Mechanical Anisotropy of NiAl Alloys Processed by Hot Hydrostatic Extrusion

Zbigniew Witczak; Przemysław Witczak; Ryszard Jemielniak

doi:10.4028/www.scientific.net/MSF.475-479.759

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Mechanical Anisotropy of NiAl Alloys Processed by Hot Hydrostatic Extrusion

Abstract:

Mechanical properties of two stoichiometric NiAl intermetallic alloys processed by hot hydrostatic extrusion were investigated. The ingots for extrusion process were produced both by casting and by powder metallurgy route in which the self-sustained high-temperature synthesis (SHS) of elemental powders was initialized by the process of extrusion itself. Elastic anisotropy of the obtained products were determined using a resonant ultrasound spectroscopy (RUS) in measurements of the elastic constants. The anisotropy of plastic properties was estimated from uniaxial compression tests on specimens cut off from the material in the main directions of previous deformation. An acoustic emission (AE) method of monitoring of the microcracking process in the material was used for estimation the role of cataclastic mechanism of deformation. The effect of annealing of extruded materials on their plastic behavior was roughly investigated.