Deformation Behavior of Niobium Silicides during High Temperature Compression
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1128-U07-05
Deformation Behavior of Niobium Silicides during High Temperature Compression N. Sekido1, S. Miura2, Y. Yamabe-Mitarai1, Y. Kimura3, and Y. Mishima3 1
National Institute for Materials Science, Tsukuba 305-0047, Japan
2
Division of Materials Science and Engineering, Hokkaido University, Sapporo 060-8628, Japan
3
Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama 226-8502,
Japan
ABSTRACT Deformation behavior of (Nb)/α–Nb5Si3 two-phase alloys is examined by high temperature compression tests. The alloys exhibit brittle fracture behavior at temperatures up to 1473 K, while reasonable compressive deformability at 1673 K. Upon high temperature compression of the alloys, the flow stress gradually decreases after the peak stress due to the recrystallization/recovery in the (Nb) phase, as well as the increase in the density of mobile dislocations within the α–Nb5Si_3 phase. Two types of slip systems that operate in α–Nb5Si3 have been identified as {011)
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