【摘要】 采用选择激光熔化(SLM)技术在不同工艺参数下制备Al-4.77Mn-1.37Mg-0.67Sc-0.25Zr合金(质量分数，%)，通过拉伸试验和显微观察研究合金的组织和力学性能。结果表明：当能量密度为104～143 J/mm~3时，力学性能保持相对稳定；屈服强度为335～338 MPa，抗拉强度为397～400 MPa，伸长率均在11%以上。在此能量密度区间内，SLM合金缺陷和粗大金属间化合物较少，与此同时，有大量细小的Al Fe Mn Sc Zr相析出。当能量密度超过152 J/mm~3时，可以观察到一些孔洞和裂纹，且伸长率急剧下降。定量计算结果表明，该合金固溶强化、晶界强化和析出强化占比分别为44%、41%和15%。更多还原

【Abstract】 A new Al-4.77Mn-1.37Mg-0.67Sc-0.25Zr alloy(wt.%) was prepared by selective laser melting(SLM) technique under different processing parameters, and the microstructure and mechanical property of the SLM alloys were investigated by tensile tests and microscopy methods. The results show that when the energy density ranges from 104 to 143 J/mm~3, the mechanical properties remain relatively stable. The yield strength, ultimate tensile strength and elongation are 335-338 MPa, 397-400 MPa and above 11%, respectively. Meanwhile, few defects and coarse intermetallics form and lots of fine Al Fe Mn Sc Zr phases precipitate. When the energy density exceeds 152 J/mm~3, some cavities and cracks can be observed, and elongation decreases sharply. The quantitative calculation results show that the solid solution strengthening, grain boundary strengthening and precipitation strengthening account for 44%, 41% and 15%, respectively.更多还原