Nd元素对反重力浇注ZL116合金组织和力学性能的影响

Effect of Nd Addition on Microstructure and Mechanical Properties of ZL116 Alloy by Counter-Gravity Casting

通过OM、XRD、SEM以及室温拉伸试验等方法,开展了Nd元素对反重力浇注ZL116合金显微组织和力学性能的影响研究。结果表明:当Nd元素含量小于0.1%时,随着Nd元素含量的提高,ZL116合金的抗拉强度和伸长率均有所提高。Nd元素主要分布在共晶Si相周围,阻碍共晶Si相的长大,进而可以促进ZL116合金中的长条状共晶Si转化为颗粒状,即:Nd元素对ZL116合金中共晶相具有变质作用,可以促进共晶Si的球化。

The effect of Nd addition on the microstructure and mechanical properties of ZL116 alloy by counter-gravity casting was investigated by means of OM, XRD, SEM and tensile testing. The results showed an increase in tensile strength and elongation when the Nd content was less than 0.1%. Nd element distributed around the eutectic Si resulted in the growing eutectic Si phase hindered and the stripe eutectic Si transformed into granular shape. So it can be concluded that Nd addition can modify the eutectic Si and promote the spheroidizing of eutectic Si phase in the ZL116 alloy.