中国激光, 2016, 43 (5): 0503007, 网络出版: 2016-05-04   

激光选区熔化成形高强Al-Cu-Mg合金研究 下载: 687次

Study on High Strength Al-Cu-Mg Alloy Fabricated by Selective Laser Melting
作者单位
1 华中科技大学武汉光电国家实验室, 湖北 武汉 430074
2 中国空间技术研究院总体部, 北京 100094
摘要
利用激光选区熔化(SLM)技术制备了Al-Cu-Mg合金。研究了激光线能量密度对SLM成形试样致密度的影响。在近乎全致密试样的基础上,研究了SLM成形Al-Cu-Mg合金试样的显微组织和力学性能。通过热处理工艺提高了试样的力学性能。研究表明,激光线能量密度为2.4 kJ/m时,成形试样的致密度最高,达到99.8%,近乎全致密。成形试样显微组织由极其细小的过饱和胞晶构成。在细晶强化和固溶强化作用下,成形试样的抗拉强度为401 MPa,屈服强度为252 MPa,延伸率为6.5%;T4热处理后,在析出强化的作用下,抗拉强度提升至532 MPa,屈服强度提升至338 MPa,延伸率提升至13%。
Abstract
Al-Cu-Mg alloys are successfully fabricated by selective laser melting (SLM). The influence of the applied laser linear energy density on the densification behavior of SLM-processed samples is investigated. Microstructure and mechanical properties of the SLM-processed Al-Cu-Mg alloys are studied based on the nearly fully densified samples. Finally, the mechanical properties of the samples are improved by heat treatment. The results show that the nearly fully densified samples with the highest relative density of 99.8% can be obtained when the laser linear energy density is 2.4 kJ/m. The SLM-processed Al-Cu-Mg samples are constituted of ultrafine supersaturated cellular-dendrites. The tensile strength of 401 MPa, the yield strength of 252 MPa and the elongation of 6.5% are achieved for the SLM-processed Al-Cu-Mg samples in virtue of the effect of grain refinement and solid solution strengthening. After T4 heat treatment, under the effect of precipitation strengthening, the tensile strength increases to 532 MPa, the yield strength increases to 338 MPa and the elongation increases to 13%.

张虎, 聂小佳, 朱海红, 曾晓雁, 杨昌昊. 激光选区熔化成形高强Al-Cu-Mg合金研究[J]. 中国激光, 2016, 43(5): 0503007. Zhang Hu, Nie Xiaojia, Zhu Haihong, Zeng Xiaoyan, Yang Changhao. Study on High Strength Al-Cu-Mg Alloy Fabricated by Selective Laser Melting[J]. Chinese Journal of Lasers, 2016, 43(5): 0503007.

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