Single Crystal Growth and Mechanical Properties of MoSi2 and WSi2

In Situ Processing and Properties of SiC/MoSi2 Nanocomposites

“…28.0MoSi 2 The reactant compositions are based upon the MoSi 2 and PCS starting composition. The amounts of Si, C, and H 2 are based upon the PCS pyrolysis yield reported by Yajima et al 7 The amount of oxygen is calculated from the SiO 2 content (8 vol%) in the hot-pressed monolithic MoSi 2 (Fig.…”

“…To improve the mechanical properties of MoSi 2 , researchers have used second-phase reinforcements such as whiskers, particulates, and platelets of various carbides, borides, and oxides. [1][2][3][4][5] Although improved strength and toughness were obtained by these additions, the results did not completely meet the requirements for advanced aerospace and transportation systems.…”

Mechanical behaviour and oxidation resistance of structural silicides

“…97 Multiphase Mo-Si-B alloys processed through an industrial technique used by Plansee 118 for refractory alloys, involving cold pressing of intimate mixture of elemental powders, followed by pressure-less sintering in a hydrogen environment, and hot isostatic pressing have demonstrated promising results. 119 Ingot metallurgy processing methods include arc melting, 120,121 induction skull melting, 68 XD processing, [122][123][124][125] directional solidification, 126 single crystal growth, 42,80,127 and investment casting. 73,74 Conventional methods of single crystal growth such as Bridgman or Czochralski techniques cannot be used because of the high melting point of silicides.…”

“…Hence alternative processes involving electron beam float zone, inductively coupled plasma pedestal growth, and induction float zone in atmospheric and pressurised chambers have been developed for producing single crystals of the high melting silicides. 42,80,127 As cast or powder processed silicides may be subjected to subsequent heat treatments, or deformation processing for microstructural refinement, which improve the mechanical properties further, particularly in the multiphase Mosilicides 117 or Nb-silicides. 52,126 In powder metallurgy processing of MoSi 2 , the grain size increases with increase in the temperature of hot compaction, 22,128 which is certainly expected.…”

“…In spite of the fact that crystal structure, lattice parameters, melting point, coefficient of thermal expansion, elastic constants and electronic structure of WSi 2 are very similar to those of MoSi 2 , the plastic deformation behaviour differs significantly. The studies on deformation behaviour of single crystals of WSi 2 by Kimura and co-workers 41,42 have indicated that single crystals of WSi 2 oriented near the n001m and n100m directions exhibit plastic flow at 1300uC and above, with slip occurring on the {01 ¯3}n331m and {11 ¯0}n331m systems, respectively (Table 15). In addition, stacking faults have been observed in the {110} planes.…”