期刊
PHILOSOPHICAL MAGAZINE
卷 94, 期 24, 页码 2776-2803出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2014.932461
关键词
bulk metallic glasses; plastic deformation; theory
A thermal activation model to describe the plasticity of bulk metallic glasses (Derlet and Maa beta, Phil. Mag. 93 (2013) p.4232) which uses a distribution of barrier energies and some aspects of under-cooled liquid physics is developed further. In particular, a log-normal distribution is now employed to describe the statistics of barrier energies. A high-temperature mean-field description of homogeneous macroplasticity is then developed and is shown to be similar to a thermal activation picture employing a single characteristic activation energy and activation volume. In making this comparison, the activation volume is interpreted as being proportional to the average mean-square-value of the plastic shear strain magnitude within the material. Also, the kinetic fragility at the glass transition temperature is shown to represent the effective number of irreversible structural transformations available at that temperature.
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