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设计一种新型生物医用亚稳定β钛合金,合金成分为Ti-25Nb-10Ta-1Zr-0.2Fe(质量分数),采用真空自耗电弧熔炼制备合金锭坯,研究合金的固溶时效行为。通过X射线衍射(XRD)仪,透射电子显微镜(TEM),扫描电子显微镜(SEM)研究合金的相组成及微观组织。测量合金时效后的抗拉强度和不同时效时间的硬度。结果表明:800℃,1h固溶后合金得到马氏体α″相,400℃下时效,短时间即得到ω相和β相。ω相为脆性相,大量ω相的产生使合金的硬度值提高很多,但是强度值相比较冷轧态下降明显,使得材料断裂方式变为脆性断裂。合金在72h时效后ω相仍然保持较多量。
A new type of biomedical metastable beta titanium alloy was designed with the composition of Ti-25Nb-10Ta-1Zr-0.2Fe (mass fraction). The alloy ingot was prepared by vacuum consumable arc melting and the solution aging behavior of the alloy was studied. The phase composition and microstructure of the alloy were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Tensile strength after aging and the hardness of different aging time were measured. The results show that the martensite α "phase is obtained after solution treatment at 800 ℃ for 1h, and the phase of α and β are obtained at 400 ℃ in a short time. The phase of ω is brittle and a large amount of ω phase produces the hardness But the strength value decreased obviously compared with the cold rolling condition, which made the material fracture mode become brittle fracture.The phase of ω-phase remained a relatively large amount after 72h aging.