The newly developed TMW disk superalloy exhibits better overall mechanical properties in the intended service temperature region (650-750 °C) than the most advanced cast & wrought disk alloy U720Li. Clarification of the underlying mechanisms is beneficial for designing advanced superalloys. Among the TMW alloys, TMW-4M3 has the best tensile strength and creep resistance. In this study, tensile ...

The effects of metastability engineering on tuning deformation behavior and mechanisms in TiZrHfTaX (x = 1.00, 0.80, 0.60, 0.50) refractory body-centered cubic (BCC) high entropy alloys were investigated, with specific emphasis elucidating the underlying interplay between phase stability, mechanical property, twins. It was found that proper thermomechanical treated samples, a variation tantalum...

A mathematical framework is proposed to predict the features of the (5 5 7) lath transformation in low-carbon steels based on energy minimisation. This theory generates a one-parameter family of possible habit plane normals and a selection mechanism then identifies the (5 5 7) normals as those arising from a deformation with small atomic movement and maximal compatibility. While the calculation...

Deformation twins are often observed to meet each other to form multi-fold twins in nanostructured face-centered cubic (fcc) metals. Here we propose two types of mechanism for the nucleation and growth of four different single and multiple twins. These mechanisms provide continuous generation of twinning partials for the growth of the twins after nucleation. A relatively high stress or high str...

Lightweight structural materials are increasingly sought after in the automotive and aerospace industries for their potential to improve fuel efficiency. Magnesium-based metal-matrix composites candidates these kinds of applications. The use recycled carbon fibres offers further energy cost savings. fibre were manufactured by stir casting with high-dispersion shearing, then extruded subsequentl...

Twinning and detwinning behavior of a commercial AZ31 magnesium alloy during cyclic compression–tension deformation with total strain amplitude 4% (±2%) was evaluated using the complementary techniques in-situ neutron diffraction, identical area electron backscatter transmission microscopy. In-situ diffraction demonstrates that compressive dominated by twin nucleation, growth, basal slip, while...

accumulative roll-bonding (arb) is a severe plastic deformation process that is using rolling to produce ultrafine grains in coarse grained metallic materials. in this study, arb has been applied on 70/30 brass up to 6 cycles at ambient temperature and non-lubricated conditions to apply a true strain up to 4.8 von mises strain. microstructures of arbed brass samples were characterized by scanni...

A polycrystalline plasticity model, which incorporates the contribution of deformation twinning, is proposed. For this purpose, each material point treated as a composite consisting parent constituent and multiple twin variants. In constitutive equations, volume fractions their spatial gradients are external state variables to account for boundaries free energy. The set relations implemented in...

In the present work, hydrogen/material interaction with two austenitic steel types, created via a completely different alloying strategy, is investigated. The steels include 304L stainless (ASS) and 18Mn-0.6C twinning-induced plasticity (TWIP) steel. Constant extension rate tensile tests are performed to evaluate influence of hydrogen on deformation fracture mechanisms. A reference condition wi...

Twinning and detwinning behavior, together with slip are studied in a textured AZ31 magnesium alloy under compressive tensile strains along the rolling direction (RD) after each interrupted mechanical test via quasi in-situ electron backscattered diffraction technique. The results show that twinning firstly takes place strain RD. With increasing strain, {101¯2} twins nucleate, then propagate, f...