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

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• 作者：Bo Nie (12) nnbbyyxx@163.com
  Zhi-min Yin (1)
  Da-peng Zhu (1)
  Yong-yi Peng (1)
  Feng Jiang (1)
  Ji-wu Huang (1)
• 关键词：Key words Sc ; Zr ; Al ; Mg ; Mn alloy ; homogenization ; Al3(Sc ; Zr) precipitation ; microstructures ; tensile properties ; hardness
• 刊名：Journal of Central South University of Technology
• 出版时间：August 2007
• 出版年：2007
• 期刊代码：pc528_1005-9784
• 类别：et
• 卷：14
• 期：4
• 页码：452-455
• 数据来源：sp

摘要

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 掳C for 6–8 h.