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

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

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    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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[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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History
  • Received:June 23,2020
  • Revised:November 26,2020
  • Adopted:December 22,2020
  • Online: September 07,2021
  • Published: August 31,2021