In-situ synthesis and rapid consolidation of fully dense MoSi2

Raman, R. V.; Rele, S. V.; Paskowitz, Michael J.

doi:10.1007/bf03223368

Cited by 4 publications

(4 citation statements)

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“…6 nm) in the Mo 5 SiB 2 phase, followed by n110m, while the {001} plane is ranked second in density of packing. TEM studies on crept specimens by Field et al 139 have shown evidence of dislocations with Burgers vectors of [100], and 1/2 [111], which differ from those observed in the multiphase composites with Mo 5 SiB 2 as a constituent. 138…”

Section: Mo 5 Simentioning

confidence: 93%

“…Silicides and silicide-based composites may be synthesised by a variety of processes including self-propagating high temperature syntheses, [82][83][84][85][86][87] shock wave syntheses, 88 mechanical alloying, [89][90][91][92][93] plasma spray processing, [94][95][96][97][98] or in situ solid state displacement reactions, [99][100][101][102][103][104] which give rise to powders, porous or dense compacts as finished products. The methods used for consolidation of powders include conventional hot pressing of mixtures of commercially available powders, [22][23][24][25] reactive hot pressing of elemental powders, 26,46,[105][106][107][108] hot isostatic pressing, 109,110 Ceracon process, 111 sintering in absence of pressure, 112,113 liquid phase sintering under pressure, 26,46 or spark plasma sintering, 114,115 as well as extrusion 116,117 and injection moulding.…”

Section: Processingmentioning

confidence: 99%

“…05u. The [001], 1/2 [111], 1/2 [331] and [110] directions in the C11 b (110) The tetragonal structure of Mo 5 Si 3 is quite different with respect to that of MoSi 2 (Fig. 2a and b may be compared), as the former exhibits the following characteristics: 31 (i) the a-lattice parameter is larger than its clattice parameter (a/c<2), (ii) close-packed planes are absent, and (iii) the -Si-Mo-Si-chains are along the [100] and [010] directions, while the -Mo-Mo-and -Si-Sichains are along the [001] direction.…”

Section: Molybdenum Silicidesmentioning

confidence: 99%

“…The Mo 5 Si 3 single crystals have been compression tested with stress axes near [101] and [111], and along [100] and [001] crystallographic directions. 30 The tests have shown the brittle-to-ductile temperature to be around 1250uC, and the flow curves have upper and lower yield points in the case of [101] and [100] orientations, as is expected when the density of mobile dislocations is low.…”

Section: Mo 5 Simentioning

confidence: 99%

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Mechanical behaviour and oxidation resistance of structural silicides

Mitra¹

2006

International Materials Reviews

255

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The need for high performance materials in aerospace, automotive and industrial components operating at temperatures in the range of 1100-1500uC has led to a surge in the research and development of the refractory metal silicide based intermetallics, multiphase alloys and composites. The silicides of Mo, W, Ti, Nb and Cr are attractive for high melting points, strength retention and ductile behaviour, combined with reasonable to excellent oxidation resistance at elevated temperatures. The major limitation to the widespread use of structural silicides is their inherent brittleness and poor fracture toughness at room temperature, which may be improved further by suitable alloying or tailoring composite microstructures or use of innovative processing routes. The high temperature deformation behaviour of the structural silicides is complex, and depends on the composition and alloy content, crystal structure, character of bonding and orientation, microstructural constitution (nature of phases present and volume fraction), and grain size. Over the past decade, the basic character and role of dislocations involved in the deformation of single or polycrystalline samples at different temperatures and strain rates, including creep conditions, have been investigated in order to understand the operating mechanisms and decide on the strategies to further improve the mechanical properties. Oxidation behaviour in different structural silicides has been studied with emphasis on the constitution of the oxide scale and the kinetics of oxidation under different temperature regimes, which also involve pest disintegration at intermediate temperatures. The present study is a review with a comparative assessment of the known mechanisms of deformation, fracture and oxidation along with strategies to improve the properties to the targeted levels and some of the emerging applications of structural silicides.

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