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Mg-6Zn-5Al(ZA65)镁合金经580°C保温30min等温热处理后获得非枝晶组织，随后利用光学显微镜（OM）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和显微硬度测试研究了合金在非枝晶态、时效调控下显微组织、析出相和硬化水平的变化规律。结果表明：非枝晶态ZA65合金分别经60°C+48h、80°C+48h、90°C+24h和100°C+24h时效后获得了硬化峰值，其中经90°C+24h时效后达到了75HV峰值，这主要归于析出的GP区或原子团簇扮演了亚稳相或平衡相析出的异质形核核心，使沉淀相分布于晶界，实现沉淀强化和晶界强化。高倍的TEM观察发现，黑色与灰白色的沉淀相呈现共生形态，其中灰白色的沉淀为Mg32(Al,Zn)49相。
Abstract：A non-dendritic microstructure was produced in an Mg-6Zn-5Al(ZA65) magnesium alloy by isothermal heat treatment at 580°C for 30 min. Optical microscopy, scanning electron microscopy, transmission electron microscopy(TEM), and microhardness testing were used to examine microstructural evolution, precipitation, and hardening during subsequent aging. Peak hardening was obtained after aging at 60°C for 48 h, 80°C for 48 h, 90°C for 24 h, and 100°C for 24h. The highest hardness, 75HV, was achieved at 90°C for 24h. This hardening was attributed mainly to Guinier-Preston zones or atomic clusters acting as heterogeneous nucleation sites for metastable or equilibrium precipitates. The resulting grain-boundary precipitates contributed to precipitation strengthening and grain-boundary strengthening. High-magnification TEM revealed coexisting dark and light-gray precipitates, with the light-gray precipitates identified as the Mg32(Al,Zn)49 phase.
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基本信息:
DOI：10.13874/j.cnki.62-1171/g4.2026.05.006
中图分类号:TG146.22;TG156.92
引用信息:
[1]张玉,孙晓飞,常丽,等.时效调控对Mg-6Zn-5Al非枝晶镁合金组织和硬化水平的影响[J].河西学院学报,2026,42(05):36-42.DOI:10.13874/j.cnki.62-1171/g4.2026.05.006.
基金信息:
甘肃省教育厅高校教师创新基金项目“时效调控下Mg-6Zn-5Al非枝晶态镁合金中G.P.区强化机理研究”（2023B-161）; 河西学院第十四批大学生科技创新项目“低温时效处理对Mg-6Zn-5Al非枝晶镁合金组织和硬化水平的影响”（158）;河西学院博士科研启动基金项目“热处理工艺对新型Mg-Zn-X镁合金组织和性能的影响研究”（KYQD2020017）
2026-10-25
2026-10-25