Abstract
Mechanical alloying in high-energy ball-milling machine was used to fabricate the NiAl shape memory alloy. The effect of milling time on the mechanical properties was investigated. The microstructures and phase transformations of NiAl were studied by scanning electron microscope (SEM), x-ray diffraction (XRD), differential scanning calorimetry (DSC) and dynamic thermal analysis (DTA). Lamella micro-structures was found in the SEM examination and they were confirmed to have the martensite structure by XRD analysis. Results from DSC thermal analysis revealed that the sintered-compact exhibited thermoelastic transformation. Besides, the martensitic transformation was found to have suppressed by the presence of Ni 5 Al 3 precipitates in some of the ball-milled specimens.
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