This paper aims at making a comparative study of some soft magnetic material alloys, which are likely to be used in the construction of rotative electrical machines' core or electrical motors. Therefore. this study focus on the building of massive cores. obtained from the conventional powder metallurgy process, also known as sinterized materials. The mechanical properties of hardness and yield stress are analyzed and compared, resulting in an increase of hardness and yield stress due to the influence of diffusion among the elements utilized in the alloys. (c) 2008 Elsevier B.V. All rights reserved.