deformation energy storage and stacking fault energy
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Effect of temperature on the stacking fault energy and …
The intrinsic stacking fault energy shows considerable temperature dependence, thus the deformation processes can be controlled by changing the …
يتعلم أكثرRecrystallization mechanisms and microstructure ...
Some factors such as temperature, extent and complexity of deformation, grain size, melting point and purity of metallic materials, presence of foreign atoms and second phase particles, stacking fault energies and crystallographic texture which affect stored energy of deformation are well known to influence the primary recrystallization …
يتعلم أكثرEffect of temperature on the stacking fault energy and deformation …
1. Introduction. Austenitic stainless steels are widely used in industry due to their excellent corrosion resistance and mechanical properties [1].One of the key parameters often adopted to describe the material''s properties is the stacking fault energy (SFE, or γ isf).Stacking fault energy is an intrinsic parameter which mainly depends on …
يتعلم أكثرExperimental and computational analysis of stacking fault energy …
The average stacking fault energy for the boron-free alloy was 23.9 ± 2.4 mJ/m 2, suggesting that the deformation mechanisms relate to dislocation slip and deformation twinning. The average stacking fault energy for the highest boron content (5.4 at%) was 50.1 ± 14.1 mJ/m 2, indicating dislocation glide as the possible …
يتعلم أكثرInfluence of stacking fault energy on deformation mechanism …
The generation of a high density of twins few tens nanometers in size can enhance both strength and ductility. The present work aims to produce highly twinned microstructure in Cu-6 wt % Zn alloy of a moderate stacking fault energy (SFE) by equal channel angular pressing (ECAP) using a die with angles ϕ = 110° and Ψ = 0.X ray …
يتعلم أكثرDeformation twinning and the role of stacking fault energy …
One crucial parameter influencing the deformation behaviour and mechanical properties of materials is the stacking fault energy (SFE). The SFE plays a pivotal role in determining the likelihood of cross slip and affects the propensity of forming deformation twins and undergoing strain-induced phase transformations.
يتعلم أكثرTemperature-dependent ideal strength and stacking fault energy …
Variations of energy, stress, and magnetic moment of fcc Ni as a response to shear deformation and the associated ideal shear strength (τ IS), intrinsic (γ SF) and unstable (γ US) stacking fault energies have been studied in terms of first-principles calculations under both the alias and affine shear regimes within the {111} slip plane along the and directions.
يتعلم أكثرRevealing the strengthening contribution of stacking faults
The aluminum''s high stacking fault energy (SFE) enhances the ability of cross-slip assisted dislocation motion, resulting in the formation of subgrains or …
يتعلم أكثرAccelerating the prediction of stacking fault energy by combining
Stacking fault energies (SFEs) are key parameters to understand the deformation mechanisms in metals and alloys, and prior knowledge of SFEs from ab initio calculations is crucial for alloy design. Machine learning (ML) algorithms used in the present work show a $ensuremath{sim}$ 80 times acceleration of generalized stacking fault …
يتعلم أكثرInfluence of dislocation–solute atom interactions and stacking fault ...
1. Introduction. Severe plastic deformation (SPD) processes such as high-pressure torsion (HPT) and equal-channel angular pressing (ECAP) are effective for producing ultrafine-grained (UFG) materials [1], [2], [3], [4].For all SPD methods, the grain size decreases with increasing strain at an early stage of straining but enters into a …
يتعلم أكثرDeformation of copper and low stacking-fault energy, …
In rolled low stacking-fault energy alloys the deformation sequence involves the formation of stacking faults, mechanical twins, and shear bands that are at first restricted to individual grains but subsequently extend from one surface to the opposite surface. Shear bands form at ∼35° to the trace of the rolling plane in longitudinal ...
يتعلم أكثرIn-situ investigation of the interaction between hydrogen and stacking ...
1. Introduction. Hydrogen (H) has been proposed as one of the most promising clean energy sources [1, 2].The applications of H-based fuels in industries range from public vehicles, steel production, iron ore reduction to energy supply [2], [3], [4].However, advanced steels (e.g., martensitic steel, transformation-induced plasticity …
يتعلم أكثرFirst-principles studies of intrinsic stacking fault energies and ...
The intrinsic stacking fault (ISF) energy and elastic property are the crucial physical quantities to help our understanding in mechanical behaviors of materials [[7], [8], [9]]. The ISF energy is closely related to the emission, dissolution and motion of dislocations, and hence the mechanical properties of materials [10, 11]. For example, a ...
يتعلم أكثرHeterogeneous precipitation behavior and stacking-fault …
The high flow stress and low stacking fault energy of the dual-heterogeneous-structured MEA promote the formation of high-density stacking faults and nanotwins during deformation from 93 K to 1073 K, and their density increase with decreasing deformation temperature.
يتعلم أكثرStacking fault energy and dynamic recovery: do they impact …
The SFE essentially affects the dynamic recovery processes and thus the materials'' ability to store the energy of plastic deformation. Work hardening rate is expected to decrease (due to dynamic recovery) at the beginning of cross-slip of screw dislocations, as this would relieve the stress concentrations due to pile-up of dislocations.
يتعلم أكثرEffects of stacking fault energy on the deformation behavior of ...
