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王孝国,马利云.Ho添加对Al-Zn-Mg-Cu合金均匀化热处理过程中微观组织和性能演变的影响[J].稀有金属材料与工程(英文),2021,50(8):2771~2776.[Wang Xiaoguo and Ma Liyun.Microstructure and Property Evolution of Al-Zn-Mg-Cu Alloy with Ho Addition During Homogenization[J].Rare Metal Materials and Engineering,2021,50(8):2771~2776.]
Microstructure and Property Evolution of Al-Zn-Mg-Cu Alloy with Ho Addition During Homogenization
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Received:June 23, 2020  
Key words: Al-Zn-Mg-Cu alloy with Ho addition  homogenization treatment  micro-hardness and electrical conductivity  homogenization kinetic analysis
Foundation item:the Jincheng science and technology plan projects(No. 201702014)
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Wang Xiaoguo and Ma Liyun  
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      Homogenization treatment for Al-Zn-Mg-Cu alloy with Ho addition was investigated by scanning electron microscope (SEM), optical microscope (OM), and differential scanning calorimeter (DSC). Electrical conductivity and micro-hardness were tested during different homogenization processes. The results show that there are four kinds of second phases in as-cast alloy: T(AlZnMgCu), Al7Cu2Fe, Al8Cu4Ho and S (Al2CuMg), which cause severe micro-segregation in microstructure. After homogenization treatment at 475 °C for 20 h, T phase is completely dissolved back into matrix and no S phase is observed, with Al7Cu2Fe and Al8Cu4Ho remaining. Micro-hardness and electrical conductivity are associated with vibration of T phase, dissolution of which can increase micro-hardness and decrease electrical conductivity. Besides, precipitation of Al3Ho also contributes to the increase in both micro-hardness and electrical conductivity during homogenization at 475 °C for 5~20 h. Finally, through homogenization kinetic analysis, the appropriate homogenization parameter is determined as 470~475 °C/20~25 h.