Grain Refinement of Combustion-synthesized NiAl by Addition of AL_2O_3 Particles
An intermetallic compound of mononickel aluminide (NiAl) is combustion-synthesized from a mixture of nickel and aluminum powders by a pseudo-Hot-Isostatic-Pressing (pseudo-HIPing) method. The effects of the addition of alumina (Al<sub>2</sub>O<sub>3</sub>) particles on the microstructure and mechanical properties of the combustion-synthesized NiAl is investigated. The density and hardness of the NiAl significantly increase with increasing pseudo-HIPing pressure applied during the combustion synthesis. The increase in the volume fraction of the added Al<sub>2</sub>O<sub>3</sub> particles leads to a slight decrease in the density of the NiAl, but it does not affect the hardness. The grain size of NiAl decreases, as the volume fraction of the added Al<sub>2</sub>O<sub>3</sub> particles increases and as the size of the Al<sub>2</sub>O<sub>3</sub> particles decreases.
- ISIJ international
ISIJ international 37(1), 87-92, 1997-01-15
The Iron and Steel Institute of Japan