Abstract High manganese steels are well used for their excellent hardening properties. In this study, we investigate the mechanical responses of high steel in a compressed condition. During compression deformation, twin crystal is first generated inside some grains with orientation advantage, and then all twinned. Selective twinning on leads to formation textural structures. When plastic deform...

The deformation of metallic glasses involves two competing processes: a disordering process involving dilatation, free volume accumulation, and softening, and a relaxation process involving diffusional ordering and densification. For metallic glasses at room temperature and under uniaxial loading, disordering usually dominates, and the glass can fail catastrophically as the softening process ru...

It is usually assumed that ‘fire hardening’ the tips of spears, as practised by hunter–gatherers and early Homo spp., makes them harder and better suited for hunting. This suggestion was tested by subjecting coppiced poles of hazel to a fire-hardening process and comparing their mechanical properties to those of naturally seasoned poles. A Shore D hardness test showed that fire treatment slight...

High-attenuation object-induced streaking and shadow artifacts in computerized tomography (CT) are somewhat connected to the misfit of the X-ray projection data to the range space of the Radon transform. This misfit is mainly due to the beam hardening factor of the projection data which is unavoidable for polychromatic sources. The major difficulty in dealing with the beam hardening-induced str...

We have developed a mechanism-based plasticity model of nanotwinned metals to investigate the effect of twin spacing on strength, ductility and work hardening rate of such materials. In particular, the unique roles of dislocation pile-up zones near twin and grain boundaries, as well as twinning partial dislocations, in strengthening and work hardening are incorporated in the model. Competition ...

The stress distribution in torsionally deformed cylindrical polycrystalline copper samples was investigated. The strain in torsional deformation changes with distance from the torsional axis and thus the local extent of work hardening and consequently the local flow stress changes as well. The variation of the flow stress with radial position in the samples was measured by microhardness tests. ...