High Temperature Aluminides and Intermetallics

This volume of proceedings is concerned with an increasingly important area, that of intermetallics and high temperature aluminides, which has recently been attracting a great deal of attention. Nearly 150 papers presented at the meeting held in San Diego in September 1991 are reproduced here. They cover a wide range of related topics such as the bonding characteristic and alloying behaviour of TiA1 intermetallic compounds and the cleavage fracture of ordered intermetallic alloys. All the papers have been reviewed according to the standards set by Materials Science and Engineering. This book will be of interest to metallurgists and materials scientists working with composites who are interested in the latest developments in this fast-moving field.

A SELECTION OF PAPERS PRESENTED. Alloy Stability. A first-principles study of phase stability in Ni-AI and Ni-Ti alloys. Thermodynamic calculation of the ternary Ti-AI-Nb system. Phase Transformations. Intermetallic Ti-AI-Nb alloys based on strengthening of the orthorhombic phase by w-type phases. Influence of an increasing content of molybdenum on phase transformations of Ti-AI-Mo aluminides -relation with mechanical properties. Deformation. The effect of orientation and lamellar structure on the plastic behaviour of TiAI crystals. An atomistic study of dislocations and their mobility in a model DO22 alloy. Mechanical Properties. Improvement in ductility of Ni3AI by y former doping. Mechanical properties of advanced nickel aluminides. Point Defects and Dislocations. Studies of vacancies and dislocations in TiAI by positron annihilation. Dissociation of superdislocations in single crystal L1oTi-AI-V compounds. Microstructure. Mechanical behaviour of ion-irradiated ordered intermetallic compounds. Three-phase [&bgr; + &bgr;' + y'] Ni-AI-Ti-[Cr,Fe] alloys for high temperature use. High Temperature Deformation and Mechanical Properties. New concepts of analyzing plastic deformation of TiAI and Ni3AI intermetallic compounds. Mechanical properties of boron-doped directionally-solidified Ni3AI containing carbon, magnesium, calcium and rare earth elements. Creep and Superplasticity. Creep in titanium aluminides. Different origins of grain size and composition effects on creep in TiAI. Fatigue and Fracture. Cleavage fracture of ordered intermetallic alloys. Fatigue crack propagation resistance of ductile TiNb-reinforced y-TiAI intermetallic matrix composites. Oxidation and Environmental Embrittlement. Elevated-temperature environmental embrittlement and alloy design of L12 ordered intermetallics. The oxidation behavior of intermetallic compounds. Composites. Mechanical behavior of a fiber reinforced Ni3AI matrix composite. Micromodelling of crack growth in fibre reinforced composites. Novel Processing. Synthesis, processing and properties of nanophase aluminide. Nanocrystalline intermetallic compounds - structure and mechanical properties. Industrial Applications. Processing of nickel aluminides and their industrial applications. Development of castable TiAI alloy for turbine components. Index.A FULL LIST OF PAPERS IS AVAILABLE ON REQUEST TO THE PUBLISHER