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Phase Equilibria, Microstructure, and High-Temperature Strength of TiC-Added Mo-Si-B Alloys
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Phase Equilibria, Microstructure, and High-Temperature Strength of TiC-Added Mo-Si-B Alloys
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Phase Equilibria, Microstructure, and High-Temperature Strength of TiC-Added Mo-Si-B Alloys
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Journal Article
Phase Equilibria, Microstructure, and High-Temperature Strength of TiC-Added Mo-Si-B Alloys
2014
Overview
TiC was added to Mo-Si-B alloys using a conventional Ar arc-melting technique, and the phase equilibria, microstructure evolution, and high-temperature strength at 1673 K (1400 °C) were investigated. The primary phase changed to Mo solid solution (Mo
ss
), Mo
5
SiB
2
(T
2
), or TiC depending on the composition. Following the primary phase solidification, a Mo
ss
+ TiC, Mo
ss
+ T
2
, or Mo
ss
+ T
2
+ TiC + Mo
2
C eutectic reaction took place as the secondary solidification step. In some alloys, Mo
ss
+ T
2
+ TiC and Mo
ss
+ T
2
+ Mo
2
C eutectic reactions were present as higher-order solidification steps. After annealing at 2073 K (1800 °C) for 24 hours, Mo
ss
, T
2
, TiC, and Mo
2
C coexisted stably with microstructural coarsening. The coarsening rate was much faster in an alloy with no TiC dispersion, suggesting that TiC has a strong pinning effect on the grain boundary and interface migration. Compression tests conducted at 1673 K (1400 °C) revealed strength properties of almost all the alloys that were better than those of the Mo-Hf-C alloy (MHC). Alloy densities were 9 g/cm
3
or less, which is lighter than pure Mo and MHC (≥10 g/cm
3
) and competitive with Ni-base superalloys. TiC-added Mo-Si-B alloys are promising candidates for ultrahigh-temperature materials beyond Ni-base superalloys.
Publisher
Springer US,Springer,Springer Nature B.V
