In order to achieve process stability in the industrial thermoforming of fiber reinforced polymers (FRPs), typically, cost- and time-intensive trial-and-error-processes are required. The experimental boundary conditions, as well as the material composition and component design optimization, are highly dependent on material phenomena related to various material scales and constituents. It is therefore

Additive manufacturing (AM) of high-entropy alloys (HEAs) typically results in the formation of unique microstructures and deformation mechanisms, sparking widespread research interest. This study delves into the deformation behavior and strengthening mechanisms of an AMed HEA with hierarchical heterostructures. The results show that the alloy consists of the FCC matrix, coherent L12 precipitates,

As one of the most important plastic deformation mechanisms of high-entropy alloys, deformation twinning can increase the strength without losing plasticity. Nevertheless, recent studies have shown that high-density twins can form "soft spots" and promote the occurrence of shear localization failure at high strain rates. The extent to which deformation twins contribute to the formation of shear localization

Refractory high-entropy alloys (RHEAs) exhibit excellent anti-irradiation properties, making them promising candidates for application in advanced nuclear reactors. In this study, molecular statics (MS) and molecular dynamics (MD) simulations are conducted to investigate the local unstable stacking fault energy (USFE) in RHEAs induced by primary knock-on atoms (PKAs) of displacement cascades. Based

A new plasticity-induced internal length mean field model (ILMF) is developed, based on statistical analyses of geometrically necessary dislocation (GND) densities and total dislocation densities estimated from EBSD and nanoindentation data, respectively. It is applied to a single phase ferritic Al-killed steel, which plastically deforms with the occurrence of heterogeneous intra-granular fields. During

The limited use of additively manufactured Ti-6Al-4V (AM Ti64) alloy in critical load–bearing applications stems from an incomplete understanding of its fatigue behavior, the underlying causes and mechanisms, and the absence of reliable predictive modeling. This study aims to bridge this gap by attempting to aid a microstructure–sensitive modeling with the number of cycles to failure. Low cycle fatigue

Mechanical constitutive relationships characterize the strain response of materials under external loading, laying the foundation for optimizing material performance and guiding engineering design. However, existing modeling methods for mechanical constitutive relationships, especially for high strain rate (HSR) loading, often rely on fitted experimental data and fail to comprehensively capture the

In recent years, there has been progress in the development of constitutive models for reproducing the mechanical properties of glassy polymers, but there are limitations to conventional models, such as increased complexity and the number of material parameters. In this study, a new model was proposed to describe the nonlinear viscoelastic-viscoplastic behavior under loading, unloading, and cyclic

The cross-scale rheology of amorphous systems raises a number of problems in the fields of materials science and soft condensed matter physics about their fundamental physical principles. Nevertheless, a clear and concise theoretical framework is still lacking to elucidate the process from microscopic plastic events to the coalescence of shear transformation zones, and subsequently from mesoscopic

The accumulation of geometrically necessary dislocations (GND) at grain boundaries is a primary source of long-range internal stress (LRIS) in polycrystals. The distribution of GNDs is typically inhomogeneous, and certain dislocation substructures with concentrated GNDs introduce a strong non-local effect. While many studies have explored the relationship between LRIS and the density of GNDs in polycrystals

The creep behavior of 316 L stainless steel at room temperature was evaluated as a function of time and applied stress using a new high-throughput approach. Several common creep models were evaluated against the observations, leading to deeper analysis of a stress-dependent modified logarithmic creep model. Within this model, multiple sources of uncertainty were compared. Aleatoric stochastic variation

A continuum damage mechanics (CDM) creep model was developed based on the microstructure, which could precisely delineate the evolution of mobile dislocations, dipole dislocations, boundary dislocations, and martensitic laths in the RAFM steel during creep process. The addition of Ta/Zr elements promoted the precipitation of MX carbide particles, which could pin the mobile dislocations, and restrain

This study systematically investigates the deformation mechanism and strengthening effects of the CoCrFeNiMn0.75Cu0.25 high-entropy alloy (HEA) under dynamic tensile loading across a wide temperature range (93 K to 1073 K). The HEA exhibits a ∼30 % enhancement in strength and ductility at 93 K relative to its performance at 298 K. These superior properties result from the synergistic interactions among

This study investigates size effect in nickel-titanium (NiTi) shape memory alloys (SMAs), focusing on their elastic deformation and phase transformation behaviors. A series of experiments, including bulk-scale tension tests, micro-scale tension, compression, and cantilever bending tests, were conducted to observe the effect of specimen dimensions on SMA behavior. Micro-scale tension and compression

