Isothermal creep of metallic glasses: A new approach and its experimental verification

Journal Article · Fri Jun 12 00:00:00 EDT 1998 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(98)00049-4· OSTI ID:638307

Khonik, V A; Mikhailov, V A; Sviridov, V V ^[1]; Kosilov, A T ^[2]

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1. State Pedagogical Univ., Voronezh (Russian Federation). Dept. of General Physics
2. State Technical Univ., Voronezh (Russian Federation). Dept. of Metal Physics

An extended version of the theory of structural relaxation in metallic glasses under the action of external stress is presented. The theory explains the structural relaxation as a set of irreversible noncorrelated two-stage elementary shear atomic rearrangements with continuously distributed activation parameters in distinct regions of structure -- relaxation centers. In loaded samples structural relaxation results in an accumulation of plastic deformation in accordance with magnitude and orientation of the applied stress. General equations are obtained for the creep strain rate as a result of the irreversible directed structural relaxation. Specially designed experiments were performed to test the theory. It is shown that the theory gives an adequate interpretation of experimental creep kinetics except for the time interval that covers 10{sup 1}--10{sup 2} s after loading. This initial creep stage is supposed to result from reversible atomic rearrangements in relaxation centers with a symmetrical two-well potential.

• OSTI ID: 638307
• Journal Information: Acta Materialia, Vol. 46, Issue 10; Other Information: PBD: 12 Jun 1998
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CREEP
METALLIC GLASSES
STRESSES
STRESS RELAXATION
KINETICS
STRAIN RATE
PREDICTION EQUATIONS
VERIFICATION