钇对Al-Cu-Mg-Mn合金组织与性能的影响

采用金相显微镜、X射线衍射仪及扫描电镜等研究手段,研究了质量分数为0%～0.4%的Y在Al-Cu-Mg-Mn合金中存在形式及对其组织性能的影响,研究结果表明：Y含量在低于0.3%范围时,随含量增加合金细化效果逐渐增加;当Y含量为0.3%时,铸态组织中晶粒细化与组织均匀化效果明显;当Y含量大于0.3%时,合金的铸态组织中晶粒随着其含量的增加又逐渐粗化;Y加入合金中主要形成Cu4Al8Y,合金组织性能得到改善.

Effects of yttrium on the microstructure and properties of Al-Cu-Mg-Mn alloy

This paper studies the existent form of yttrium in Al-Cu-Mg-Mn alloy and the effects of yttrium 0 % ～ 0.4 %,mass fraction on microstructure and properties of Al-Cu-Mg-Mn alloy using optical microscope,scanning electron microscope and X-ray diffraction.The results showed that the cast microstructure of Al-Cu-Mg-Mn alloy was gradually fined when quantity of yttrium was under 0.3 %（mass fraction）.The grain size dropped and homogenization was fined remarkably with addition of 0.3 %yttrium.The cast microstructures of the alloy gradually become coarse when the percentage of the yttrium increased to more than 0.3 %.The Cu 4 Al 8 Y resulting from addition of yttrium to the Al-Cu-Mg-Mn alloy was distributed at the grain boundary,which is beneficial to improve the property of aluminum alloy.