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采用真空熔炼法制备出新型医用Ti-14Mo-2.1Ta-0.9Nb-7Zr合金,经800℃保温2 h的固溶处理后,在450和500℃下分别时效2,4,8,12 h。通过金相显微镜(OM)和压缩力学性能测试的方法,研究了不同时效温度、时效时间两个工艺参数对Ti-14Mo-2.1Ta-0.9Nb-7Zr合金显微组织、抗压强度和弹性模量的影响,利用X射线衍射仪(XRD)及扫描电镜(SEM)对合金物相结构和显微组织进行观察并在能谱仪(EDS)上进行元素成分分析。结果表明:在450和500℃下进行相同时间时效,较高温度下抗压强度较低,弹性模量较高。在相同时效温度下,随时效时间的延长,抗压强度先下降再上升而后又下降,而弹性模量呈先上升再下降又上升的趋势。在800℃×2 h的固溶处理后时效450℃×8 h,抗压强度达到2070 MPa,弹性模量降到37.93 GPa,基本符合临床上硬组织植入物的力学性能要求。
A new type of medical Ti-14Mo-2.1Ta-0.9Nb-7Zr alloy was prepared by vacuum melting method. After heat treatment at 800 ℃ for 2 h, the alloy was aged for 2, 4, 8 and 12 h at 450 and 500 ℃, respectively. The metallographic microstructure, compressive strength and elastic modulus of Ti-14Mo-2.1Ta-0.9Nb-7Zr alloy were studied by metallographic microscope (OM) and compressive mechanical property test. The effects of different aging temperature and aging time on the microstructure, The phase structure and microstructure of the alloy were observed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The elemental composition of the alloy was observed by energy dispersive spectrometer (EDS). The results show that under the same aging time of 450 and 500 ℃, the compressive strength is lower and the modulus of elasticity is higher at higher temperature. With the same aging temperature, with the extension of aging time, the compressive strength decreases first and then decreases again, while the elastic modulus first increases, then decreases and then increases. After aging treatment at 800 ℃ for 2 h, the compressive strength reached 2070 MPa and the elastic modulus decreased to 37.93 GPa at 450 ℃ for 8 h, which basically met the mechanical performance requirements of clinical hard tissue implants.