Sc、Zr复合添加对Al-Mg-Si合金时效析出及力学性能的影响

doi:10.13251/j.issn.0254-6051.2026.02.020

摘要/Abstract

摘要： 采用OM、SEM、TEM、EBSD等方法研究了Al-Mg-Si合金和复合添加Sc、Zr的Al-Mg-Si合金板材在不同时效时间下的显微组织、力学性能。结果表明:Al-Mg-Si合金中的第二相主要是Al₈Fe₂Si和Al₅FeSi,而在Al-Mg-Si-Sc-Zr合金中,Al₈Fe₂Si相转化为了Al₅FeSi相,并且形成了(AlSi)₃Sc相。同时Sc、Zr添加引起的晶格畸变,能够降低原子的扩散系数,延缓β″相向β′相的转变。经过545 ℃×50 min+175 ℃×10 h固溶时效处理后,Al-Mg-Si-Sc-Zr合金具有更小的晶粒尺寸,更高的抗拉强度(387.0 MPa)和屈服强度(334.5 MPa),同时有着较高的断裂总延伸率(21.0%)。Al-Mg-Si-Sc-Zr合金的高强度可以归因于(AlSi)₃Sc和Al₃Sc粒子的细晶强化和位错强化以及β″相的析出强化。

关键词: Al-Mg-Si合金, Sc-Zr复合添加, 时效析出, 显微组织, 力学性能

Abstract: Microstructure and mechanical properties of Al-Mg-Si alloy sheets and Al-Mg-Si alloy sheets with compound addition of Sc and Zr were investigated for different aging time by using OM, SEM, TEM, EBSD and other characterization methods. The results show that the secondary phases in the Al-Mg-Si alloy are mainly Al₈Fe₂Si and Al₅FeSi, while in the Al-Mg-Si-Sc-Zr alloy, Al₈Fe₂Si phases are transformed into Al₅FeSi phases, and (AlSi)₃Sc phases are formed. Meanwhile, the lattice distortion induced by the addition of Sc and Zr can reduce the diffusion coefficient of the atoms and delay the transformation from β″ phase to β′ phase. After the solution and aging treatment of 545 ℃×50 min + 175 ℃×10 h, the Al-Mg-Si-Sc-Zr alloy exhibits a smaller grain size, higher tensile strength (387.0 MPa) and yield strength (334.5 MPa), along with a relatively high total elongation at fracture (21.0%). The high strength of the Al-Mg-Si-Sc-Zr alloy can be attributed to the grain refinement strengthening and dislocation strengthening from (AlSi)₃Sc and Al₃Sc particles, as well as the precipitation strengthening from β″ phase.

Key words: Al-Mg-Si alloy, Sc-Zr compound addition, aging precipitation, microstructure, mechanical properties

中图分类号:

TG146.2

皮智敏, 黄宏锋, 柳明, 汝志强, 邱明, 韩昶, 李恩邦. Sc、Zr复合添加对Al-Mg-Si合金时效析出及力学性能的影响[J]. 金属热处理, 2026, 51(2): 126-135.

Pi Zhimin, Huang Hongfeng, Liu Ming, Ru Zhiqiang, Qiu Ming, Han Chang, Li Enbang. Effect of Sc and Zr compound addition on aging precipitation and mechanical properties of Al-Mg-Si alloy[J]. Heat Treatment of Metals, 2026, 51(2): 126-135.

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