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Effect of homogenization treatment on microstructure and properties of Al-Mg-Mn-Sc-Zr alloy 被引量:8

Effect of homogenization treatment on microstructure and properties of Al-Mg-Mn-Sc-Zr alloy
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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 ℃ for 6-8 h. 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℃ for 6-8 h.
出处 《Journal of Central South University of Technology》 2007年第4期452-455,共4页 中南工业大学学报(英文版)
基金 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
关键词 SC ZR Al-Mg-Mn alloy HOMOGENIZATION Al3(Sc Zr) precipitation MICROSTRUCTURES tensile properties HARDNESS 均质化 Al-Mg-Mn-Sc-Zr合金 沉淀作用
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