Journal of Materials Research

Rapid Communications

Fe-based bulk metallic glasses with diameter thickness larger than one centimeter

V. Ponnambalama1, S. Joseph Poona1 and Gary J. Shifleta2 c1

a1 Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714

a2 Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904-4745

Abstract

Fe–Cr–Mo–(Y,Ln)–C–B bulk metallic glasses (Ln are lanthanides) with maximum diameter thicknesses reaching 12 mm have been obtained by casting. The high glass formability is attained despite a low reduced glass transition temperature of 0.58. The inclusion of Y/Ln is motivated by the idea that elements with large atomic sizes can destabilize the competing crystalline phase, enabling the amorphous phase to be formed. It is found that the role of Y/Ln as a fluxing agent is relatively small in terms of glass formability enhancement. The obtained bulk metallic glasses are non-ferromagnetic and exhibit high elastic moduli of approximately 180–200 GPa and microhardness of approximately 13 GPa.

(Received December 15 2003)

(Accepted February 17 2004)

Key Words:

  • Casting;
  • Metallic glass;
  • Calorimetry

Correspondence:

c1 Address all correspondence to this author. e-mail: sjp9x@virginia.edu

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