Gille, Peter; Bauer, Birgitta
Single crystal growth of Al13Co4 and Al 13Fe4 from Al-rich solutions by the Czochralski method.
In: Crystal Research and Technology, Vol. 43, No. 11: pp. 1161-1167
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Czochralski growth of large metallic alloy single crystals of Al 13Co4 and Al13Fe4 from Al-rich solutions has been demonstrated for the first time. A detailed description of all decisive steps of the growth procedure is given with particular emphasis to seeding from a native phase as well as spontaneous nucleation if no seed crystal from a preceding experiment is available. Czochralski growth in a high-temperature solution system requires much lower pulling rates compared to typical growth experiments from the melt and a time-dependent temperature program to compensate the change of the liquidus temperature that results from the permanently increasing Al content of the liquid phase. With a given amount of the initial melt, the size of the Al13Co4 crystals is limited by the rather narrow temperature range of the Al13Co 4 primary crystallization window, followed by Al9Co 2 phase crystallization. In the Al-Fe system, despite the huge temperature range of equilibrium between Al13Fe4 and its Al-rich melt, Czochralski growth of Al13Fe4 is restricted to higher temperatures due to the limited solubility that leads to mother liquid inclusions even at extremely low pulling rates.