正畸用新型TB12鈦合金的組織與力學(xué)性能Microstructure and mechanical properties of TB12 alloy developed for dental orthodontics

為了滿足正畸用牙弓絲材料高強(qiáng)度、高塑性和高彈性的性能要求，研究了固溶和時(shí)效熱處理對(duì)新型正畸用TB12(Ti-11Mo-5Zr-4Sn-3Nb，質(zhì)量分?jǐn)?shù)，%)合金組織與力學(xué)性能的影響。研究結(jié)果表明：固溶溫度的升高使得β晶粒尺寸增大，而對(duì)力學(xué)性能的影響不明顯，這使得固溶態(tài)合金保持了大于900 MPa的高強(qiáng)度、60~63 GPa的較低彈性模量以及16%~18%的較高伸長(zhǎng)率，表現(xiàn)出良好的綜合性能。時(shí)效析出針狀α相提高了合金強(qiáng)度，導(dǎo)致塑性降低以及彈性模量增大。循環(huán)加載試驗(yàn)表明固溶態(tài)合金具有較好的彈性性能，最大可回復(fù)應(yīng)變達(dá)到1.7%。基于良好的綜合力學(xué)性能，不含毒性元素及致敏元素的TB12鈦合金有望成為一種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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