Mn和Zr对TMA合金组织与性能的影响

采用金相显微镜、X射线衍射仪(XRD)、数字式显微硬度计、磨损试验机、扫描电镜(SEM),研究了Mn、Zr元素对β钛合金TMA(Ti-11.5Mo-6Zr-4.5Sn)组织、力学性能和耐磨性能的影响。结果表明,Mn替代部分Mo元素没有改变合金的β相结构,但合金在淬火后出现了少量的α″相;Zr含量增加使合金铸态相结构中产生ω相,但在淬火后为β相;Mn元素的加入和Zr含量的增加提高了合金的硬度,降低了合金杨氏模量;合金磨损机理是磨粒磨损和粘着磨损共同作用,Mn替代部分Mo和Zr含量的增加提高了合金的磨粒磨损性能,降低了合金的粘着磨损性能。

Effects of Mn and Zr on Microstructure and Properties of TMA Alloys

Effects of the Mn and Zr elements on microstructure, mechanical properties and wearing resistance of Ti based TMA alloy (Ti-11.3Mo-6Zr-4.3Sn) for orthodontics were investigated by optical microscope (OM), XRD(X-ray diffraction), digital micro-hardness tester, abrasive testing machine, SEM (scanning electron microscope). The results reveal that substitution of element Mn for Mo can not change phase constituent in TMA alloy, however, a little of α' phase can be observed after quenching treatment. ω phase can be created in as-cast microstructure of the TMA alloy with increasing in Zr content, which is transformed into β phase after quenching. Hardness of the TMA alloy is increased and elastic modulus is decreased, and wearing mechanism of the TMA alloy is characterized by abrasive wear and coherent wear, and abrasive wear behavior is improved and coherent wear is deteriorated with substitution of Mn for Mo and the increase of Zr content.