Effect of sintering conditions on the magnetic and structural properties of Fe_(0.6)Mn_(0.1)Al_(0.3) synthesized by mechanical alloying

摘要

In order to study the effect of sintering condition on the structural and magnetic behavior of prealloyed metallic powders of Fe_(0.6)Mn_(0.1) Al_(0.3) system, two different thermal treatments were employed. All samples were previously milled and then compacted. Later, the sintering process was carried out in two cycles. For the first one, a sintering time of 2 h was followed by a cooling process governed by the inertia of the furnace. In the second treatment, a sintering time of 0.17 h with a controlled slow ramp of 1 ?C/min between 500 ?C and 250 ?C. All samples were characterized by X-ray diffraction andM?ssbauer spectroscopy. It was found that the sintering time improves the crystallinity while the magnetic behavior was modified by the changes in the cooling rate.