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,2021,50(8):2771~2776.[Wang Xiaoguo,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.]
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
投稿时间:2020-06-23  修订日期:2020-11-26
中文关键词:  加Ho的Al-Zn-Mg-Cu合金  均匀化热处理  硬度和电导率  均匀化动力学分析
基金项目:the Jincheng science and technology plan projects(No. 201702014)
中文摘要:
      通过SEM、OM和DSC,研究添加Ho的Al-Zn-Mg-Cu合金均匀化热处理制度,测试不同均匀化热处理过程中合金的电导率和硬度变化。结果表明,铸态合金中存在4种第二相:T(AlZnMgCu),Al7Cu2Fe,Al8Cu4Ho 及S (Al2CuMg),第二相导致合金元素分布存在严重微观偏析。合金在475 ℃均匀化热处理20 h后,T相完全回溶基体且未观察到S相,仅剩余Al7Cu2Fe和Al8Cu4Ho。硬度和电导率随T相的回溶而变化,T相的回溶使得合金硬度升高,电导率降低。同时,在475 ℃均匀化热处理5~20 h过程中,Al3Ho相析出,这一现象引起硬度和电导率的升高。结合均匀化动力学分析,确定合金适宜的均匀化热处理制度为470~475 ℃/20~25 h。
Microstructure and Property Evolution of Al-Zn-Mg-Cu Alloy with Ho Addition During Homogenization
英文关键词:Al-Zn-Mg-Cu alloy with Ho addition  homogenization treatment  micro-hardness and electrical conductivity  homogenization kinetic analysis
英文摘要:
      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.
作者单位E-mail
王孝国 山西农业大学 农业工程学院山西 太谷 030801 wxg315550@163.com 
马利云 吕梁学院 矿业工程系山西 吕梁 033001
全州大学 机械与汽车工程系韩国 全州 55069 
 
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