近β型钛合金Ti4Zr1Sn3Mo25Nb(TLM)热处理与材料强化研究  

Microstructure and Wear Resistance of a Novel Ti4Zr1Sn3Mo25Nb (TLM) Alloy

作　　者：于振涛[1] 张亚锋[1] 袁思波[1] 皇甫强[1] 韩建业[1] 刘春潮[1] 

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2008年第A04期542-545,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(30770586);国家重点基础研究发展计划(2005CB623904)

摘　　要：利用光学显微镜、X射线衍射仪、透射电镜和力学试验机、摩擦试验机研究了不同热处理条件对新型近β型钛合金Ti4Zr1Sn3Mo25Nb(TLM)的显微组织、相变以及力学性能和耐磨性的影响。结果表明:TLM合金在β相区固溶处理后主要形成亚稳的等轴β相(βms),在低温时效时βms开始分解,在晶粒内部形成大量密集次生α相(αs),并呈现点状和细针状分布,从而使合金产生弥散强化和细晶强化。680℃,1h空冷+510℃,6h空冷TLM钛合金的耐磨性最好,其耐磨性优于退火态Ti6Al4V和时效态Ti-13Nb-13Zr钛合金。The effects of heat treatment on the microstructure, phase constitution, mechanical properties and wear resistance of near β Ti4Zr1Sn3Mo25Nb （TLM） alloy were investigated by optical microscope, X-ray diffraction and Transmission electron microscopy and MTS tester, fraction tester etc. The results show that the specimen is mainly composed of meta-stable isoaxial βms phase with lower strength after β phase region solution treated. The βms start to dissolve during aging at low temperature and then large quantities of finer secondary α phase （αs） with dot or needle shape are formed in β matrix, and thus the aging treatment leads to dispersion strengthening and fine grain strengthening of TLM alloy. The friction coefficient of TLM alloy under 680 ℃, 1 h, AC and 510 ℃, 6 h, AC is smaller than that of Ti-6Al-4V and aged Ti-13Nb-13Zr, which possess a better wear resistance and higher hardness.

关 键 词：热处理 材料强化 耐磨性 显微组织 Β型钛合金 Ti4Zr1Sn3Mo25Nb 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]