根据β稳定化系数kβ和d-电子理论设计了低弹性模量、中高强度、良好塑性和生物相容性的新型牙科种植用近β型Ti30Nb5Ta6Zr合金,研究了合金在β相区固溶和时效处理后组织和力学性能的变化规律.结果表明,在β相区固溶水淬后组织为亚稳β相.低温时效时析出ω相,随着时效温度的升高,逐渐析出α相.合金的强度和弹性模量随时效温度的升高先升高后下降;延伸率先降低后升高.合金在800 ℃固溶+500 ℃时效后综合力学性能优良,可以满足牙科植入要求.
A new β-type alloy Ti30Nb5Ta6Zr for dental implant with low Young's modulus, medium-high tensile strength, good plasticity and biocompatibility was designed according to β coefficient of stabilization kβ and d-electron theory. The change of microstructures and mechanical properties for the alloy after solution treatment followed by aging in β phase region was investigated. It is found that the alloy is composed of metastable β phase after solution treatment in β phase region; ω phase precipitates when aged at low temperature, while α phase precipitates gradually when the aging temperature increases. With the aging temperature increasing, the strength and Young's modulus of the alloy increase first and then decrease, while the elongation of the alloy decreases first and then increases. The alloy after 800 ℃, 30 min solution treatment and 500 ℃, 12 h aging possesses excellent integrated mechanical properties and can meet the requirement for dental implant.
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