选区激光熔化成形Cu-Ag-Zr合金致密化行为及其组织性能研究OA

With rapid industrial development,selective laser melting(SLM)has emerged as a critical manufacturing technique for forming complex components made of high-strength,high-thermal-conductivity copper alloys in the aerospace,aviation,and defense sectors.To address the processing challenge of achieving high-density SLM for highly thermally conductive/highly light-reflective Cu-Ag-Zr alloys,orthogonal experiments were employed to optimize the process parameters and combine remelting techniques to realize high-density alloy formation.The effects of the laser power,scanning speed,and hatch spacing on the densification behavior,microstructure,hardness,and thermal conductivity of the SLM-processed Cu-Ag-Zr powder were systematically investigated.Under a specific powder size range(20～53 μm),with remelting applied,and within a laser power range of 420～500 W and a volumetric energy density of approximately 300 J/mm3,sufficient laser energy input significantly improves the distribution of melt pools and effectively reduces the lack of fusion pores.Moreover,the characteristic rapid solidification of SLM promotes a uniform distribution of alloying elements,resulting in a relatively dense bulk alloy with a relative density of 99.87％.A pronounced<001>//BD texture is observed on the printed surface.The optimized Cu-Ag-Zr alloy has a microhardness of 122.6 HV0.5 and a thermal conductivity of 252 W/(m·K).