Phase changes in Fe72−x
Al28Cr
x
(x = 0,2,4,6) alloys due to mechanical strain |
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Authors: | Brajesh Pandey H C Verma |
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Institution: | (1) Department of Physics, Indian Institute of Technology, 208 016 Kanpur, India |
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Abstract: | Fe72−x
Al28Cr
x
(x = 0,2,4,6) are made by arc melting a mixture of constituent elements in stoichiometric proportion, in argon atmosphere. The
ingots so obtained are filed to make powder samples thereby giving them substantial mechanical deformation. It is observed
that as-powdered samples show hyperfine field distribution typical of α-phase, where the atoms are randomly distributed on
the available sites. Annealing at 900°C for 60 h leads to preferential occupation of lattice sites by the atoms and this results
in better defined groups of hyperfine magnetic field (HMF) which can be associated with specific configuration in the neighbourhood
of probe iron atoms. The average HMF is found to decrease sharply with increasing Cr concentration even though the net chromium
concentration remains low (≤6 at%). The results show that cold working on samples is very important in changing the atomic
ordering and must be taken into account if properties of equilibrium phases are probed. |
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Keywords: | Iron aluminides M?ssbauer spectroscopy phase transformation mechanically driven transformation |
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