选区激光熔化Al-Mg-Sc-Zr合金成形性及力学性能研究

Formation and Mechanical Properties of Al-Mg-Sc-Zr Alloy Prepared by Selective Laser Melting

摘要:

通过选区激光熔化(SLM)技术制备Al-Mg-Sc-Zr铝合金，系统研究了不同工艺参数对铝合金粉末成形性以及不同时效处理条件对SLM成形样品组织和力学性能的影响。结果表明，在高激光功率和低激光扫描速度下，SLM成形样品的致密度较高。沿样品沉积方向可观察到熔池层层堆叠的显微组织，熔池边界和熔池内部均存在细小纳米颗粒。经不同温度时效处理后，样品的硬度和压缩屈服强度先增加后降低。SLM成形样品经400℃时效处理3 h后屈服强度达到最大值469±4 MPa。

Abstract:

In this study, Al-Mg-Sc-Zr aluminum alloy was prepared by selective laser melting (SLM). The effects of different processing parameters on the formation and different aging conditions on mechanical properties of SLM-formed samples were investigated. The results show that the high density samples can be obtained at a high laser power and a low laser scanning speed. The layer by layer stacking of the molten pool can be observed along the deposition direction of the sample. The nanoparticles are observed at both the inside and boundary of molten pool. After aging treatment at different temperatures, the hardness and compressive yield strength of the sample first increase and then decrease. The maximum yield strength ~469 ± 4 MPa is achieved after aged the sample at 400 ° C for 3 h.