Structural, mechanical and magnetic properties in heat-treated Fe73.5Si22.5-xBxNb3Cu1 (6<=x<=12) alloy ribbons

J. MOYA; M. VÁZQUEZ; V. CREMASCHI; B. ARCONDO; H. SIRKIN

NANOSTRUCTURED MATERIALS

E

Año: 1997 vol. 8 p. 611 - 621

0965-9773

The evolution of structural (X-ray, Mossbauer spectroscopy), mechanical (Young's modulus, DeltaE effect) and magnetic (hysteresis loops) properties of Fe735Si225-x BxNb3CU1(6􀁚x 􀁚 12) alloy ribbons is followed after heating at increasing temperatures, Ta, up to full devitrification of the amorphous precursors into a nanocrystalline state. Overall modifications in structure corre late with magnetic and mechanical characteristics, which are analyzed through the induced changes in parameters as internal stress and magnetostriction. Relaxation of amorphous structure (Ta =440 oC ) results in magnetic softening and increase of AE effect. First stages of crystallization (Ta = 480°C), including a Cu clustering, induces a relative magnetic hardening and reduction of AE effect. Optimum nanocrystalline state (Ta =540 ce) with the softest magnetic behavior /eads to afinal in crease of Young's modulus. The influence of relative weights of Si and B is also analyzed.