Strongly driven crystallization processes in a metallic glass

LaGrange, Thomas; Grummon, David S.; Reed, Bryan W.; Browning, Nigel D.; King, Wayne E.; Campbell, Geoffrey H.
May 2009
Applied Physics Letters;5/4/2009, Vol. 94 Issue 18, p184101
Academic Journal
The crystallization of amorphous NiTi thin films was studied in situ using pulsed laser heating in a dynamic transmission electron microscope. A single pulse can crystallize small areas of the film within 2 μs. The crystallized volume fraction and morphology depend strongly on the laser energy, the laser spatial profile, and the heat transport in the film. As compared to slower furnace and continuous wave laser annealing, pulsed laser heating produces a dramatically different microstructure. Higher than expected crystallization rates were observed under pulsed irradiation that do not correlate with kinetic data obtained from the slow-heating crystallization experiments.


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