激光选区熔化AlMgScZr/AlSi10Mg工艺及性能

Research on the selective laser melting (SLM) forming of scandium-containing aluminum alloy/aluminum alloy multi-materials was carried out, and the influence of process parameters on the microstructure and macroscopic properties was analyzed. The HK125 selective laser melting forming equipment was used to optimize the orthogonal window of laser power and scanning rate, and the volumetric energy density with the optimal interface bonding of multi-material samples was obtained as 117.6 J/mm~3. Through optical microscope observation and energy dispersive spectrometer (EDS) elemental analysis, it was found that there was elemental diffusion in the interface transition region, and the average hardness of the interface region was slightly lower than that of the alloys on both sides, which was related to the formation of weak intermediate phase compounds. The flexural strength and modulus of the AlMgScZr/AlSi10Mg multi-material component were 698 MPa and 2.70 GPa respectively, the horizontal bonding tensile strength of the multi-material component could reach 279.6 MPa, and the vertical bonding tensile strength was 206.5 MPa. The results showed that the AlMgScZr/AlSi10Mg multi-material had a good metallurgical bonding effect, and its horizontal bonding performance was better than its vertical bonding performance.

开展了含钪铝合金/铝合金多材料激光选区熔化(Selective Laser Melting,SLM)成形研究,分析工艺参数对微观结构和宏观性能的影响.采用HK125型激光选区熔化成形设备,优化激光功率和扫描速率正交窗口,获得多材料样件界面结合最优的体能量密度为117.6 J/mm~3.通过光镜观察和能谱仪(energy dispersive spectrometer, EDS)元素分析发现界面过渡区域存在元素扩散,界面区域平均硬度略低于两侧合金,其与形成弱中间相化合物有关.AlMgScZr/AlSi10Mg多材料构件的抗弯强度和模量分别为698 MPa和2.70 GPa,多材料构件的水平结合抗拉强度可达279.6 MPa,垂直结合抗拉强度为206.5 MPa.结果表明AlMgScZr/AlSi10Mg多材料具有良好的冶金结合效果,并且其水平方向结合性能优于垂直方向结合性能.