Sc元素对激光选区熔化TiB2/AlSi10Mg复合材料组织和性能的影响  

Effect of Sc element on microstructure and properties of selective laser melted TiB/AlSi10Mg composite

作　　者：刘宇轩 王日初[1,2] 蔡志勇[1] 周朝辉 李晓庚 曹玄扬 Liu Yuxuan;Wang Richu;Cai Zhiyong;Zhou Zhaohui;Li Xiaogeng;Cao Xuanyang(School of Materials Science and Engineering,Central South University,Changsha Hunan 410083,China;Hunan Key Laboratory of Electronic Packaging and Advanced Functional Materials,Central South University,Changsha Hunan 410083,China;Changsha Advanced Materials Industrial Research Insititute,Changsha Hunan 410205,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中南大学电子封装与先进功能材料湖南省重点实验室,湖南长沙410083 [3]长沙新材料产业研究院有限公司,湖南长沙410205

出　　处：《金属热处理》2020年第8期56-63,共8页Heat Treatment of Metals

摘　　要：采用稀土元素Sc对激光选区熔化TiB2/AlSi10Mg复合材料进行变质处理,借助场发射扫描电镜、电子探针显微分析仪、显微硬度计以及电子万能试验机等,分别研究了添加Sc元素和固溶时效热处理对复合材料显微组织、密度和力学性能的影响。结果表明:与TiB2/AlSi10Mg复合材料相比,Sc元素的加入可以进一步细化Al-Si共晶,产生细晶强化和弥散强化作用,Ti B2/AlSi10MgSc复合材料的抗拉强度和显微硬度分别提升了56.7 MPa (14.4%)和15.3 HV0.1 (11.3%)。激光选区熔化Ti B2/AlSi10MgSc复合材料的硬度和强度随着固溶温度升高而逐渐降低,但伸长率得到明显改善。TiB2/AlSi10Mg composite modified by rare earth element Sc was prepared by selective laser melting( SLM).Effect of element Sc on the microstructure,density,and properties of the composite was studied by using field emission scanning electron microscope,electron probe microanalyzer,micro-hardness tester and electronic universal testing machine.The results show that compared with TiB2/AlSi10Mg composite,the addition of rare earth Sc can further refine the Al-Si eutectic,resulting in fine-grained strengthening and dispersion strengthening.The ultimate tensile strength and microhardness of TiB2/AlSi10MgSc composite are increased by 56.7 MPa( 14.4%) and15.3 HV0.1( 11.3%),respectively.The hardness and the strength of the selective laser melted TiB2/AlSi10MgSc composite are gradually decreased with the increase of solution temperature,but its elongation is significantly improved.

关 键 词：激光选区熔化 铝基复合材料 Sc元素 细晶强化 弥散强化 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]