纳米处理铝合金2024的电弧增材制造
Wire-Arc Additive Manufacturing of Nano-Treated Aluminum Alloy 2024.
作者信息
Chi Yitian, Murali Narayanan, Zheng Tianqi, Liu Jingke, Li Xiaochun
机构信息
Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, California, USA.
Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California, USA.
出版信息
3D Print Addit Manuf. 2024 Apr 1;11(2):e529-e536. doi: 10.1089/3dp.2022.0150. Epub 2024 Apr 16.
With high strength and good fatigue resistance, Al-Cu alloys such as AA2024 are widely used in the aerospace and automotive industries. However, the system's susceptibility to hot cracking and other solidification defects hinders its development in metal additive manufacturing (AM). A nano-treated AA2024 deposition, with the addition of TiC nanoparticles, is successfully additively manufactured without cracks. Microstructural analysis suggests nanoparticles not only mitigate the hot cracking sensitivity but also significantly refine and homogenize grains, resulting in an average size of 23.2 ± 0.4 μm. Microhardness profiles show consistent mechanical performance along the build direction, regardless of cyclic thermal exposure. Finally, excellent tensile strength and elongation up to 428 MPa and 7.4% were achieved after heat treatment. The combined results show a great promise of nano-treating in high-strength aluminum AM.
诸如AA2024之类的铝铜合金具有高强度和良好的抗疲劳性，在航空航天和汽车工业中得到广泛应用。然而，该体系对热裂纹和其他凝固缺陷的敏感性阻碍了其在金属增材制造（AM）中的发展。通过添加TiC纳米颗粒成功地增材制造出了无裂纹的纳米处理AA2024沉积物。微观结构分析表明，纳米颗粒不仅降低了热裂纹敏感性，还显著细化并均匀化了晶粒，平均晶粒尺寸为23.2±0.4μm。显微硬度曲线表明，无论循环热暴露情况如何，沿构建方向的机械性能都是一致的。最后，热处理后获得了高达428MPa的优异抗拉强度和7.4%的伸长率。综合结果表明，纳米处理在高强度铝增材制造中具有巨大潜力。
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