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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
作者:
作者单位:

1.山西农业大学 农业工程学院,山西 太谷 030801;2.吕梁学院 矿业工程系,山西 吕梁 033001;3.全州大学 机械与汽车工程系,韩国 全州 55069

基金项目:

the Jincheng science and technology plan projects(No. 201702014)


Microstructure and Property Evolution of Al-Zn-Mg-Cu Alloy with Ho Addition During Homogenization
Author:
Affiliation:

1.College of Engineering, Shanxi Agricultural University, Taigu 030801, China;2.Department of Mining Engineering, Lvliang University, Lvliang 033001, China;3.Department of Mechanical & Automotive Engineering, Jeonju University, Jeonju 55069, Korea

Fund Project:

Startup Project of Doctor Scientific Research of Shanxi Agricultural University (2020BQ80)

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    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。

    Abstract:

    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.

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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,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.]
DOI:10.12442/j. issn.1002-185X.20200440

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  • 收稿日期:2020-06-23
  • 最后修改日期:2020-11-26
  • 录用日期:2020-12-22
  • 在线发布日期: 2021-09-07
  • 出版日期: 2021-08-31