- Swiston, A. J. and Besnoin, E. and Duckham, A. and Knio, O. M. and Weihs, T. P. and Hufnagel, T. C., Thermal and microstructural effects of welding metallic glasses by self-propagating reactions in multilayer foils,
ACTA MATERIALIA, vol. 53 no. 13
pp. 3713--3719 [doi] .
(last updated on 2011/07/05)
We have previously demonstrated that Zr-based metallic glass components can be welded using the heat produced by self-propagating exothermic reactions in multilayer metallic foils. Here, we examine the evolution of the temperature field during reactive joining of bulk amorphous Zr57Ti5Cu20Ni8Al10, as well as the microstructure of the resulting joints. Numerical simulations predict that the metallic glass near the glass/foil interface heats very rapidly (similar to 10(7) K s(-1)) to temperatures of similar to 1350 K, well above the liquidus temperature of the amorphous alloy (similar to 1115 K), followed by rapid cooling (similar to 10(5) K s(-1)) once the reaction front has passed. The maximum temperature, heating rate, and cooling rate of the glass all decrease with increasing distance from the interface. Infrared measurements of the temperature of the metallic glass components during joining show that the cooling rate exceeds the critical cooling rate of the alloy. Optical and scanning electron microscopy reveal no evidence of crystallization of the glass components due to the joining process. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.