Reactive Current-Activated Tip-Based Sintering of Ni–Al Intermetallics

Green Compact Temperature Evolution during Current-Activated Tip-Based Sintering (CATS) of Nickel

Current-activated tip-based sintering (CATS) is a novel process where spark plasma sintering conditions are applied through an electrically conducting tip on a locally controlled area on a green powder compact/bed. The localization of electric current in CATS allows for unique temporal and spatial current and temperature distributions within the tip and powder compact. In this paper, special ex...

Reactive Infiltration Processing and Secondary Compressive Creep of NiAl and NiAl-W Composites

Reactive infiltration processing was used to fabricate bulk NiAl and fiber-reinforced NiAl composites. Homogenous, pore-free materials were obtained by chemical reaction between nickel and aluminum after complete infiltration with liquid aluminum of preforms of nickel wires (containing tungsten wires for the composites) with low surface-to-volume ratio, high permeability, and regular infiltrati...

Reactive Infiltration Processing and Compression Creep of NiAl and NiAl Composites

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Equilibrium Point Defects in Nial and Similar B2 Intermetallics Studied by Pac

Point defects in NiAl and other structural intermetallics have been studied using perturbed angular correlation of gamma rays (PAC), by which signals are detected from antisite atoms and/or lattice vacancies in the first few atomic shells of probe atoms. For samples of quenched NiAl having 50 to 54 at.% Ni, site-fractions of Ni-vacancies (proportional to the vacancy concentration) were found to...

Microwave Assisted Reactive Sintering of Zirconium Oxynitrides