| Title |
Room and Elevated Temperature Tensile Properties of Low Cost , High Strength Ti-Fe-Si Alloys |
| Authors |
정희원(Hi Won Jeong),김승언(Seung Eon Kim),현용택(Yong Taek Hyun),이용태(Yong Tai Lee) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Abstract |
A TFS(Ti-xFe-ySi) alloy system has been newly designed for a high strength titanium alloy with low cost. In this study, Fe was selected as β-stabilizer to replace expensive β-stabilizing elements such as V, Mo. In addition, Si was selected as third element to compensate the high temperature mechanical properties. Fe contents of over 4 wt% stabilize β phase even at room temperature. Coarse silicide chain was formed at prior β grain boundary in TFS alloys containing over 2 wt% of Si, and deteriorated the mechanical properties. Fe was dissolved in Ti matrix as solid solution and increased α/β phase boundaries. Si was also dissolved as solid solution or precipitated finely in Ti matrix. The optimum composition range was Ti-4Fe-(0.5∼1)Si. Ultimate tensile strength was a range of 799∼831 ㎫ at room temperature and 532∼585 ㎫ at 400℃ which are comparable to Ti-6Al-4V. |