Microstructure dependence of the magnetic properties in fine Mg–Tm (Tm: Co, Fe) particles by using a mechanical alloying technique

Abstract

The purpose of this work is to understand a behavior of the microstructural and the magnetic properties of magnesium and 3d-transition metal alloys with because of which there is a difficulty of alloying thus by the conventional method a positive value of mixing enthalpy. Magnesium and, iron or cobalt powders were successfully alloyed with a wide range of compositions by mechanical alloying and characterized as synthesized alloys. The obtained Mg–Fe alloys with a composition less than 25 at% Mg were in single phase BCC with expanded lattice parameter. The variation tendency in lattice parameter and the coercive force with Mg composition were opposite. The microstructure of Mg–Co powders implies that the alloy could be partially amorphized or they could form a nano-sized morphology as expected.