7Cu2Fe，Al8Cu4Ho 及S (Al2CuMg)，第二相導(dǎo)致合金元素分布存在嚴(yán)重微觀偏析。合金在475 ℃均勻化熱處理20 h后，T相完全回溶基體且未觀察到S相，僅剩余Al7Cu2Fe和Al8Cu4Ho。硬度和電導(dǎo)率隨T相的回溶而變化，T相的回溶使得合金硬度升高，電導(dǎo)率降低。同時，在475 ℃均勻化熱處理5~20 h過程中，Al3Ho相析出，這一現(xiàn)象引起硬度和電導(dǎo)率的升高。結(jié)合均勻化動力學(xué)分析，確定合金適宜的均勻化熱處理制度為470~475 ℃/20~25 h。"/>

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Ho添加對Al-Zn-Mg-Cu合金均勻化熱處理過程中微觀組織和性能演變的影響
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作者單位:

1.山西農(nóng)業(yè)大學(xué) 農(nóng)業(yè)工程學(xué)院，山西 太谷 030801;2.呂梁學(xué)院 礦業(yè)工程系，山西 呂梁 033001;3.全州大學(xué) 機(jī)械與汽車工程系，韓國 全州 55069

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基金項(xiàng)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:

    通過SEM、OM和DSC，研究添加Ho的Al-Zn-Mg-Cu合金均勻化熱處理制度，測試不同均勻化熱處理過程中合金的電導(dǎo)率和硬度變化。結(jié)果表明，鑄態(tài)合金中存在4種第二相：T(AlZnMgCu)，Al7Cu2Fe，Al8Cu4Ho 及S (Al2CuMg)，第二相導(dǎo)致合金元素分布存在嚴(yán)重微觀偏析。合金在475 ℃均勻化熱處理20 h后，T相完全回溶基體且未觀察到S相，僅剩余Al7Cu2Fe和Al8Cu4Ho。硬度和電導(dǎo)率隨T相的回溶而變化，T相的回溶使得合金硬度升高，電導(dǎo)率降低。同時，在475 ℃均勻化熱處理5~20 h過程中，Al3Ho相析出，這一現(xiàn)象引起硬度和電導(dǎo)率的升高。結(jié)合均勻化動力學(xué)分析，確定合金適宜的均勻化熱處理制度為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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王孝國,馬利云.Ho添加對Al-Zn-Mg-Cu合金均勻化熱處理過程中微觀組織和性能演變的影響[J].稀有金屬材料與工程,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
  • 錄用日期:2020-12-22
  • 在線發(fā)布日期: 2021-09-07
  • 出版日期: 2021-08-31