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Effect of homogenization treatment on microstructure and properties of Al-Mg-Mn-Sc-Zr alloy

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Abstract

The effect of homogenization on the hardness, tensile properties, electrical conductivity and microstructure of as-cast Al-6Mg-0.4Mn-0.25Sc-0.12Zr alloy was studied. The results show that during homogenization as-cast studied alloy has obviously hardening effect that is similar to aging hardening behavior in traditional Al alloys. The precipitates are mainly Al3(Sc,Zr) and Al6Mn. When homogenization temperature increases the hardness peak value is declined and the time corresponding to hardness peak value is shortened. The electrical conductivity of the alloy monotonously increases with increasing homogenization temperature and time. The decomposition of the supersaturated solid solution containing Sc and Zr which is formed during direct chilling casting and the precipitation of Al3(Sc, Zr) cause hardness increasing. The depletion of the matrix solid solubility decreases the ability of electron scattering in the alloy, resulting in the electrical conductivity increased. Tensile property result at hot rolling state shows that the optimal homogenization treatment processing is holding at 300–350 °C for 6–8 h.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Nie Bo  (聂 波) (Senior Engineer), Yin Zhi-min  (尹志民), Zhu Da-peng  (朱大鹏), Peng Yong-yi  (彭勇宜), Jiang Feng  (姜 锋) & Huang Ji-wu  (黄继武)

  2. Northeast Light Alloy Co. Ltd., Harbin, 150060, China

    Nie Bo  (聂 波) (Senior Engineer)

Authors
  1. Nie Bo  (聂 波)
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  2. Yin Zhi-min  (尹志民)
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  3. Zhu Da-peng  (朱大鹏)
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  4. Peng Yong-yi  (彭勇宜)
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  5. Jiang Feng  (姜 锋)
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  6. Huang Ji-wu  (黄继武)
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Correspondence to Nie Bo  (聂 波).

Additional information

Foundation item: Project(2005CB623705-01) supported by the National Key Fundamental Research and Development Program of China; Project(MKPT-2004-16ZD) supported by the National 10th Five-Year Plan Program

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Nie, B., Yin, Zm., Zhu, Dp. et al. Effect of homogenization treatment on microstructure and properties of Al-Mg-Mn-Sc-Zr alloy. J Cent. South Univ. Technol. 14, 452–455 (2007). https://doi.org/10.1007/s11771-007-0088-y

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  • DOI: https://doi.org/10.1007/s11771-007-0088-y

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