To further refine the coarse columnar grains (CGs) in selective laser melted (SLMed) alloy, an Al-4.0Mg-0.7Sc-0.4Zr-0.5Mn alloy was fabricated by selective laser melting (SLM) and then subjected to cold rolling and annealing at 300 °C for 1 h. Microstructural details and mechanical properties were examined by SEM, EBSD, TEM, and tensile tests. The results show that the microstructure of the SLMed alloy can be further refined by cold rolling. A yield strength of 573 MPa is obtained with an average grain size of 2.4 ± 1.3 μm in the CGs areas, a reduction of approximately 30% compared with the as-fabricated alloy. The enhanced strength of the rolled alloy is derived from the refined grains and high density of Al₃(Sc, Zr) phase. Additionally, the Al₃(Sc, Zr) particles can enhance the microstructure stability.

为了进一步细化选择性激光熔融（SLMed）合金中的粗柱状晶粒（CGs），通过选择性激光熔融（SLM）制备了Al-4.0Mg-0.7Sc-0.4Zr-0.5Mn合金，然后进行冷轧和在300°C下退火1小时。通过SEM，EBSD，TEM和拉伸试验检查了微观结构细节和力学性能。结果表明，可以通过冷轧进一步细化SLMed合金的显微组织。在CGs区域获得的平均屈服强度为573 MPa，平均晶粒尺寸为2.4±1.3μm，与加工后的合金相比，降低了约30％。轧制合金强度的提高源自细化晶粒和高密度的Al ₃（Sc，Zr）相。此外，Al ₃（Sc，Zr）颗粒可以增强微观结构的稳定性。