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B4C/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 B4 C/AlSi10Mg Composites Formed via Selective Laser Melting
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- DOI:
- 作者:
- 洛 毅，汪志太，胡耀政，徐志锋，刘奋成，张守银，刘丰刚
LUOYi, WANGZhitai, HU Yaozheng, XU Zhifeng, LIU Fencheng, ZHANG Shouyin, LIU Fenggang
- 作者单位:
- 南昌航空大学轻合金加工科学与技术国防重点学科实验室，江西南昌330063
National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China
- 关键词:
- 选区激光熔化；B4 C/AlSi10Mg复合材料；显微组织；力学性能
selective laser melting; B4 C/AlSi10Mg composites; microstructure; mechanical properties
- 摘要:
- 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B4 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，B4 C/AlSi10Mg复合材料试样内 部孔洞和裂纹较少，B4 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 1 400 mm/s，扫描间距0.13m的工艺条件下，3%B4 C/AlSi10Mg(质量分数)复合材料致密度最高达到99.39%。 当B4 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 B4 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 B4 C/AlSi10Mg composites exhibit fewer internal voids and cracks, with a uniform distribution of B4 C particles in the aluminium matrix and good bonding between the B4 C particles and the AlSi10Mg matrix. The density of the 3 wt. %B4 C/AlSi10Mg composite material reaches 99.39% with a laser power of 240 W, a scanning speed of 1 400 mm/s, a powder thickness of 0.03 mm and a scanning spacing of 0.13 mm. When the B4 C particle content is increased to 5 wt. %, although the hardness is improved, the density, tensile strength and elongation are reduced.