正畸用新型TB12钛合金的组织与力学性能Microstructure and mechanical properties of TB12 alloy developed for dental orthodontics

为了满足正畸用牙弓丝材料高强度、高塑性和高弹性的性能要求，研究了固溶和时效热处理对新型正畸用TB12(Ti-11Mo-5Zr-4Sn-3Nb，质量分数，%)合金组织与力学性能的影响。研究结果表明：固溶温度的升高使得β晶粒尺寸增大，而对力学性能的影响不明显，这使得固溶态合金保持了大于900 MPa的高强度、60~63 GPa的较低弹性模量以及16%~18%的较高伸长率，表现出良好的综合性能。时效析出针状α相提高了合金强度，导致塑性降低以及弹性模量增大。循环加载试验表明固溶态合金具有较好的弹性性能，最大可回复应变达到1.7%。基于良好的综合力学性能，不含毒性元素及致敏元素的TB12钛合金有望成为一种新型牙科正畸用材料。

To satisfy the performance requirement including high strength, good ductility and elasticity, the effect of solution treatment and aging on microstructure and mechanical properties was studied for TB12 (Ti-11Mo-5Zr-4Sn-3Nb, mass fraction, %) alloy newly developed for dental orthodontics. The results show that the increase in solution temperature leads to the growth of β grain, while no obvious influence on mechanical properties. The solution treated alloy exhibits high strength of above 900 MPa, low elastic modulus of 60-63 GPa and good ductility with elongation of 16%-18%, exhibiting excellent property matching. Acicular α phase precipitated during aging promotes strength and elastic modulus while impairs ductility. Cyclic tensile test shows that the solution treated alloy possesses good elastic properties with recoverable strain of 1.7%. Based on the favorable comprehensive mechanical properties, the TB12 alloy without toxicity and allergic elements is a hopeful biomedical material used for dental application.

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