SLM成形(TiN+SiC)/AlSi_(7)Cu_(2)Mg复合材料的组织及力学性能  

Microstructure and Mechanical Properties of(TiN+SiC)/AlSi_(7)Cu_(2)Mg Composites Formed by SLM

作　　者：王保华[1] 葛新锋 杨波[3] 胡草笛 Wang Baohua;Ge Xinfeng;Yang Bo;Hu Caodi(School of Mechanical and Electrical Engineering,Jiaozuo University,Jiaozuo,Henan,454000 China;Engineering Technology Center,Xuchang University,Xuchang,Henan 461000,China;School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo,Henan 454003,China)

机构地区：[1]焦作大学机电工程学院 [2]许昌学院工程技术中心 [3]河南理工大学机械与动力工程学院

出　　处：《应用激光》2022年第7期59-64,共6页Applied Laser

基　　金：河南省高等学校优秀基层教学组织(教高[2017]730号);河南省科技厅科技攻关项目(182102210508)。

摘　　要：选择AlSi_(7)Cu_(2)Mg作为测试基材,采用纳米级TiN颗粒与亚微米级SiC作为增强体,将各成分混合并经过SLM处理制得TiN/SiC铝复合材料,对材料基体组织结构及其力学性能开展了分析。研究结果表明,在AlSi_(7)Cu_(2)Mg试样的表层形成了大量的微孔并发生组织球化的转变过程。而3.5%SiC/AlSi_(7)Cu_(2)Mg与1.5%TiN/3.5%SiC/AlSi_(7)Cu_(2)Mg则形成了光滑的表面结构。测试发现存在Si、Al、Mg_(2)Si与SiC四种物相成分,只形成了少量Al_(4)C_(3)。1.5%TiN/3.5%SiC/AlSi_(7)Cu_(2)Mg中形成了细小的晶粒,形成了明显不同的晶粒取向排布形态,存在大量小尺寸等轴晶,粒径均值只有4.15μm,晶粒最大为13μm。测试1.5%TiN/3.5%SiC/AlSi_(7)Cu_(2)Mg抗拉强度为486 MPa,伸长率为9.8%,相对SLM工艺制得的AlSi_(7)Cu_(2)Mg试样都提升了近20%,在断口部位形成了明显河流状纹路。AlSi_(7)Cu_(2)Mg was selected as the test substrate,nano TiN particles and sub-micron SiC were used as reinforcement,and the TiN/SiC aluminum composite was prepared by SLM treatment.The microstructure and mechanical properties of the material matrix were analyzed.Results show that a large number of micropores are formed on the surface of AlSi_(7)Cu_(2)Mg sample and the spheroidization of tissue took place.However,3.5%SiC/AlSi_(7)Cu_(2)Mg and 1.5%TiN/3.5%SiC/AlSi_(7)Cu_(2)Mg form smooth surface structure.It is found that there are four phases of Si,Al,MgSi and SiC,and only a small amount of AlCis formed.Fine grains are formed in 1.5%TiN/3.5%SiC/AlSi_(7)Cu_(2)Mg,and obviously different grain orientation and configuration are formed.There are a large number of small equiaxed grains with average size of 4.15μm and maximum size of 13μm.The tensile strength and elongation of 1.5%TiN/3.5%SiC/AlSi_(7)Cu_(2)Mg samples are 486 MPa and 9.8%,respectively.Compared with the AlSi_(7)Cu_(2)Mg samples prepared by SLM process,the tensile strength and elongation of 1.5%TiN/3.5%SiC/AlSi_(7)Cu_(2)Mg samples are nearly 20%higher than those prepared by SLM process,and obvious river grain is formed at the fracture site.

关 键 词：激光选区熔化 混杂颗粒 铝基复合材料 强化机制 

分 类 号：TB311[一般工业技术—材料科学与工程]