With the advent of powerful mathematical modeling techniques for material phenomena,there is renewed interest in reliable data for the density of the Ni-based superalloys.Up to now,there has been few report on the density of molten Ni-Co alloy.In order to obtain more accurate density data for molten Ni-Co alloy,the density of molten Ni-Co alloy was measured with a modified sessile drop method,and the accommodation of different atoms in molten Ni-Co alloy was analyzed.The density of alloy is found to decrease with increasing temperature and Co concentration in the alloy.The molar volume of molten Ni-Co alloy increases with increasing Co concentration.The molar volume of Ni-Co alloy determined shows a positive deviation from the linear molar volume,and the deviation of molar volume from ideal mixing increases with increasing Co concentration over the experimental concentration range.
