High-throughput measurements of interdiffusivity matrices in face centered cubic Ni–Al–Mo alloys at 1273–1473 K. Issue 11 (13th February 2017)

• Record Type: Journal Article
• Authors: Wen, Shiyi; Tang, Ying; Zhong, Jing; Zhang, Lijun; Du, Yong; Zheng, Feng
• Is Part Of: Journal of materials research. Volume 32:Issue 11(2017)
• Page Start: 2188
• Page End: 2201
• Publication Date: 2017-02-13
• Subjects: diffusion, -- alloy, -- kinetics; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2017.44
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: 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 $\tilde D_{{\rm{AlAl}}}^{{\rm{Ni}}}$ is generally larger than $\tilde D_{{\rm{MoMo}}}^{{\rm{Ni}}}$ . Moreover, $\tilde D_{{\rm{AlAl}}}^{{\rm{Ni}}}$ generally increases with concentration of Al, while $\tilde D_{{\rm{MoMo}}}^{{\rm{Ni}}}$ increases with concentrations of both Al and Mo. In contrast, the cross interdiffusivities can be either positive or negative. Average relative errors of $\tilde D_{{\rm{AlAl}}}^{{\rm{Ni}}}$, $\tilde D_{{\rm{AlMo}}}^{{\rm{Ni}}}$, $\tilde D_{{\rm{MoAl}}}^{{\rm{Ni}}}$, and $\tilde D_{{\rm{MoMo}}}^{{\rm{Ni}}}$ 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.