頁籤選單縮合
題 名 | Effect of Omega Phase on Mechanical Properties of Ti-Mo Alloys for Biomedical Applications |
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作 者 | Ho, Wen-fu; | 書刊名 | Journal of Medical and Biological Engineering |
卷 期 | 28:1 2008.03[民97.03] |
頁 次 | 頁47-51 |
分類號 | 410.01336 |
關鍵詞 | Titanium alloy; Molybdenum; Omega phase; Electron microscopy; Mechanical properties; |
語 文 | 英文(English) |
英文摘要 | The present work is a study of mechanical properties of cast binary Ti-Mo alloys (containing 7.5-20 wt% Mo) and the ω phase transformation of β-phase Ti-Mo alloys. The results indicated that when the molybdenum content increased to 9 wt% and higher, a significant amount of β phase was retained and a meta-stable phase called the athermal ω phase was formed. The appearance of the ω reflections changed from sharp to diffuse with increasing molybdenum content. In addition, in the high molybdenum content alloys, the diffuse reflections moved away from the positions an lines joining bcc reflections. X-ray diffraction (XRD) results indicated clearly that ω phase intensities of Ti-10Mo and Ti-12.5Mo alloys were higher than those of the other β-phase Ti-Mo alloys, so the microhardness values of the Ti-10Mo and Ti-12.5Mo alloys were higher than those of the other β-dominated Ti-Mo alloys, When the molybdenum content increased to 15 wt% higher, we almost could not read the characteristic diffraction peak of the ω phase in the XRD patterns. The Ti-15 Mo allay (β+ ω phase) had a higher modulus than that of Ti-7.5Mo (a"-dominated phase); this may be caused by the formation of the ω phase during quenching. |
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