Abstract
Abstract A study of the mechanical and magnetic hardening of the Alnicos has shown that two distinct mechanisms are at the origin of the two types of hardening.The considerable lag of the increase in coercive force with respect to that of hardness supports the hypothesis that single domain behaviour of a magnetic precipitate is the primary cause of the magnetic hardening in this alloy.The mechanical hardening on the other hand can be accounted for semiquantitatively by Cahn's evaluation of the stresses induced by spinodal decomposition. Resume Une etude des cinetiques de durcissements structural et magnetique des Alnicos a permis de distinguer deux causes de ces durcissements.Le retard considerable qu'accuse l'augmentation de la force coercitive par rapport a celui de la durete apporte une evidence supplementaire quant a la validite de l'hypothese d'un comportement en monodomaines d'un precipite ferromagnetique comme etant la principale cause du durcissement magnetique dans cet alliage.Quant au durcisseme...
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