We investigate the heterogeneity of the stress state driven by anisotropic deformation response at the single crystal level through five statistical volume element (SVE) calculations of polycrystalline BCC tantalum. This work focuses on grain boundaries as a prominent material defect type prone to void nucleation based upon experimental observations of predominantly intergranular void nucleation in

The pursuit of alloys that integrate high strength and substantial plasticity persists across various industries. Nevertheless, alloys engineered for elevated strength commonly manifest unsustainable work hardening, ultimately leading to a decline in plasticity. Dual- or even multi-phase systems offer vast potential for novel microstructural engineering aimed at harmonizing these inversely related

A study of the partitioning of external power into stress power, stored defect energy, thermal energy, and inertia during dynamic void growth is presented. An alternative form for a classical thick-walled sphere governing equation stemming from a local power balance including energetic cost of free surface creation is proposed. The importance of proper energy accounting in the context of dynamic ductile

This study systematically investigates the effects of different annealing treatments before identical aging on precipitation and mechanical properties of an L12-strengthened Fe-rich medium-entropy alloy (Fe-MEA) fabricated by laser powder bed fusion (L-PBF). These treatments result in distinct final microstructures characterized by either discontinuous precipitation (DP) or continuous precipitation

Shear banding coupled with grain refinement plays a critical role in fracture behavior under dynamic loading and (very) high-cycle fatigue but is rarely observed during low-strain-rate loading. In this study, we report for the first experimental evidence of shear banding mediated fracture mechanism in an electron beam powder bed fusion (EBPBF) fabricated IN738 superalloy upon low-strain-rate (1 × 10−3

Minimal State Cells (MSCs) have successfully overcome the self-consistency and state space issues of standard RNNs when modeling the large deformation response of solids. However, in case of rate- and temperature-dependent materials, MSC-based stress predictions still suffer from instabilities when refining the input path discretization. To resolve this issue, we develop an extended minimal state cell

The intra-granular γ′ phase and inter-granular M23C6 in a polycrystalline Ni3Al-based superalloy are cooperatively controlled through a two-stage-cooling solution treatment. The rapid cooling stage suppresses the coarsening of the γ′ phase, while the subsequent slow cooling stage promotes the precipitation of M23C6. The co-strengthening of intra- and inter-granular particles leads to a longer creep

Texture weakening by dynamic recrystallization (DRX) control has been a challenging issue on improving the mechanical performance of wrought Mg alloys. Here we report the attainment of bi-directional DRX in an AZ31-0.9Nd-0.3Y alloy, which accelerated DRX and weakened the basal texture. The nature and content of secondary phase particles in the solidification microstructures were modified by the mixed-addition

Surface effects were investigated using ultrathin specimens with thicknesses in the order of the grain size of the material. The candidate material was a polycrystalline Ni-based superalloy (Alloy 718) purposely heat treated to document both the effects of the grain size and the metallurgical state, i.e., solid solution and precipitation hardened state, on the polycrystalline-to-multicrystalline behavior

The ratcheting behavior of plastic deformation accumulation under asymmetric loading poses significant risks to the safe service of engineering structures. For accurate prediction of the ratcheting behavior of the material, a physics-informed multimodal network named Dual Stream GRU (DSGRU) model is proposed with training and validation of 316LN stainless steel samples. By incorporating the unrecoverable

A new crystal plasticity finite element (CPFE) approach is developed to predict the mechanical behavior and ductility limits of thin metal sheets. Within this approach, a representative volume element (RVE) is chosen to accurately capture the mechanical characteristics of these metal sheets. This approach uses the periodic homogenization multiscale scheme to ensure the transition between the RVE and

Complex concentrated alloys (CCAs) differ from pure metals and conventional dilute alloys in that the multiple constituent elements are prone to develop special local atomic environments (LAEs). Due to the complexity and spatial variability of the LAEs, the resistance that they offer to travelling dislocations cannot be determined a priori by conventional strengthening theories. In this work, molecular

This research presents a dislocation-based hot deformation model to address a nickel-based superalloy's flow stress response and discontinuous dynamic recrystallization (DDRX) behavior. The developed model can predict the flow curves and subsequent microstructure evolutions during the hot deformation. The evolution of microstructure-reliant internal variables was predicted and validated thoroughly