آنالیز اشعه ایکس Ti-Nb-Ta-Zr در آلیاژهای تیتانیوم

In situ X-ray analysis of mechanism of nonlinear

super elastic behavior of Ti–Nb–Ta–Zr system beta-type titanium alloy

for biomedical applications

آنالیز اشعه X در جای مکانیسم‌ رفتار سوپرالاستیک غیر‌خطی سیستم Ti-Nb-Ta-Zr

در آلیاژهای تیتانیوم نوع بتا برای کاربردهای زیست‌پزشکی

ABSTRACT

Ti–XNb–10Ta–5Zr (mass %) alloys based on nominal compositions of Ti–35Nb–10Ta–5Zr, Ti–30Nb–10Ta–5Zr, and Ti–25Nb–10Ta–5Zr were fabricated through powder metallurgy and forging and swaging processes for biomedical applications. The tensile deformation mechanisms of the Ti–25Nb–10Ta–5Zr, Ti–30Nb–10Ta–5Zr, and Ti–35Nb–10Ta–5Zr alloys were investigated in situ by X-ray diffraction analysis under several loading conditions.

Under the loading conditions, the X-ray diffraction peaks of all the specimens shifted to higher angles than those obtained under the unloading conditions. For the Ti–30Nb–10Ta–5Zr alloy, the elastic deformation is considered to progress continuously in a different crystal direction although after the elastic strain reaches elastic limit in the crystal direction where the elastic limit is the smallest, slip deformation occurs in that crystal direction. The elastic modulus of this alloy appears to decrease in terms of strain over the proportional limit. Thus, the elastic deformation behavior of the Ti–30Nb–10Ta–5Zr alloy does not obey Hooke's law.

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