| Title: | Interdiffusivity in titanium-tantalum alloys processed at 1473 K |
| Author: | Dibbern, Jennifer C |
| Other Contributors: | Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. |
| Advisor: | Samuel M. Allen. |
| Department: | Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. |
| Publisher: | Massachusetts Institute of Technology |
| Issue Date: | 2007 |
| Abstract: | Titanium-tantalum (Ti-Ta) alloys are likely to have a high biocompatibility and corrosion resistance that renders them novel materials of interest for biomedical applications[7, 14, 2]. With high strength and a low elastic modulus, Ti-Ta alloys have attracted attention as candidates for such uses as hip replacements[2]. A current challenge impeding use of these alloys is that, with a melting temperature of 3269 K, homogeneous alloys involving Ta are difficult to produce by conventional melting practice[3]. The objective of this work was to, as most structural changes occur via diffusion, gain insight into this matter through determination of the interdiffusivity in Ti-Ta alloys. A scanning electron microscope was utilized to perform energy dispersive x-ray analysis on Ti-Ta alloy samples in the range of 20 to 60 weight percent (wt %) Ta. A computational model that employed Fick's Second Law was used to extract interdiffusivity values from the data. Interdiffusivity values, which ranged from 4.0. 10-13-Tfor 20 wt % Ta to 3.0. 0-14- for 60 wt % Ta, exhibited a systematic variation with composition. The interdiffusion coefficient was seen to decrease with increasing weight fraction Ta. |
| Description: |
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2007. Includes bibliographical references (leaves 33-34). |
| URI: | http://hdl.handle.net/1721.1/44821 |
| Keywords: | Materials Science and Engineering. |
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