Abstract
Precipitates in the diffusion-affected zone (DAZ) during transient liquid phase bonding (TLP) single-crystal superalloys were observed and investigated. Small size and dendritic-shaped precipitates were identified to be M3B2 borides and intergrowth of M3B2/M5B3 borides. The orientation relationships among M3B2, M5B3, and matrix were determined using transmission electron microscope (TEM). Composition characteristics of these borides were also analyzed by TEM energy-dispersive spectrometer. Because this precipitating phenomenon deviates from the traditional parabolic transient liquid phase bonding model which assumed a precipitates free DAZ during TLP bonding, some correlations between the deviation of the isothermal solidification kinetics and these newly observed precipitating behaviors were discussed and rationalized when bonding the interlayer containing the high diffusivity melting point depressant elements and substrates of low solubility.
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Acknowledgments
Thanks Prof. X.L.Ma and Y.L.Zhu for the supporting of TEM analysis. This work was financially supported by the National Basic Research Program (973 Program) of China under grant No. 2010CB631200 (2010CB631206), the National Natural Science Foundation of China (NSFC) under grant No. 50971124, No. 50904059, No. 51071165 and No. 51204156. The authors are grateful for those supports.
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Manuscript submitted April 23, 2014.
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Sheng, N., Hu, X., Liu, J. et al. M3B2 and M5B3 Formation in Diffusion-Affected Zone During Transient Liquid Phase Bonding Single-Crystal Superalloys. Metall Mater Trans A 46, 1670–1677 (2015). https://doi.org/10.1007/s11661-014-2733-z
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DOI: https://doi.org/10.1007/s11661-014-2733-z