Thermal Conductivity: Co-Ni, Co-Fe, and Co-Fe-Ni

Using the TCS Ni-based Superalloys Database (TCNI), you can calculate the quantities of a phase φ with the variable THCD(φ), or a system (i.e. alloy) with THCD. You can also calculate the derived quantities, i.e. thermal resistivity (THRS) and thermal diffusivity (THDF), in a similar way.

The database includes thermal conductivity starting with version 11 (TCNI11).

The examples are a sample of calculated thermal conductivity for binary, ternary, and higher-order systems important to Ni-base alloys, compared to experimental values from the literature.

Co-Ni

This plot shows the thermal conductivity of the Co-Ni FCC solution, for varying composition and temperature, compared with experimental data from the literature.

Calculated thermal conductivity of Co-Ni alloys at different temperatures and compositions, compared with experimental data.

Figure 1: Calculated thermal conductivity of Co-Ni alloys at different temperatures and compositions, compared with experimental data [2020Wen].

Co-Fe

This is an example of the calculated thermal conductivity for FCC-Co with up to 8 at% Fe dissolved, compared with estimated data from the literature. Since data is only available for a limited composition range, an approximate fit is deemed good enough with a relatively simple model. Here the thermal conductivity is estimated using the Wiedemann-Franz law based on the electrical resistivity data, therefore discrepancies are expected.

Calculated thermal conductivity for Co95Fe5 and Co92Fe8 alloys compared with estimated data points

Figure 2: Calculated thermal conductivity for Co95Fe5 and Co92Fe8 alloys compared with estimated data points [1979Ben].

Co-Fe-Ni

The calculated thermal conductivity of the Co-Fe-Ni system compared to experimental data from the literature.

Calculated thermal conductivity of equiatomic Co-Fe-Ni compared with experimental data

Figure 3: Calculated thermal conductivity of equiatomic Co-Fe-Ni compared with experimental data [2016Lee; 2017Jin].

Parity of Thermal Conductivity of Selected Systems

Parity plot showing calculated vs experimental thermal conductivity of binaries

Figure 4: Parity plot showing calculated vs experimental thermal conductivity of binaries.

References

[1979Ben] W. Bendick, W. Pepperhoff, Thermally excited states in cobalt and cobalt alloys. J. Phys. F Met. Phys. 9, 2185–2194 (1979).

[2016Lee] J. I. Lee, H. S. Oh, E. S. Park, Manipulation of σ y /κ ratio in single phase FCC solid-solutions. Appl. Phys. Lett. 109, 061906 (2016).

[2017Jin] K. Jin, S. Mu, K. An, W. D. Porter, G. D. Samolyuk, G. M. Stocks, H. Bei, Thermophysical properties of Ni-containing single-phase concentrated solid solution alloys. Mater. Des. 117, 185–192 (2017).

[2020Wen] S. Wen, Y. Liu, G. Kaptay, Y. Du, A new model to describe composition and temperature dependence of thermal conductivity for solution phases in binary alloys. J. Mater. Sci. Technol. 59, 72–82 (2020).