Young's modulus (E) for ten specimens of ordered polycrystalline Ni-Al has been measured using PUCOT (Piezoelectric Ultrasonic Composite Oscillator Technique). The modulus has been determined in the composition range 43.94 to 52.70 atomic percent Al and temperature interval 300 to 1300 K. Anomalous dependence on composition and temperature has been found, where the modulus does not always decrease linearly with temperature and does not show the expected maximum near the stoichiometric composition. Nonetheless, these materials show remarkable stiffness, where the modulus clusters near 230 GPa at ambient temperature and decreases to about 180 GPa at 1300 K in this composition range.
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