SLM成形WC/Al基复合材料的显微组织与力学性能

Effects of Microstructure and Mechanical Properties of SLM Forming WC/Al Matrix Composites

采用物理方法混合纳米WC与AlSi10Mg铝合金粉末,利用选区激光熔化成形技术(SLM)制备WC/Al基复合材料试样。通过金相显微镜、扫描电镜、拉伸试验等对比同种工艺制备的AlSi10Mg试样及WC/Al基复合材料试样的性能,分析纳米WC对其微观组织形成、演变及力学性能的影响。结果发现,复合粉末球形度好,粒度分布均匀。WC/Al基复合材料试样硬度(HV)约为158.9,屈服强度达到337.8 MPa,抗拉强度高达514.0 MPa,相比沉积态试样分别增加了14.6%、4.7%、6.3%。

The composite material powder was fabricated by physically mixing nano-WC and AlSi10 Mg,and a sample was prepared by using a selective laser melting forming machine.The performance of AlSi10 Mg and composite samples prepared by the same process were analyzed comparatively by optical microscope,scanning electron microscope,tensile test,etc.,and the influence of nano-WC on the formation and evolution of microstructure and the influence of the structure on mechanical properties were investigated.The results reveal that composite powder has good sphericity and uniform particle size distribution.The hardness and the yield strength,the tensile strength of the composite sample reach about 158.9 HV and 337.8 MPa,514.0 MPa,which have increased by 14.6%,4.73%and 6.3%,respectively,compared with those of the as-deposited ones.