The density of Ni-Al alloys in both liquid state and solid-liquid coexistence state was measured with a modified pycnometric method. It was found that the density of Ni-Al alloys decreases with increasing temperature and Al concentration in the alloys. The molar volume of liquid Ni-Al binary alloys increases with the increase of temperature and Al concentration. The partial molar volume of Al in Ni-Al binary alloy was calculated approximately. The molar volume of liquid Ni-Al alloy determined in the present work shows a negative deviation from the ideal linear molar volume.
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