High Temperature Structural Silicides: Proceedings of the 1st Workshop, Gaithersburg, MD, USA, 2-6 November 1991

The aim of this volume is two-fold. Firstly, to give a current overview on silicide-based structural materials and identify important and promising future research directions. Secondly, it is intended to serve as a catalyst for the expansion of research and development activities in this new field, promoting rapid technology transfer to private industry. Elevated temperature structural materials represent a key enabling technology for many aspects of advanced aerospace, automotive, energy and environmental systems. High temperature structural silicides constitute an important new class of such materials. Central aspects for the development of structural silicides are improvements in both high and low temperature mechanical properties, with retention of oxidation resistance. Recent composite and alloying approaches have demonstrated significant success in addressing these issues. The optimum development of structural silicides requires the combined efforts of both ceramists and metallurgists owing to their mixed metallic - covalent - ionic atomic bonding state. The contents of this volume will be of interest to both the metallurgical and ceramics communities.

Table of Contents:
Silicide Materials. A comparative overview of molybdenum disilicide composites (A.K. Vasudevan, J.J. Petrovic). Development of continuous fibre reinforced MoSi2 base composites (M.J. Maloney, R.J. Hecht). Application of ternary phase diagrams to the development of MoSi2 based materials (W.J. Boettinger et al.). Appraisal of other silicides as structural materials (D.M. Shah et al.). Processing and properties of Nb5Si3 and tough Nb5Si3 / Nb laminates (J. Kajuch et al.). Engineering limitations of MoSi2 coatings (T.A. Kircher, E.L. Courtright). Processing. Synthesis of molybdenum disilicide by mechanical alloying (R.B. Schwarz et al.). Fabrication, structure and properties of MoSi2 base composites (D.E. Alman et al.). Vacuum plasma spraying of MoSi2 and its composites (R. Tiwari et al.). Ductile phase toughening of molybdenum disilicide by low pressure plasma spraying (R.G. Castro et al.). Synthesis of a MoSi2 SiC composite in situ using a solid state displacement reaction (C.H. Henager et al.). Synthesis of MoSi2 single crystals (T.A. Lograsso). Relationship Between Processing and Mechanical Properties. Strengthening of discontinuously reinforced MoSi2 composites at high temperatures (R.M. Aikin, Jr.). Interfacial modification in Nb/MoSi2 composites and its effects on fracture toughness (L. Xiao, R. Abbaschian). Mechanical behaviour and interface design of MoSi2 based alloys and composites (R. Gibala et al.). Effects of carbon additions on high temperature mechanical properties of molybdenum disilicide (S.A. Maloy et al.). Oxidation. Oxidation of MoSi2 and comparison with other silicide materials (D.A. Berztiss et al.). Oxidation of MoSi2 based composites (J. Cook et al.). Oxidation behaviour of tungsten and germanium-alloyed molybdenum disilicide coatings (A. Mueller et al.). Creep. Tensile creep of silicide composites (S.M. Wiederhorn et al.). Engineering aspect of creep deformation of molybdenum disilicide (S. Bose). Creep of molybdenum disilicide composites (K. Sadananda et al.). Micromechanics. Dislocations, twins, grain boundaries and precipitates in MoSi2 (T.E. Mitchell et al.). Room temperature micro indentation of single crystal MoSi2 (P.H. Boldt et al.). ZrO2 and ZrO2 SiC particle reinforced MoSi2 matrix composites (J.J. Petrovic et al.). Modeling of transformation toughening in brittle materials (R. LeSar et al.). Author index. Subject index.