微量Sr对ZA35-4Si-3Sn合金组织与性能的影响

发布时间：2018-04-19 10:58

本文选题：耐磨锌合金 + Sr变质　；参考：《中国有色金属学报》2016年11期

【摘要】：利用普通铸造法制备不同Sr含量的ZA35-4Si-3Sn合金,研究Sr含量对该合金凝固组织和拉伸力学性能的影响,并揭示影响机制,探讨Sr变质合金的摩擦磨损特性。结果表明:Sr含量为0.1%(质量分数)时,初生硅趋向于球状,细小的颗粒状或纤维状共晶硅数量显著增加;此时,合金的硬度达到143HBW,抗拉强度与拉伸应变分别提高45.8%和151.5%。Sr变质主要为促进共晶硅相形核和抑制共晶硅相的生长两种机制共同作用的结果。与ZA27合金相比,ZA35-4Si-3Sn-0.1Sr合金具有更低的摩擦因数。在低速磨损条件下,两种合金的耐磨性相当;而在高速下,后者具有更低的摩擦温升和磨损量,表现出优异的摩擦磨损特性。
[Abstract]:ZA35-4Si-3Sn alloy with different Sr content was prepared by ordinary casting method. The effect of Sr content on solidification microstructure and tensile mechanical properties of the alloy was studied. The influence mechanism was revealed and the friction and wear characteristics of Sr modified alloy were discussed.The results show that the primary silicon tends to be spherical, and the number of fine granular or fibrous eutectic silicon increases significantly when the content of 1: Sr is 0.1 (mass fraction).The hardness of the alloy reaches 143HBW, the tensile strength and tensile strain are increased by 45.8%, respectively, and the modification of 151.5%.Sr is mainly the result of promoting the nucleation of eutectic silicon phase and inhibiting the growth of eutectic silicon phase.The friction coefficient of ZA35-4Si-3Sn-0.1Sr alloy is lower than that of ZA27 alloy.At low speed, the wear resistance of the two alloys is similar, while at high speed, the latter has lower friction temperature rise and wear volume, showing excellent friction and wear characteristics.
【作者单位】：华南理工大学材料科学与工程学院;
【分类号】：TG146.13;TG291

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