B_(4)C/AlSi10Mg复合材料激光选区熔化成形工艺及性能研究

Study of the Processes and Properties of B_(4)C/AlSi10Mg Composites Formed via Selective Laser Melting

颗粒增强铝基复合材料因其卓越的综合性能而备受关注,选区激光熔化技术为复合材料的制备提供了新的路径。采用SLM技术成形不同含量B_(4)C颗粒增强AlSi10Mg复合材料,研究了成形工艺参数(激光功率、扫描速度和扫描间距)对成形件显微组织、致密度和力学性能的影响规律。结果表明,B_(4)C/AlSi10Mg复合材料试样内部孔洞和裂纹较少,B_(4)C颗粒在铝基体中分布均匀,与AlSi10Mg基体有良好的结合。在激光功率240 W,扫描速度1400 mm/s,扫描间距0.13 m的工艺条件下,3%B_(4)C/AlSi10Mg(质量分数)复合材料致密度最高达到99.39%。当B_(4)C颗粒含量提高至5%时,尽管硬度有所提升,但致密度、抗拉强度及断裂伸长率均有下降。

Particle-reinforced aluminium-based composites are gaining attention for their excellent overall performance,and selective laser melting(SLM)provides a new path for the fabrication of these materials.SLM was used to form AlSi10Mg composites with different contents of B_(4)C particles.The effects of different forming process parameters(laser power,scanning speed and scanning spacing)on the microstructure,density and mechanical properties of the formed parts were studied.The results show that the B_(4)C/AlSi10Mg composites exhibit fewer internal voids and cracks,with a uniform distribution of B_(4)C particles in the aluminium matrix and good bonding between the B_(4)C particles and the AlSi10Mg matrix.The density of the 3 wt.%B_(4)C/AlSi10Mg composite material reaches 99.39%with a laser power of 240 W,a scanning speed of 1400 mm/s,a powder thickness of 0.03 mm and a scanning spacing of 0.13 mm.When the B_(4)C particle content is increased to 5 wt.%,although the hardness is improved,the density,tensile strength and elongation are reduced.