近年來，由於鈦合金具有著高生物相容性以及高安全性、穩定性，因此在生醫植入物方面獲得顯著之發展，尤其是在骨折案例中手術部位之固定所需的骨釘及金屬縫線﹔但這些材料在人體中有安全性、耐久性與耐腐蝕性之問題，而且其楊氏模數(E)之差異會導致應力遮蔽(stress-shielding)效應，最後可能會導致原本骨頭萎縮。非晶合金相較於結晶合金，具有較低的楊氏係數、高彈性變行回復能力、高硬度等性質，另一方面鈦基非晶合金有著低密度、出色的生物相容性及抗腐蝕力，所以在生醫材料的運用上很有優勢。本研究的目的為設計出一可運用於生醫駐植物之不含有害元素的鈦基非晶質合金。因此選擇TixZryTazSi15 (at.%)合金系列進行成份設計，研究結果顯示，以Ti42Zr40Ta3Si15非晶質合金具有最佳之機械性質及過冷液相區間，在薄帶折曲180?後未發生破裂，且成份中不含任何有毒元素不會對人體造成傷害。 A series of toxic element-free Ti-Zr-Ta-Si amorphous alloy ribbons have been successfully prepared by melt-spinning method. The differential scanning calorimetry (DSC), X-ray diffraction analysis, bending test, and microhardness test are conducted for studying the thermal and mechanical properties of these alloy ribbons. The results show that the highest value (80 K) of supercooled liquid region (SCL, SCL= Tx - Tg , glass transition temperature (Tg) and crystallization temperature (Tx) are 693 and 773 K, respectively) occurs at the composition of Ti42Zr40Ta3Si15. In addition, this amorphous alloy exhibits the best thermal stability during isothermal annealing at the middle temperature of its SCL. Moreover, the Ti42Zr40Ta3Si15 amorphous alloy ribbon presents excellent ductility by bending test, without fracture and no crack after bending over 180 degree. Therefore, the composition of Ti42Zr40Ta3Si15 is believed to be a promising based alloy for fabricating the porous metallic glass in the application of biomedical implant.
