Advanced Materials

Biography

Biography: Munkhbayar Baatarsukh Gyeonsang

Abstract

Shape memory alloys are commonly used for various applications, e.g. aerospace, automotive, robotics and biomedical. Presence of low Young’s modulus and biocompatibility factors are two important criteria in biomedical applications. Although Ti-Ni SMAs are commercialized, however, due to the possibility of hypersensitivity of Ni, the β type Ti-based SMAs have been developed and investigated as a potential replacement of Ti-Ni alloys in biomedical applications. The β type titanium alloys attracted to attention for biomedical because of their low stiffness, good corrosion resistance, biocompatible, and superelasticity. The binary Ti-(12.2-35.9)Nb at.% and ternary Ti-Nb-(3.6-12.7)Zr at.% thin-film alloys were prepared by magnetron sputtering method. The structures of the thin films were analyzed by EDS and SEM. Phase constitutions were confirmed by XRD. Mechanical properties of the Ti-Nb-Zr thin film specimens were investigated by nanoindentation test. In bulk, in order to control porous structure, there is used to space holder (NH4HCO3) in sintering method. However, in the present porous structures were observed in some ternary thin film alloys. We expected to porous structure dependent on Zr composition. The Young’s modulus of ternary thin films (80-95Gpa) lower than binary alloys (108-123GPa). The Young’s modulus decreases with the addition of Zr elements for the ternary alloys. The d-electron alloy theory is an effective method of designing titanium alloys with Young’s modulus proposed by Morinaga. The results for Young’s modulus confirms that the d-electrons alloy theory holds for these ternary alloys. Furthermore, we discussed the comparing results of the binary Ti-Nb and Ti-Nb-Zr ternary thin films.