Advancement of the Directional Solidification process of a NiAl-Alloy


The directional solidification process of high temperature intermetallic alloys was investigated and discussed for a hypo eutectic NiAl-Cr-alloy. An unexpected solidification behavior was found which may be peculiar to the selected alloy group. The attempts show that due to the required high furnace temperatures only a narrow range of tolerance exists, in which the variation of the process parameters led to directional solidification. Aligned primary NiAl dendrites were then observed, embedded in randomly oriented interdendritic lamellas as known from conventional equiaxed castings. The directional solidification process was basically evaluated for high temperature intermetallics.

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The work was promoted by funds by Deutsche Forschungsgemeinschaft through Sonderforschungsbereich 561 (SFB 561). The responsibility for the content of this publication lies with the authors.

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Scheppe, F., Wagner, I. & Sahm, P. Advancement of the Directional Solidification process of a NiAl-Alloy. MRS Online Proceedings Library 646, 468–473 (2000).

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