Deformation field evolution and shear banding of an <italic>in-situ</italic> crystal reinforced amorphous alloy composite
Abstract
<p indent="0mm">The strain field and shear band behaviors of an <italic>in</italic>-<italic>situ</italic> crystal reinfored amorphous alloy composite at microscale were experimentally characterized by digital image correlation method. Combined with the finite element analysis, the deformation of the amorphous alloy composite was simulated, and the evolution of stress and strain fields was given out. The role of each phase during the deformation was analysed. The results show that in the macroscopically elastic range, the crystal phase first deformed plastically, then strain concentration formed at the phase interface, and gradually expanded to the surrounding. As the applied strain increased, strain localization occured inside the material. It is found that, the plastic deformation of the composites is accommodated by shear bands, and the presence of crystal phase in the amorphous alloy composite promotes the formation of multiple shear bands. The load of the composite is mainly sustained by the continuous amorphous matrix, and the shear band forms along with a rapid increase of free volume, which leads to a decrease of flow stress and subsequent a reduced loadbearing capacity of the composite.</p>
