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Preparation and characterization of Fe-(Cr,Mo,Ga) (P,C,B) soft magnetic bulk metallic glasses

M. STOICA1,2,* , J. ECKERT3, S. ROTH1, L. SCHULTZ1, A. R. YAVARI2

Affiliation

  1. IFW Dresden, Institute for Metallic Materials, P.O. Box 270016, D-01171 Dresden, Germany
  2. LTPCM-CNRS UA29, ENSEEG, Institut National Politechnique de Grenoble, Domain Universitaire, 1130 Rue de la Piscine, BP 75 Saint Martin d’Hères Campus 38402, France
  3. TU Darmstadt, Department of Materials and Earth Sciences, Physical Metallurgy Division, Petersenstrasse 23, D-64287 Darmstadt, Germany

Abstract

Using master alloys with nominal compositions Fe77.5-x-y-zCrxMoyGazP12C5B5.5 (x,y,z = 4,4,4; 4,4,2; 4,4,0 and 2,2,2), cylindrical rods up to 3 mm in diameter and 70 mm in length, rectangular bars 2 × 2 mm and 30 mm length and discs with 10 mm in diameter and 1 mm thickness were produced using the copper mold casting technique. By powder metallurgical methods, pellets with even larger dimensions (10 mm in diameter and 3-5 mm in thickness) were prepared. Compression tests reveal that the fracture strength for the as-cast samples σf is around 3 GPa and the fracture strain εf reaches 2 %. Upon annealing, the fracture strain drops to 1.6 % and no plastic deformation is observed while the fracture stress remains almost the same. The coercivity of the as-cast samples is lower than 10 A/m, decreasing to 0.7 A/m upon annealing. The coercivity of as-milled powder is greater than 1000 A/m, and it decreases to 25 A/m after hot compaction and subsequent annealing, although the latter value is one order of magnitude higher than those for cast samples..

Keywords

Bulk metallic glasses, Magnetic properties, Mechanical characterization.

Submitted at: Sept. 5, 2006
Accepted at: Sept. 13, 2006

Citation

M. STOICA, J. ECKERT, S. ROTH, L. SCHULTZ, A. R. YAVARI, Preparation and characterization of Fe-(Cr,Mo,Ga) (P,C,B) soft magnetic bulk metallic glasses, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 5, pp. 1685-1690 (2006)