Abstract Effects of reduced (– 40 °C), ambient (20 and elevated (200 °C) deformation temperatures on the microstructure evolution strain hardening behavior two low-C thermomechanically processed high-manganese steels were studied. The was characterized by means scanning electron microscopy (SEM), backscatter diffraction (EBSD), transmission (TEM) techniques. temperature-dependent tendency auste...

Deformation twinning is an important mechanism occurring in certain types of diffusionless shear phase transformations for which the shear processes involve a non-lattice vector. In these cases, the deformation occurs through the nucleation and motion of partial dislocations or the glide of already present partial dislocations, which induce a structural change in the material. The generation an...

This study demonstrates transformation-induced plasticity (TRIP) in conjunction with twinning-induced (TWIP) α + β titanium alloys by introducing metastable retained β-phase. By annealing at 850 °C followed water quenching, β-phase (∼25%) was obtained Ti–6Al–4V alloy. Stress-induced phase transformation the produced orthorhombic α′′-martensite associated (021)α′′ twinning, which significantly i...

A tensile sample of an Al-0.1Mg alloy was in-situ tested in a SEM followed by insitu annealing to develop recrystallizing nuclei/grains. The evolution of microstructure and crystallographic orientations were characterized using the EBSD technique. Changes in the same area within the sample during deformation and annealing steps were closely followed. During the deformation process the original ...

This paper presents a large-scale atomic resolution simulation of nanoindentation into a thin aluminum film using the recently introduced quasicontinuum method. The purpose of the simulation is to study the initial stages of plastic deformation under the action of an indenter. Two different crystallographic orientations of the film and two different indenter geometries (a rectangular prism and ...

Under high-strain-rate compression (strain rate approximately 10(3) s(-1)), nacre (mother-of-pearl) exhibits surprisingly high fracture strength vis-à-vis under quasi-static loading (strain rate 10(-3) s(-1)). Nevertheless, the underlying mechanism responsible for such sharply different behaviors in these two loading modes remains completely unknown. Here we report a new deformation mechanism, ...

Magnesium alloys offer a favored alternative to steels and aluminum alloys due to their low density and relatively high specific strength. Their application potentials are, however, impeded by poor formability at room temperature. In the current work, improved formability for the commercial magnesium AZ80 alloy was attained through the application of the high-rate electro-magnetic forming (EMF)...

Hierarchical composite materials design in biological exoskeletons achieves penetration resistance through a variety of energy-dissipating mechanisms while simultaneously balancing the need for damage localization to avoid compromising the mechanical integrity of the entire structure and to maintain multi-hit capability. Here, we show that the shell of the bivalve Placuna placenta (~99 wt% calc...

Twinning is a critical deformation mode in Mg alloys. Understanding twinning (DT) essential to improving mechanical properties of To address the experimentally observed conspicuous hardening effects Mg-1.8Zn-0.2Ca alloys, interactions between {10–12} twin boundaries (TBs) and solute clusters Mg-Zn-Ca alloys were examined via molecular dynamics (MD) simulations. We find that Zn/Ca-containing sho...