合金元素添加對鑄造Ti-15Mo合金之性質影響

Effects of the Addition of Alloys on the Properties of the Cast Ti-15Mo Alloy

10.7117/JSET.200612.0001

何文福(Wen-Fu Ho)；朱建平(Chien-Ping Ju)；陳瑾惠(Jiin-Huey Chern Lin)

Ti-15Mo合金 ； 微結構 ； 機械性質 ； 彈性模數 ； Ti-15Mo alloy ； microstructure ； mechanical property ； elastic modulus

科學與工程技術期刊

2卷4期（2006 / 12 / 01）

1 - 6

繁體中文

鈦及鈦合金因質輕及優良之機械性質，特別是較低的彈性模數且其生物相容性及抗腐蝕性均比傳統金屬佳，因此被廣泛使用在牙科及骨科植入材。雖然Ti-6Al-4V合金廣被作為植入用途，但其中Al可能對人體有不良的影響而V具有毒性。此外，近年來在無骨水泥批覆之髖關節與膝關節置換術中被關切的應力遮蔽效應(stress-shielding effect)，因其容易造成之術後的骨吸收及手術失敗。在研究者最近的研究中開發出一具β相的Ti-15Mo合金期能應用在生醫植入用途，尤其是此合金展現出低的彈性模數性質，遠低於316L不銹鋼、Co-Cr-Mo合金及Ti-6Al-4V合金。本研究將針對Ti-15Mo合金分別添加1wt%的合金元素（Nb，Zr，Cr及Fe），探討微量合金元素之添加對Ti-15Mo合金之相／晶體構造、微結構及機械性質的影響。本研究期望藉由微量合金元素之添加能進一步提高其機械強度，並能保有低的彈性模數。

Titanium and titanium alloys have become two of the most attractive implant materials due to their light weight, high biocorrosion resistance, biocompatibility and mechanical properties, including a low modulus. Although Ti-6Al-4V is popularly used as an implant material, its suspected effects on Al and the cytotoxicity of vanadium have recently been discussed. Concern has also been raised about the stress-shielding phenomenon observed especially in cementless hip and knee prostheses, which can potentially lead to bone resorption and eventual failure of the arthroplasty. In our recent study, a β phase Ti-15Mo alloy was developed for biomedical applications. This alloy exhibits a lower modulus than those of 316L, Co-Cr-Mo and Ti-6Al-4V alloys used as medical implants; however, the strength of the Ti-15Mo alloy is lower than that of Ti-6Al-4V. The present work is a study of the effects of the addition of 1 wt% of a series of alloying elements (Nb, Zr, Cr and Fe) on the structure and properties of a Ti-15Mo system. One major purpose of this research is to improve the strength, yet maintain the low modulus, of the Ti-15Mo alloy by the addition of a small amount of a variety of alloying elements.