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Magnetic properties of bulk composite FeBSiM (M=Cr,Zr) alloys with high microhardness

Published online by Cambridge University Press:  01 February 2011

S. Báez ,
I. Betancourt ,
M. E. Hernandez-Rojas  and
I. A. Figueroa
S. Báez
Affiliation:
Departamento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, México D.F. 04510, México.
I. Betancourt
Affiliation:
Departamento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, México D.F. 04510, México.
M. E. Hernandez-Rojas
Affiliation:
Departamento de Biotecnología, Departamento de Ingeniería de Procesos e Hidráulica, Universidad Autónoma Metropolitana-Iztapalapa, México D.F. 09340, México.
I. A. Figueroa
Affiliation:
Departamento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, México D.F. 04510, México.
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Abstract

The synthesis, mechanical and magnetic properties of bulk composite Fe72B19.2Si4.8M4 (M=Cr, Zr) alloys obtained by a copper mould injection casting technique under a protective helium atmosphere are reported and discussed. The resultant microstructure of the composite alloys consists of crystalline Fe92Si8 and Fe2B phases embedded in a glassy matrix. The values of microhardness (Hv) show maxima for the alloy containing Cr with 10.24±0.95 GPa. The maximum value of saturation magnetization average (μ0Ms) is 1.25±0.02 T for Cr-containing alloy. The Curie temperatures (Tc) of amorphous phases are higher than 390 K for both alloys. However, the bulk composite alloys presents values for crystallization temperature (Tx) of 1289±10 K and 1140±10 K for Cr and Zr-containing alloys, respectively. These results are interpreted on the basis of the interplay between the crystalline and amorphous phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1276: Advanced Structural Materials–2010 , 2010 , 23
Copyright
Copyright © Materials Research Society 2010

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