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Interfacial characteristics of molten Bi-43Sn alloy on amorphous and crystalline Fe(78)B(13)Si(9) during wetting were investigated at 523 K, 573 K, 623 K and 673 K. It is found that an intertnetallic compound exists at the interface of Bi-43Sn alloy on amorphous FC(78)B(13)Si(9), while no intermediate reaction layer is formed at the interface of Bi-43Sn alloy on crystalline Fe(78)B(13)Si(9). For Bi-43Sn alloy/amorphous Fe(78)B(13)Si(9) system, isothermal aging was performed at 323 K, 373 K and 423 K. The layer growth of the intermetallic compound is mainly controlled by a diffusion-controlled mechanism in the temperature range studied because the values of time exponent (n) is approximately equal to 0.5. (c) 2007 Elsevier B. V. All rights reserved.