粉末冶金技术2024，Vol.42Issue(2)：122-127,6.DOI:10.19591/j.cnki.cn11-1974/tf.2024030002
激光粉末床熔融成形金刚石增强铝基复合材料
Diamond reinforced aluminum matrix composites by laser powder bed fusion
摘要
Abstract
6061 aluminum matrix composites added by 3%diamond particles(mass fraction)were prepared by laser powder bed fusion(LPBF).The microstructure,relative density,and tensile properties of the 3%diamond/6061 aluminum matrix composites were characterized and analyzed by optical microscope,scanning electron microscope,X-ray diffractometer,electronic densitometer,and electronic universal testing machine.Results show that the diamond reacts with the Al matrix,generating the needle-like Al4C3 phase,which deposits in the α-Al matrix.Those formed Al4C3 increases dislocations at the grain boundaries,enhances the materials'strength,and delays the failure to fracture.The addition of diamond facilitates the elimination of thermal cracks,but the porous defects remain in 6061 aluminum alloys.The lower scanning speed extends the contact duration between the laser spot and the processed material,leading to the graphitization of the added diamond and the partial evaporation of the Al matrix.Thus,the internal defects exist,exhibiting the low densification of the composite(relative density 97%).The addition of diamond significantly increases the tensile strength of the LPBF formed diamond/6061 aluminum matrix composites,and the ultimate tensile strength reaches the maximum value of 244.2 MPa,the yield strength is 211.6 MPa,and the elongation is 2.1%,respectively,when the laser power is 350 W and the scanning speed is 800 mm·s-1.关键词
激光粉末床熔融/金刚石颗粒/铝基复合材料/工艺优化/力学性能Key words
laser powder bed fusion/diamond particles/aluminum matrix composites/process optimization/mechanical properties分类
矿业与冶金引用本文复制引用
郜文哲,韩笑,魏海滨,路正朕,张利,李晓峰..激光粉末床熔融成形金刚石增强铝基复合材料[J].粉末冶金技术,2024,42(2):122-127,6.基金项目
国家自然科学基金资助项目(52375393,52071299) （52375393,52071299）
山西省科技创新人才团队资助项目(202304051001029) （202304051001029）
山西省科技成果转化引导专项资助项目(202204021301048) （202204021301048）
山西省重点研发计划资助项目(2210300058MZ,202202150401020) （2210300058MZ,202202150401020）
