稀土对HAl62-3-3-0.7合金组织和性能的影响

通过对合金成分的调整分别配制了添加不同量稀土元素的试验用HAl62-3-3-0．7合金。借助金相与扫描电镜观察和分析了各合金的显微组织结构，运用模拟设备测试了各合金的力学性能。文章阐述了稀土元素对该类高强度耐磨黄铜的组织和性能的影响，试验表明适量加入稀土会显著细化晶粒，过量的稀土会导致在合金显微组织中形成线形富稀土相。随着合金中稀土含量的增加，合金的硬度升高，但当稀土含量超过0．1％时，由于线形富稀土相的形成，反而会使合金的力学性能下降。

Effect of Rare Earth on the Microstructure and Mechanical Properties of HAl62-3-3-0.7 Alloy

HAl62 - 3 - 3 - 0.7 alloys with addition of various amount of rare earth are prepared by adjusting the components of the alloys.The change of mierostrueture is investigated by means of optical microscope and SEM.The mechanical properties are tested by hot deformation experiment. Therefore, the effect of RE addition on the microstructure and mechanical properties of alloy was investigated. The results indicate that a small quantity of RE can refine the grain of HAl62 - 3 - 3 - 0.7 alloy, but linear RE-rich phase appeared in the microstructure of alloys which contain plethoric RE.The hardness of alloy increases with the increase of RE concentration, however, it drops markedly.when the addition of RE is more than 0.1%, because of the formation of linear RE-rich phase.