High-throughput measurements of interdiffusivity matrices in face centered cubic Ni-Al-Mo alloys at 1273-1473 K
Abstract
Based on 15 diffusion couples located in face centered cubic single-phase region of ternary Ni-Al-Mo system, high-throughput determination of composition-dependent interdiffusivity matrices at 1273, 1373, and 1473 K was performed by using the recently developed numerical inverse method. The determined main interdiffusivities over the investigated composition and temperature ranges are all positive, and D∼AlAlNi is generally larger than D∼MoMoNi. Moreover, D∼AlAlNi generally increases with concentration of Al, while D∼MoMoNi increases with concentrations of both Al and Mo. In contrast, the cross interdiffusivities can be either positive or negative. Average relative errors of D∼AlAlNi,D∼AlMoNi,D∼MoAlNi , and D∼MoMoNi were evaluated to be 2.4, 5.1, 16.1, and 1.7% using error propagation. Furthermore, our prediction of composition profiles and interdiffusion fluxes based on evaluated interdiffusivity matrices agrees quite well with measured data. Traditional Matano-Kirkaldy method was also applied to further verify the reliability of obtained interdiffusivities. Besides, three-dimensional planes of activation energies of main interdiffusivities were also evaluated using the Arrhenius equation.
- Publication:
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Journal of Materials Research
- Pub Date:
- June 2017
- DOI:
- 10.1557/jmr.2017.44
- Bibcode:
- 2017JMatR..32.2188W