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熱處理對醫(yī)用Ti-15Nb-5Zr-6Mo合金組織與力學性能的影響
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更新時間：2015-09-09
研究固溶和時效熱處理對近β型醫(yī)用Ti-15Nb-5Zr-6Mo合金的組織與力學性能的影響。
熱處理對醫(yī)用Ti-15Nb-5Zr-6Mo合金組織與力學性能的影響Effect of heat treatment on microstructure and mechanical properties of Ti-15Nb-5Zr-6Mo alloy for biomedical application
研究固溶和時效熱處理對近β型醫(yī)用Ti-15Nb-5Zr-6Mo合金的組織與力學性能的影響。結(jié)果表明：固溶溫度的升高使得β晶粒尺寸增大，但是對性能的影響不大，合金表現(xiàn)出較高的強度及良好的塑性。然而較高的屈強比以及塑性硬化階段的缺失，使其應(yīng)用受到局限。時效處理引入的α相強化使得合金強度提高到1 000 MPa以上，塑性提高到15%~20%；同時，塑性階段出現(xiàn)應(yīng)力平臺，表現(xiàn)為穩(wěn)態(tài)塑性變形。因此，通過合理的熱處理工藝可以在保證合金高強度的同時提高塑性。
The effects of solution treatment and aging on microstructure and mechanical properties of near β Ti-15Nb-5Zr-6Mo alloy developed for biomedical application were investigated. The results show that the increase in solution temperature results in an increased β grain size, while shows no obvious influence on the mechanical properties. The solution-treated alloy exhibits high strength and good ductility. However, the properties matching is limited in actual application due to its high ratio of yield to ultimate strength and the lack of hardening stage during plastic deformation. The precipitation of α phase during aging treatment leads to a great strength of above 1 000 MPa and good ductility with elongation of 15%-20%. Additionally, a stress flat is observed, exhibiting stable plastic deformation. Therefore, the strength and ductility of Ti-15Nb-5Zr-6Mo alloy can be improved simultaneously by a reasonable heat treatment.
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