Order-disorder transformation of NiAl induced by mechanical milling.
D.Oleszak, M.Psoda and M.Karolus*
Warsaw University of Technology, Faculty of Material Science and
Engineering, Wol/oska 141, 02-507 Warszawa, PL
* University of Silesia, Institute of Physics and Chemistry of Metals
Bankowa 12, 40-007 Katowice, PL

Mechanical milling (MM) was used to induce order-disorder
transformation of NiAl. The alloy was prepared by arc melting of pure
elements, then crushed and subjected to MM in a Fritsch planetary ball
mill for 36,70 and 120 hours. Samples were studied both by DSC and
X-Ray diffraction. Exothermic effects were observed in the range
500-800K while diffraction patterns shows variation in grains size,
microstresses and long range order (LRO) parameter. The LRO parameter
i.e. classical I[100]/I[200] ratio was correlated with the site
occupation number obtained in the Rietveld refinement procedure using
DBWS-9411.

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