Effect of Mo on microstructure and mechanical behaviour of as-cast Nbss–Nb5Si3 in situ composites
作者： K. Chattopadhyay , G. Balachandran , R. Mitra , K.K. Ray
DOI: 10.1016/J.INTERMET.2006.01.054
关键词:
摘要: Abstract The effect of Mo on the structure–property relationships arc-melted cast in situ composites Nb solid solution (Nbss) and α-(Nb,Mo)5Si3, with hypereutectic Nb–19.1Si–5.2Mo (A) Nb–17.9Si–26.3Mo (B), hypoeutectic Nb–12.8Si–4.1Mo (C) Nb–12.3Si–14.8Mo (D) compositions has been studied. influence concentration lattice constants microhardness constituent phases analyzed. morphology, volume fraction size distribution primary phase eutectic have critically examined related to elastic modulus, hardness fracture toughness composites. Fracture values, determined through three-point bend indentation tests, increase higher amount coarse but decrease increasing content. Indentation cracking exhibits R-curve type behaviour, promoted bridging or arrest cracks by Nbss eutectic. study suggests promise for near-eutectic Nb–Si–Mo ternary system low structural applications.
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