Abstract:

he paper reports on the effect of Mn substituting  for Fe on the magnetostrictive and related properties of Fe_81-xMn_xAl₁₉ (x=0~24) alloys by melting. The doped samples   were prepared in polycrystalline form and were all single phase bcc. The experimental results show  that the magnetostriction observed for  Fe₈₁Al₁₉ can’t be enhanced by doped Mn at a maximum   of x=24 because of the appearance of the ordered D0₃ phase. The change in the magnetostrictive coefficient of Fe₈₁Al₁₉ with Mn doping  is accompanied by a monotonic increase in resistivity, which is good for reducing the eddy current and useful for magnetic actuator application. We also found that the lattice parameter of the alloys increased with the increase in Mn concentration and the Curie temperature decreased monotonically at the same substitution.

Key words: Fe-Al alloy, body-centred cubic, magnetostriction, resistivity