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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2.4kJ/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532MPa,屈服强度提升至338 MPa,延伸率提升至13%。
Al-Cu-Mg alloy was prepared by laser selective melting (SLM) technique. The effect of laser line energy density on the density of SLM formed samples was studied. The microstructure and mechanical properties of SLM-formed Al-Cu-Mg alloy were investigated on the basis of almost all compact samples. Through the heat treatment process to improve the mechanical properties of the sample. The results show that when the energy density of laser line is 2.4kJ / m, the density of the formed sample is the highest, reaching 99.8%, which is almost all compact. Forming the sample microstructure consists of extremely small supersaturated crystalline cells. The tensile strength of the formed sample is 401 MPa, the yield strength is 252 MPa and the elongation is 6.5% under the fine grain strengthening and solid solution strengthening. After T4 heat treatment, the tensile strength of the formed sample increases to 532MPa, yield strength increased to 338 MPa, the elongation increased to 13%.