| Title |
Microstructure of the Nb-Si-B Alloys in the Nb+T2 Region |
| Authors |
주수현(Soo Hyun Choo); 김영도(Young Do Kim); 오승탁(Sung Tag Oh); 이성(Seong Lee); 류성수(Sung Soo Ryu); 석명진(Myung Jin Suk) |
| DOI |
https://doi.org/10.3365/KJMM.2015.53.1.43 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
intermetallics; solidification; microstructure; hardness test; T2 phase |
| Abstract |
Intermetallic-based materials are interesting for high temperature structural applications because of their good mechanical properties and enhanced oxidation resistance. In this study microstructural examination of the Nb-Si-B alloys at Nb-rich compositions was performed. The Nb-rich corner of the Nb-Si-B system is very attractive because the constituent phases are Nb (a ductile and tough phase with a high melting temperature) and T2 (a very hard intermetallic compound with favorable oxidation resistance), which make a good combination for high temperature structural materials. At compositions lower than 82 at%Nb the microstructure shows the T2 primary phase and eutectic (T2+Nb), while the Nb primary phase and eutectic were formed at higher compositions. Hardness tests (Rockwell A-scale and micro Vickers) were carried out to estimate the optimal composition for good mechanical properties. (Received January 13, 2014) |