Effect of Si Content on the Creep Properties of Ti-6Al-4Fe-xSi Alloys
| Periodical | Key Engineering Materials (Volumes 261 - 263) |
|---|---|
| Main Theme | Advances in Fracture and Failure Prevention |
| Edited by | Kikuo Kishimoto, Masanori Kikuchi, Tetsuo Shoji and Masumi Saka |
| Pages | 1141-1146 |
| DOI | 10.4028/www.scientific.net/KEM.261-263.1141 |
| Citation | Jong Won Yoon et al., 2004, Key Engineering Materials, 261-263, 1141 |
| Online since | April, 2004 |
| Authors | Jong Won Yoon, E.H. Kim, Hi Won Jeong, Yong Taek Hyun, Seung Eon Kim, Yont Tai Lee |
| Keywords | Creep Properties, Precipitation, Si Content, Ti-6Al-4Fe-xSi Alloy |
| Price | US$ 28,- |
Effect of silicon content on the creep properties of Ti-6Al-4Fe-xSi was studied. Creep resistance of Ti-6Al-4Fe-xSi alloys was superior to that of Ti-6Al-4V. Ti-6Al-4Fe-0.5Si alloy exhibited the highest rupture strength and creep resistance among the Ti-6Al-4Fe-xSi alloys investigated. The minimum creep rate of the alloys decreased with increasing silicon content up to 0.5wt.% and then it increased again when the silicon content was higher than 0.5wt.%. TiFe precipitates were formed mainly at the β phase area of Ti-6Al-4Fe-xSi alloys by consuming titanium and iron in β phase, when the alloys were thermally exposed at 500 and 600°C during the creep test. During the creep test, microvoids were induced at the TiFe/α phase interfaces and the cracks were formed along the TiFe/α phase interfaces by the coalescence of the voids. Those cracks were finally connected each other through the α phase.
