Elasticity in nanocrystalline Nd2Fe14B+aFe magnetic composites

S. URRETA, H. SALVA, A. GHILARDUCCI, O. BILLONI, L. FABIETTI

PHYSICA B - CONDENSED MATTER

Año: 2002 p. 297 - 299

0921-4526

The dynamic Young modulus (E) of magnetic Nd2Fe14B+aFe nanocomposites is investigated with mechanical spectroscopy techniques (vibrating reed configuration, fE1:5 kHz eo10^6). Reduced values of E are obtained (88 – 152 GPa) as compared with that predicted by the rule of mixtures for the composite (164 GPa). Three contributions to this reduction are briefly discussed: a large volume fraction of the specimen with grain boundary like structure; internal pores, resulting from the high cooling rate during processing (B106 K=min) and magneto-mechanical effects. Evenwhen porosity is identified as the principal cause of modulus reduction, magnetic effects are also detected.