title: Anomalous structural and magnetic behaviour of Fe-25 at.% Ni alloy due to mechanical strain.
abstract: Mechanical strain was induced in Fe-25 at.% Ni alloy by filing the ingots into powder form. The phase transformations induced by the deformation thus caused and subsequent annealing were studied by x-ray diffraction, magnetization measurement and Mössbauer spectroscopy. It is concluded that around one-third of the Fe atoms became segregated from the Fe-Ni alloy due to filing. Annealing of the filed powder led to recombination of this segregated Fe to form an apparently body-centred cubic (bcc) phase of Fe-Ni which shows little magnetic ordering at room temperature in magnetization measurements or in Mössbauer spectroscopy. The single-line Mössbauer spectrum of this phase splits into a six-line pattern below 100 K.
authors: Department of Physics, Indian Institute of Technology, Kanpur 208 016, India.
authors: Brajesh
authors: B
authors: Pandey
authors: H C
authors: HC
authors: Verma