Aluminum-magnesium (Al-Mg) alloys containing scandium (Sc) are high-performance lightweight materials. There is still limited research about the additive manufacturing of the materials with the powder-feeding-based laser metal deposition (LMD). This study aims to develop the processing of AA5024 (an Al-Mg alloy containing Sc) with LMD. On this basis, TiC nano-particles are added to the AA5024 powder, in order to seek an approach to reduce the need for Sc for enhancing or adjust the performance of AA5024. Both the pure AA5024 powder and the modified powder are used to build solid parts. Powder analyses are performed to identify the proper powder prepraration window of the ball milling. Mechanical tests, porosity analysis and microstructural analysis are conducted to evaluate the performance of the solid parts. Within the scope of this work, an average tensile strength of 347 MPa and an average yield strength of 296 MPa have been reached in specimens made of AA5024, after the specimens have been aged at 300 °C for 5 h. TiC additives are not able to strengthen and harden AA5024, but the TiC additions have shown a potent effect on homogenizing the microstructure.

包含scan（Sc）的铝镁（Al-Mg）合金是高性能的轻质材料。关于基于粉末进料的激光金属沉积（LMD）的材料的增材制造的研究仍然有限。这项研究的目的是开发使用LMD处理AA5024（含Sc的Al-Mg合金）的方法。在此基础上，将TiC纳米颗粒添加到AA5024粉末中，以寻求减少对Sc进行增强或调节AA5024性能的需求的方法。纯AA5024粉末和改性粉末均用于制造固体零件。进行粉末分析以识别球磨的正确粉末预磨窗口。进行机械测试，孔隙率分析和微观结构分析以评估固体零件的性能。在这项工作的范围内，在AA5024制成的样品中，在300°C下老化5 h后，其平均抗拉强度达到347 MPa，平均屈服强度达到296 MPa。TiC添加剂不能增强和硬化AA5024，但TiC的添加对均匀化微观结构显示出有效的作用。