日本金属学会誌

J. Japan Inst. Metals, Vol. 51, No. 4 (1987),
pp. 271-277

The Concentration of Anelastic Structural Defects in Metallic Glass and Their Polarization by Creep Deformation

Nobuyuki Morito1, Takeshi Egami2 and Ho So Chen3

1Kawasaki Steel Corporation, New Materials Research Center, Chida
2Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, USA
3AT & T Bell Laboratories, Murray Hill, New Jersey, USA

Abstract:

The effect of annealing and creep deformation on the internal friction of metallic glass wire Pd77.5Cu6Si16.5 was investigated by the inverted torsion pendulum method. It was found that after an extended period of annealing, the glass reaches an internal pseudo-equilibrium state with respect to the internal friction which is a function of the annealing temperature.
Cold rolling of the metallic glass ribbon Fe32Ni36Cr14P12B6 gives no change in the internal friction. And the tensile creep along the wire axis also causes no change in the internal friction of the metallic glass. On the other hand, the torsional creep results in a remarkable increase in the strength of internal friction, and the increased value decreases to the initial level with the recovery of torsional strain by additional annealing. To explain the change in the internal friction with the annealing temperature and tortional creep, a model of anelastic structural defects in the metallic glass is proposed.


(Received 1986/9/16)

Keywords:

metallic glass, internal friction, annealing, tensile creep, torsional creep, anelastic structural defect, paradium-copper-silicon alloy


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