改性超细SiC粉体对ZA27合金耐磨性能的影响  

Influence of Modified Superfine Si C Powders on Wear Behavior of ZA27 Alloy

作　　者：刘桂林[1] 阎志明[1] 陈美玲[1] LIU Guilin;YAN Zhiming;CHEN Meiling(School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2021年第6期91-95,共5页Journal of Dalian Jiaotong University

基　　金：国家自然科学基金资助项目(51204028)。

摘　　要：对添加不同量(质量分数0~1%)改性超细SiC粉体的ZA27合金进行金相组织和耐磨性能研究.从添加粉体前后的ZA27合金组织对比发现:未添加粉体的ZA27合金组织中树枝晶比较发达,ε相呈网状分布,还有一定的尖角.随添加量增大,其中树枝晶变短,富Al-α相由树枝晶组织向等轴晶组织转变;加入量达到0.1%时,晶体尺寸进一步减小,且已基本转变为柱状组织,树枝晶组织的细化效果最优,ε相变得规整化;同时,随着添加量增加,磨损量降低,磨损率逐渐减小,加入量为0.1%时耐磨性能最佳,提高了30.4%.Aastract:A ZA27 alloy reinforced by different contents of modified superfine SiC powders(0-1 wt%) is investigated. By analyzing the microstructure changes of the ZA27 alloy before and after the powder addition, it is found that the dendrites in metallographic structure of the original ZA27 alloy is relatively developed, and the ε phase is netlike in morphology with a certain sharp angle. As the SiC powder content is increased, the size of the dendritic α(Al) phase structure is decreased and turned into isometric structure. When the SiC powder content is increased to 0.1 wt.%, the grain size is further decreased, the coarse dendrites become cylindrical structure, and the morphology of the ε phase is changed from ellipsoidal to rod-like. The dendritic structure is increased a little on the contrary, and the distribution of the Al-rich α phase is random. The wear test result shows that the weight loss is increased with increasing the test time. The addition of the modified superfine SiC powders reduces the weight loss of the ZA27 alloy, and the wear rate is changed a little. When the content of the modified superfine SiC powders is 0.1 %, the wear resistance of the ZA27 alloy is the best, and it is 30.4% larger than that without any SiC addition.

关 键 词：ZA27合金 改性超细SiC粉体 耐磨性能 

分 类 号：TG146.13[一般工业技术—材料科学与工程]