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Influence of Co Addition on Magnetic Properties and Glass Formation of Fe-based Amorphous Alloys

Published online by Cambridge University Press:  01 February 2011

Rafael Piccin
Affiliation:
rafael.piccin@unito.it, Università di Torino, Dipartimento di Chimica IFM and NIS, Via P.Giuria, 9, Torino, 10125, Italy, +390116707573, +390116707855
Paola Tiberto
Affiliation:
tiberto@inrim.it, Istituto Nazionale di Ricerca Metrologica INRIM, Strada delle Cacce 91, Torino, 10135, Italy
Nicoleta Lupu
Affiliation:
nicole@phys-iasi.ro, National Institute of Research and Development for Technical Physics, 47 Mangeron Blvd., Iasi, 700050, Romania
Horia Chiriac
Affiliation:
hchiriac@phys-iasi.ro, National Institute of Research and Development for Technical Physics, 47 Mangeron Blvd., Iasi, 700050, Romania
Marcello Baricco
Affiliation:
marcello.baricco@unito.it, Università di Torino, Dipartimento di Chimica IFM and NIS, Via P.Giuria, 9, Torino, 10125, Italy
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Abstract

In the present work, the influence of Co addition on the glass forming ability (GFA) and magnetic properties of the ((Fe1−x Co x )75B20Si5)93Nb4Y3 (x = 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1) alloy is evaluated. Ribbons and 1 mm diameter ingots were prepared by melt-spinning technique and Cu-mold injection casting technique, respectively. The presence of the amorphous phase was confirmed through X-ray diffraction and high temperature differential scanning calorimetry (HT-DSC). Rapid solidification leads to fully amorphous ribbons for all compositions. Conversely, ingots with Co content with x > 0.5 present boride crystalline phases.

Magnetization measurements were performed by means of vibration sample magnetometer in a temperature range from room temperature to 850 °C in order to determine the Curie temperature (TC ) of the amorphous phase and to follow the formation of magnetic phases at high temperatures. In addition, hysteresis loops measurements were carried out to study the magnetic response of the samples. Co substitution until x = 0.5 is seen to simultaneously induce in the as cast ingots a decrease of coercive field from 52 to around 10 A/m and an increase of the Curie temperature of the amorphous phase from 480 to 700 K. A maximum saturation magnetization value of 123 emu/g was observed in the sample having x = 0.2. The role of Co substitution on glass formation is discussed on the basis of crystallization and melting behaviors, analyzed by HT-DSC. Magnetic properties are correlated with the presence of crystalline phases and their microstructures.

Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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