About thermostability of biocompatible Ti–Zr–Ag–Pd–Sn amorphous alloys
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A new Ti-based amorphous alloy without any harmful additions of elements and supplementary Ag content was developed for applications in orthopedics and dentistry. Since complete elimination of toxic elements is reducing the glass-forming ability and direct casting of massive components is no longer possible, the new alloy was produced by melt spinning as thin ribbons, which could be subsequently processed by powder metallurgy. Investigations of X-ray diffraction and high-resolution transmission electron microscopy evidenced the fully amorphous structure of the new alloy. Differential scanning calorimetry was used to determine the crystallization point and the heating behavior at rates between 5 and 30 K min−1 in order to estimate by Kissinger’s method the activation energy for crystallization. Investigations evidence that the new Ti30Zr32Ag7Pd24Sn7 crystallizes at around 500 °C and the value of activation energy is relatively low in comparison with similar Ti-based alloys that were successfully processed by powder metallurgy; therefore, thermomechanical processing should be performed exclusively below 500 °C during short fabrication cycles, in order to preserve the amorphous structure.
KeywordsTi-based amorphous alloys Biocompatible materials Melt spinning Kissinger’s method Thermostability
This work was supported by the German Academic Exchange Service (Deutscher Akademischer Austausch Dienst—DAAD).
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