Evolution of Mechanical Properties of Cast Zr<SUB>50</SUB>Cu<SUB>40</SUB>Al<SUB>10</SUB> Glassy Alloys by Structural Relaxation

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  • Yokoyama Yoshihiko
    Advanced Research Center of Metallic Glasses, Institute for Materials Research, Tohoku University
  • Akeno Yasutake
    School of Engineering, University of Hyogo
  • Yamasaki Toru
    School of Engineering, University of Hyogo
  • Liaw Peter K.
    Department of Materials Science and Engineering, The University of Tennessee
  • Buchanan Raymond. A.
    Department of Materials Science and Engineering, The University of Tennessee
  • Inoue Akihisa
    Advanced Research Center of Metallic Glasses, Institute for Materials Research, Tohoku University

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  • Evolution of Mechanical Properties of Cast Zr50Cu40Al10 Glassy Alloys by Structural Relaxation

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Abstract

The volume of a quenched glassy alloy is a variable of cooling rates during the amorphization. Hence a change in the volume caused by the structural relaxation can be regarded as a degree of amorphousness. The density of Zr50Cu40Al10 bulk glassy alloys (BGAs) increases linearly with the annealing temperature below the glass-transition temperature (Tg). With increasing the annealing temperature, the tensile strength and Vickers hardness show constant values, whereas the Young’s moduli and Charpy impact values become larger and smaller, respectively. Especially, Charpy impact values of Zr–Cu–Al BGAs have a linear relationship with the relative value of excessive free volume, which correspond to the volume-change ratio caused by the full structural relaxation.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 46 (12), 2755-2761, 2005

    The Japan Institute of Metals and Materials

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