Structural and magnetic properties of leached bcc Ni produced by rod milling

Nanocrystalline Al-60 Ni-40 and Ni have been obtained by rod milling Al and Ni powder mixtures and chemically leaching Al atoms from rod-milled Al60Ni 40. The rod-milled alloy powders retained their bcc structure after being t reated at 85 degrees C with a 30 wt% KOH solution. On cooling of the specim en from 600 degrees C, spontaneous magnetization sharply increased at about 350 degrees C, indicating that the bcc phase was transformed to fee phase. DC magnetic susceptibility measurements showed a single transition from th e paramagnetic to the spin glass state below 45 K (T-f) The temperature beh avior at T-f was quite different from field cooling (FC) and zero-held cool ing (ZFC).