期刊
ACTA MATERIALIA
卷 57, 期 16, 页码 4639-4648出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.06.013
关键词
Metallic glasses; Shear band velocity; Plastic deformation; Compression test
资金
- National Science Foundation [DMR-0705517]
We have made measurements of the temporal and spatial features of the evolution of strain during the serrated flow of Pd40Ni40P20 bulk metallic glass tested under quasistatic, room temperature, uniaxial compression. Strain and load data were acquired at rates of up to 400 kHz using strain gages affixed to all four sides of the specimen and a piezoelectric load cell located near the specimen. Calculation of the displacement rate requires an assumption about the nature of the shear displacement. If one assumes that the entire shear plane displaces simultaneously, the displacement rate is approximately 0.002 in s(-1). If instead one assumes that the displacement occurs as a localized propagating front, the velocity of the front is approximately 2.8 in s(-1). In either case, the velocity is orders of magnitude less than the shear wave speed (similar to 2000 in s(-1)). The significance of these measurements for estimates of heating in shear bands is discussed. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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