稀土铝锰对高锌镁合金组织和性能的影响

The effect of Re Al and Mn Element on Microstructure and Property of High Zinc Magnesium Alloy

研究了含Zn15%、Al5%、Re1.5%的高锌镁合金中加入不同含量的Mn元素后,其显微组织与力学性能的变化情况。结果显示:加入Mn粉后,含Re的高锌镁合金中的针状组织得到不同程度的球化。随着Mn粉加入量的增加,硬度逐渐增大,冲击韧性、强度先增后减,出现峰值。当Mn含量为0.4%时,冲击韧性达到最大值5.06J/cm2,强度也达到最大值227.2MPa。此时,其组织晶粒最细最均匀,针状组织也得到最大程度的改善,由原来的细长针状组织变成短粗棒状;当Mn以中间合金的形式加入到高锌镁合金中时,Re含量依次取为1.5%、1.0%、0.75%、0.5%,冲击韧性在Re含量为1.0%时达到最大值3.4J/cm2,强度在Re含量为1.5%时达到最大值222.22MPa。但是,加中间合金的镁合金的力学性能普遍比加Mn粉的要差。

This paper studied the microstructure and mechanical of high zinc Magnesium alloy added various Mn content. The results showed the acicular constituent in the magnesium alloy was spheriodized to different levels after adding Mn powder. With the increase of Mn quantity, hardness increases, impact toughness and strength increases and then decreases. When added 0.4wt% Mn, the toughness and the strength reach peak value of 5.06J/cm^2 and 227.2Mpa respectively, the grains are finest and homogeneousest, acicular constituent are improved the most from lank to podgy. When Mn is added in the form of master alloy, the toughness reaches the peak value 3.4J/cm^2 at 1.0wt% content Re, the strength reaches the peak value 222.22Mpa at 1.5wt% content Re. The mechanical properties of the high zinc magnesium added Mn master alloy are worse than added Mn powder.