Advanced Study Group Diffusion and Microstructure Analysis (DMA)
Impact of plastic deformation and shear band formation on the boson heat capacity peak of a bulk metallic glass
Y.P. Mitrofanov, M. Peterlechner, S. V. Divinski, G. Wilde.
Physical Review Letters, 112, 135901, (2014)
The effect of annealing on the low-temperature heat capacity of a bulk Pd38.5Ni40P21.5 metallic glass is investigated for as-quenched and deformed (rolled) states. Although the boson heat capacity peak increases with increasing strain, it relaxes faster and to a lower level compared to that of the as-quenched state after annealing treatments both below and above the glass transition temperature Tg. The glass is found to retain a certain “memory” on the room-temperature plastic deformation even after annealing above Tg. Indications for two counteracting processes that might be related to different types of shear bands are observed.