RE对ZA-27合金组织和性能的影响

为进一步提高ZA-27合金的耐磨性,研究了RE对其组织和性能的影响。实验结果表明;RE使这种合金的晶粒细化,二次枝晶臂间距缩短,α相面积百分数略有增加。加入RE量大于0.1%时,基体中出现含RE硬质点,其形貌随RE加入量的提高而变化。RE的上述行为使ZA-27合金的强度和硬度略有提高,韧性降低,在润滑条件下的耐磨性可大辐度提高。

Influences of RE on the Properties and Structure of ZA-27 Alloy

In order to investigate the possibility of improving the wear resistance of ZA-27 alloy, the influence of RE on the properties and structure of alloy has been studied. The experimental results show that RE refines grain size, shortens secondary dendrite arm spacings, increases the areal fraction of phase. When the RE addition is larger than 0.1%, hard phase containing RE appears in the metal matrix. The morphology of this phase varies with the increase of RE addition. The above mentioned behavior of RE enhances tensile strength and hardness slightly, decreases toughness and increeases wear resistance of ZA-27 alloy remarkably.