元素替代对正畸用β钛合金(TMA)组织与力学性能的影响  

Effects of Element Substitute on the Structure and Mechanical Properties of Beta Type Ti Alloy(TMA) for Orthodontics

作　　者：潘敏[1] 朱达川[1] 曹仕秀[1] 涂铭旌[1] 

机构地区：[1]四川大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2008年第11期889-891,共3页Special Casting & Nonferrous Alloys

摘　　要：用Cr、Fe或Ce替代β钛合金Ti-11Mo-6Zr-4Sn(TMA)中的部分Mo和Sn,利用X射线衍射仪(XRD)分析了合金的物相结构,用扫描电镜(SEM)观察合金组织形貌、结合电子能谱(EDS)分析了合金元素的分布,利用纳米硬度计测试合金的弹性模量,数字式显微硬度计测试显微硬度,研究了合金元素与均匀化热处理(900℃×2h)对TMA组织和力学性能的影响。结果表明,均匀化热处理前后合金元素Cr、Fe的加入不改变TMA的β相结构;元素Ce、Sn的存在不改变TMA的主相结构,但是在均匀化热处理后添加了Ce、Sn的合金出现了少量的α相和ω相;Cr、Fe替代部分Mo和Sn可提高TMA的杨氏模量和显微硬度,而Ce替代部分Mo则使TMA的杨氏模量和显微硬度降低。The microstructure of beta Ti alloy Ti-11Mo-6Zr-4Sn(TMA) in which some Mo and Sn are substituted by Cr,Fe and Ce was observed by XRD(X-ray diffraction),SEM(scanning electron microscope) and EDS(energy dispersive spectrumeter),and the elastic modulus as well as microhardness was measured by CSEM nano-indentation and micro-sclerometer.Furthermore,effects of alloying elements and homogenization treatment on microstructure and mechanical properties of the TMA were described.The results indicate that β phase structure in TMA is independent of the Ce and Fe addition after and before homogenization treatment.Although the dominant phase in the TMA is not affected,precipitation of a little α phase and ω phase can be observed in the TMA alloy after homogenization treatment with Ce and Sn addition.The Young's modulus and micro-hardness of the TMA alloy are increased with Cr and Fe substituting for Mo and Sn,while they are decreased with Ce substituting for Mo.

关 键 词：Β钛合金 组织形貌 力学性能 元素替代 均匀化热处理 显微硬度计 正畸 物相结构 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG146.21[金属学及工艺—金属材料]