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采用金相显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)观察和硬度、导电率、力学性能检测等方法,研究了微量Sc、Zr及形变热处理对Al-Mg-Si合金组织与性能的影响。结果表明:添加质量分数分别为0.22%Sc和0.05%Zr的Al-Mg-Si合金铸态组织得到显著细化,枝晶组织基本得到消除;在350℃时效过程中,有大量的次生Al3(Sc,Zr)沉淀相析出,强烈地阻碍了位错运动和亚晶界迁移,显著强化了合金;在150℃时效过程中,有Mg2Si强化相析出,进一步强化合金;经600℃固溶+350℃时效+90%轧制变形+150℃时效的形变热处理工艺后,新型Al-Mg-Si-Sc-Zr合金的抗拉强度、硬度和导电率分别达到312 MPa、99 HV0.5和55.4%IACS,综合性能良好。
The effects of Sc, Zr and deformation heat treatment on the microstructures and mechanical properties of Al-Mg-Si alloy were investigated by OM, SEM, TEM and hardness, electrical conductivity and mechanical properties testing. The impact of performance. The results show that the as-cast microstructure of Al-Mg-Si alloy with addition of 0.22% Sc and 0.05% Zr is significantly refined and the dendritic structure is basically eliminated. At 350 ℃ aging time, a large amount of secondary Al3 (Sc, Zr) precipitates precipitated, strongly hindered the movement of dislocations and subgrain boundaries, significantly strengthened the alloy; at 150 ℃ aging process, Mg2Si enhanced precipitation phase, further strengthening the alloy; 600 ℃ solid solution + The tensile strength, hardness and electrical conductivity of the new Al-Mg-Si-Sc-Zr alloy reached 312 MPa, 99 HV0.5 and 55.4, respectively, after the aging treatment at 350 ℃ for aging + 90% rolling deformation + 150 ℃ aging treatment. % IACS, good overall performance.