含Ti的Mo-12Si-8.5B合金在不同烧结温度下的微观组织和力学性能  

Microstructure and Mechanical Properties of Mo-12Si-8.5B Alloy with Ti Sintered at Different Temperatures

作　　者：马素娟[1] 颜建辉 MA Su-juan;YAN Jian-hui(Department of Mechanical and Electronic Engineering,Tangshan Vocational College of Science and Technology,Tangshan 063001,China;School of Material Science and Engineering,Hunan University of Science and Technology,Xiangtan 411201.China)

机构地区：[1]唐山科技职业技术学院机电工程系,河北唐山063001 [2]湖南科技大学材料科学与工程学院,湖南湘潭411201

出　　处：《稀有金属与硬质合金》2019年第6期64-68,共5页Rare Metals and Cemented Carbides

摘　　要：采用放电等离子烧结技术在不同温度下制备Mo-12Si-8.5B和Mo-12Si-8.5B-8Ti合金,比较了两种合金的微观组织和室温力学性能。研究结果表明,Mo-12Si-8.5B由Moss,Mo3Si和Mo5SiB2组成;Mo-12Si-8.5B-8Ti合金由(Mo,Ti)ss,(Mo,Ti)3Si和(Mo,Ti)5SiB2构成,Ti在三个相中均产生了固溶。两种合金的密度、维氏硬度和抗弯强度在1400~1600℃烧结时增加较快,在1600~1700℃烧结时无明显变化。与Mo-12Si-8.5B相比,1700℃下烧结的Mo-12Si-8.5B-8Ti合金的硬度和抗弯强度分别提高了10.2%和15.1%,即Ti的添加提高了Mo-12Si-8.5B合金的室温力学性能,这归因于Mo-12Si-8.5B-8Ti合金微观组织孔洞的减少和Ti在(Mo,Ti)ss,(Mo,Ti)3Si和(Mo,Ti)5SiB2中的固溶强化效应。Mo-12Si-8.5B and Mo-12Si-8.5B-8Ti alloys were prepared by spark plasma sintering at different sintering temperatures,and their microstructure and mechanical properties at room temperature were compared.The results show that Mo-12Si-8.5B alloy consists of Moss,Mo3Si and Mo5SiB2,while Mo-12Si-8.5B-8Ti alloy consists of(Mo,Ti)ss,(Mo,Ti)3Si and(Mo,Ti)5SiB2,and solid solution of Ti occurs in the three phases.The density,Vickers hardness and bending strength of the two alloys increase rapidly at the sintering temperatures of 1400~1600℃,and that have no significant change at the sintering temperatures of 1600~1700℃.Compared with the Mo-12Si-8.5B alloy,the hardness and bending strength of the Mo-12 Si-8.5 B-8 Ti alloy sintered at 1700℃ increase by 10.2% and 15.1%,respectively.Therefore,the addition of Ti can improve the mechanical properties of Mo-12Si-8.5B alloy at room temperature,which is attributed to the decrease of micropores in Mo-12 Si-8.5B-8Ti alloy and the solution strengthening effect of Ti in(Mo,Ti)ss,(Mo,Ti)3Si and(Mo,Ti)5SiB2.

关 键 词：Mo-12Si-8.5B合金 TI 烧结温度 放电等离子烧结 微观组织 力学性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]