Abstract
A numerical forward simulation technique is used to calculate the concentration-dependent interdiffusion coefficient \(\left( {D = F\left( c \right)} \right)\) during transient liquid phase (TLP) bonding, without the assumption of initial step-function of concentration in space that renders conventional methods like the Boltzmann–Matano, Sauer–Freise, Wagner, and Hall methods unsuitable for this purpose. In contrast to what is commonly assumed, the experimental results confirm that \(D = F\left( c \right)\) can indeed change with time during TLP bonding, which affirms that the use of a straight line of best fit to represent the relationship between isothermal solidification width and square root of time during TLP bonding, as commonly done in the literature is only valid, provided that \(D = F\left( c \right)\) is verified to be time-independent. Furthermore, anomalous reduction of diffusivity with the increase in temperature during TLP bonding is observed and reported for the first time in this work, which causes the extent of isothermal solidification to reduce with the increase in bonding temperature. The observed reduction in diffusivity with the increase in temperature, in contradiction to what is normally expected based on the common diffusion Arrhenius relationship, is due to the nature of concentration dependence of diffusivity and reduction of solubility with the increase in temperature. Therefore, the common simplistic approach of assuming that interdiffusion coefficient is constant and independent of concentration during TLP bonding can have significant consequences in relation to proper understanding and explanation of TLP bonding behavior.
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The authors gratefully acknowledge financial support by the NSERC of Canada.
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This work was supported by the Natural Sciences and Engineering Research Council of Canada.
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Afolabi, O.C., Sada, H., Olaye, O. et al. Calculation and Use of Variable Diffusivity for the Analysis of Transient Liquid Phase Bonding Behavior. Metall Mater Trans A 53, 3392–3403 (2022). https://doi.org/10.1007/s11661-022-06755-6
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DOI: https://doi.org/10.1007/s11661-022-06755-6