摘要
利用激光熔炼技术制备出以金属硅化物Ti5Si3为耐磨增强相、以金属间化合物TiCo为增韧相的双相金属间化合物新型耐磨合金。用OM,SEM,XRD与EDS等方法分析了合金的显微组织、相组成及成分。在室温干滑动磨损条件下测试了合金的耐磨性能,研究了合金组织中TiCo含量对合金显微组织、硬度及耐磨性能的影响。结果表明,合金的显微组织均由块状Ti5Si3初生相及TiCo/Ti5Si3共晶基体组成并具有优异的室温干滑动耐磨损性能。随TiCo含量的增加,初生相Ti5Si3的体积分数与合金的显微硬度下降,合金的韧性与耐磨性能随之显著提高。Ti5Si3的高硬度和TiCo的高韧性是该合金具有优异耐磨性能的主要原因。
Dual-phase intermetallic wear resistant alloy with Ti5Si3 as the reinforcing phase and intermetallic TiCo as the toughening matrix was fabricated by the laser melting deposition process. The microstructure and composition of the TiCo/Ti5Si3 intermetallic alloy was characterized by OM, SEM, XRD and EDS. Metallic dry sliding wear property of the alloy was evaluated at room-temperature. The effect of toughening phase TiCo content on the microstructure, hardness and wear resistance of the TiCo/Ti5Si3 intermetallic alloy was investigated. The results indicate that the TiCo/Ti5Si3 intermetallic alloy has fine microstructure consisting of Ti5Si3 primary block-like phase uniformly distributed in the TiCo/Ti5Si3 eutectic structure. The alloy has excellent wear resistance under dry sliding wear test conditions. The volume fraction of the Ti5Si3 primary phase and the hardness of the TiCo/Ti5Si3 intermetallic alloy decrease with increasing of TiCo content, while the toughness and wear resistance of the alloy increase. The excellent wear resistance of the TiCo/Ti5Si3 intermetallic alloy was attributed to the high hardness of Ti5Si3 phase and the good toughness of TiCo phase.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第12期2194-2198,共5页
Rare Metal Materials and Engineering
基金
国家杰出青年科学基金资助项目(50625413)
