for SLM SiC/AlSi10Mg composites(207.68±16.02)HV0.2 is twice that of SLM AlSi10Mg alloy(103.58±7.41)HV0.2,indicating its hardness and wear resistance are improved.Both the wear mechanisms of SLM AlSi10Mg and SiC/AlSi10Mg composites are mainly abrasive wear and oxidation wear.

关 键 词：激光选区熔化 SiC/AlSi10Mg复合材料 腐蚀 耐磨性 

分 类 号：TG113.25[金属学及工艺—物理冶金] TB33[金属学及工艺—金属学]