ESTIMATING DENSITIES OF LIQUID TRANSITION-METALS AND NI-BASE SUPERALLOYS

To estimate the densities of liquid Ni-base superalloys, the densities and temperature coefficients of density (d rho/dT) of the liquid tran sition-metals, which are used as alloy elements in Ni-base superalloys , were gathered, reviewed, and applied to a simple correlation. The co rrelation is particularly useful to estimate d rho/dT of many transiti on-metals for which there are no data available. To demonstrate how th e results can be applied, the densities of liquid Ni-rich Ni-Al-Cr-Ta alloys were considered and regressed to yield the liquid density as a function of temperature anti composition. As a verification of this ap proach, the liquid densities of five Ni-base superalloys were also est imated. By including a regression estimate of the molar mixing volume, the estimates of the liquid densities agreed with the measured values to +/- 2.5%. (C) 1997 Elsevier Science S.A.