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, , 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

In high-purity polycrystalline metallic materials, voids tend to favor grain boundaries as nucleation sites due to the elevated stress states produced by granular interactions and the weakened grain boundary from the relative atomic disorder. To quantify the key factors of this elevated stress state, simple compression of a small multi-grain cylinder of body-centered cubic tantalum was simulated using

Microcracking is a prevalent and critical issue in additively manufactured tungsten, significantly restricting its safety-critical engineering applications. Till now, most of our current knowledge about microcracking is based on the observation after additive manufacturing (AM) processing, the real-time evolution of microcracking is still largely unexplored, which is challenged by the complex multi-physics

High-strength low-alloy (HSLA) steels demonstrate superior strength and load-bearing capacity compared to traditional plain carbon steel. However, these steels are susceptible to microstructural damage even at intermediate strain rates, which can compromise their performance in automotive application. This research aims to investigate the stress-strain response, internal temperature rise, and damage

In this work, using a mesoscale model, we investigate void growth as mediated by plastic slip at face-centered cubic (FCC)/body centered cubic (BCC) phase boundaries. We employ a large-strain elasto-visco-plastic fast Fourier transform (LS-EVP-FFT) crystal plasticity model with the advantage of treating smooth conformal void surfaces in a crystal. The calculations aim to identify the role of crystallographic

Laser powder bed fusion (L-PBF) induces cellular structures that are considered significant contributors to the enhancement of strength and plasticity. However, after conducting fatigue crack growth (FCG) rate tests on L-PBF fabricated tantalum (LPBF-Ta), we found that cellular structures with specific growth directions can abnormally induce local brittle intergranular cracking, indicating that cellular

To control the curvature of yield loci, a generalized anisotropic distortional hardening ADH (G-ADH) model is established within the framework for Bauschinger effect prediction in ADH2022 (Hu and Yoon, 2022). Any yield criterion can be coupled with G-ADH. The convexity of G-ADH depends on the convexity of the coupled yield criterion. Under the proportional loadings, G-ADH still possesses the characteristics

Recycled Al-Cu alloys deteriorated mechanical properties due to stress concentration caused by coarse Fe-rich intermetallic (Fe-rich phases). This study aims to comparative analysis of processing technology of ultrasonic melt processing (USMP) or/and Al-Ti-B on microstructure and deformation behavior of Al-Cu alloys. They were investigated using various microscopy technique, such as, scanning/transmission

Two-phase nanolaminates are well-renowned for achieving extraordinarily high strengths but at the sacrifice of reduced toughness and strain to failure. Recently ”thick” interfaces, or so called 3D interfaces, in Cu/Nb nanolaminates were experimentally shown to improve both of these mechanical properties. In this work, we study the effect of 3D interfaces in the hexagonal close packed (HCP)/body centered

Primary hot working, represented by multi-directional hot forging and annealing, is a crucial step in microstructure control and plays a decisive role in the ultimate performance of ultra-high strength titanium alloy components. However, the interaction mechanisms of multiple physical processes comprising work hardening, dynamic recovery, dynamic recrystallization and grain fragmentation under complex

High strength and good ductility are essential for the engineering applications of structural materials, yet these two attributes often do not coexist. In the present study, a composite heterostructuring designed with multi-scale, lamellar, and bimodal was developed to deal with the trade-off between strength and ductility. This heterostructuring includes coarse-grain soft domains arranged in a lamellar

This work presents a combined experimental and crystal plasticity finite element modeling study on the development of bulk and local residual strains during tensile and cyclic deformation of an austenitic stainless steel. The (hkl)-specific bulk (residual) lattice strains are measured using X-ray Diffraction, while the local residual strains are measured using High Resolution Electron Back Scatter

Frictional fracture phenomena in geological media are often closely related to fault instability in earthquakes and slip surface formation in geohazards. In this work, we propose a new phase-field model for capturing frictional fractures in pressure-sensitive geomaterials. Our model has three novel features: (i) a thermodynamically consistent energetic interface for contact and friction conditions;

Fractional calculus has been proven to be a powerful modeling tool for soil, which is often used to develop the dilatancy equation in the model construction. However, the existing fractional-order dilatancy equation incorporating the state parameter has the unsatisfying simulations on the dilatancy behaviors of coarse-grained soil, which strongly depends on the material state, i.e., the stress and

In this study, we introduce a novel anisotropic hardening model designed to capture the macroscopic mechanical responses under complex loading paths while considering the mesoscopic evolutions of crystallographic structures. Based on the framework of homogeneous distortional anisotropic hardening, this model treats the plastic shear strain of each slip system as an internal variable. Utilizing the

Twinning, a plastic deformation mode, is crucial in dictating material plasticity and significantly impacting their mechanical properties. In this work, we propose a new twinning mechanism based on the phenomenon of asymmetric shear response. By integrating transition state theory with this mechanism, we derive the twinning nucleation stress, and reveal the impact of temperature and strain rate on

Crystal plasticity finite element (CP-FE) models are now extensively employed to investigate grain-scale deformation in crystalline materials. The fidelity of the model is derived from verification against experimental data; however, it is challenging to quantitatively compare regions of interest across different length scales using various experimental techniques. In this work, we compare CP-FE predictions

The disordered nature of granular materials poses great difficulty to the accurate characterization of microscopic structures. Despite numerous handcrafted structural indicators, the relationship between particle-scale structure and dynamics, as well as the structural origins of complex constitutive behaviors, remain subjects of debate. In this paper, we utilize a Graph Convolutional Neural Network