Tailoring stacking fault energy (SFE) is an effective way for enhancing mechanical properties of certain high entropy alloys (HEAs) such as the prototype Cantor …
يتعلم أكثرThe influence of strain rate, deformation temperature and stacking ...
The stacking fault energy (SFE) is the most intrinsic material parameter in determining the microstructural evolution and grain subdivision of deformed metals. Reducing SFE inhibits dislocation activities and promotes deformation twinning, leading to more significant grain refinement and more homogeneous microstructures [15], [16], [17].
يتعلم أكثرThe effect of stacking fault energy on the formation of nano …
In FCC CSS alloys, deformation mechanisms are closely related to stacking fault energy (SFE) [22]. For alloys with high SFE, the deformation generally originates from dislocation movement [23], resulting in low strain hardening capacity.
يتعلم أكثرStacking fault energy in concentrated alloys
Nature Communications - The stacking fault energy is connected to the response of crystals to deformation. Here the authors report a computational study in a …
يتعلم أكثرTowards stacking fault energy engineering in FCC high entropy …
Stacking Fault Energy (SFE) is an intrinsic alloy property that governs much of the plastic deformation mechanisms observed in fcc alloys. While SFE has been recognized for many years as a key intrinsic mechanical property, its inference via experimental observations or prediction using, for example, computationally intensive …
يتعلم أكثرStacking-fault energy
The stacking-fault energy (SFE) is a materials property on a very small scale. It is noted as γ SFE in units of energy per area.. A stacking fault is an interruption of the normal stacking sequence of atomic planes in a close-packed crystal structure.These interruptions carry a certain stacking-fault energy. The width of stacking fault is a consequence of …
يتعلم أكثرEffects of short range ordering on the generalized stacking fault ...
Fig. 2 d–f shows the evolution of the energy difference Δ E hcp-fcc between the HCP and FCC structures of the 3 MPEAs. The respective HCP configurations are formed by changing the stacking sequence of the close-packed {111} planes from ABCABC to ABABAB via slips of the 〈 11 2 ̄ 〉 / 6 Burgers vector. This slip process is …
يتعلم أكثرModeling anisotropic strain hardening and deformation textures …
The differences in the deformation textures, especially in plane-strain compression or rolling deformation, of low and high stacking fault energy (SFE) fcc metals have been the focus of many experimental …
يتعلم أكثرTemperature dependent deformation behavior and stacking fault energy …
As temperature decreases, the stacking-fault energy in many face-centered cubic (fcc) alloys decreases, resulting in a change of deformation mode from dislocation slip to deformation twinning.
يتعلم أكثرRecrystallization mechanisms and microstructure ...
Stacking fault energies influence dislocation mobility and morphology – in high stacking fault energy metals (such as Al) there is ease of dislocation movement by glide, climb and cross slip during plastic deformation, thus less dislocations are accumulated resulting in low stored energy [43]. Low stacking fault energy metals …
يتعلم أكثرEffect of stacking fault energy on hetero-deformation in …
The boundary of these two regions will experience mechanical incompatibility, and the extra storage of GNDs would accommodate this non-uniform deformation. ... Effects of stacking fault energy on deformation induced grain boundary relaxation in nanograined Cu alloys. Acta Materialia, 239 (2022), Article 118256.
يتعلم أكثرStacking fault energies and slip in nanocrystalline metals
In Fig. 2, a GPF energy curve is also shown for a twinning fault, defining the unstable twin fault energy, γ utf, associated with the rigid shift in the presence of a pre-existing stacking fault ...
يتعلم أكثرIn-situ investigation of the interaction between hydrogen and stacking ...
The extension of stacking faults was observed ahead of a pre-prepared notch tip in the H pre-charged sample subjected to a constant bending deformation. For these stacking faults, only one partial dislocation moved within the partial dislocation pair while the other was pinned, possibly due to the interaction with other defects.
يتعلم أكثرThe variation of dislocation density as a function of the stacking ...
The variation of dislocation density with stacking fault energy (SFE) was measured in shock-deformed Cu and Cu–Al alloys. ... the influence of stacking fault energy on the dislocation storage mechanisms, and the propensity for deformation twinning. ... [11]: E d-twin =2TF/d where E d-twin is the energy stored in the deformation twin ...
يتعلم أكثرEffect of stacking fault energy on deformation behavior of cryo …
Fig. 1 shows the engineering stress–strain curve for as-rolled copper and copper alloy. Stacking fault energies of samples and tensile properties are listed in Table 1.Tensile curves show limited uniform elongation (Table 1), and peak immediately after yielding.This suggests that cross-slip or climb of dislocations responsible for dynamic …
يتعلم أكثرFirst-principles calculations of generalized-stacking-fault-energy …
The generalized-stacking-fault-energy (GSFE) curve for pure Cobalt and Co-9 at.%X solid-solution alloys (X = Cr, W, Mo, Ni, Mn, Al, Fe) have been successfully calculated by rigidly shearing an fcc crystal at a (1 1 1) plane along a [1 1 −2] slip direction in two processes using first-principles density-functional-theory (DFT), provide a highly …
يتعلم أكثرMechanical Properties and Stacking Fault Energies of ...
We report in this article our efforts to determine the stacking fault energies of two- to five-component alloys. A range of methods that include ball milling, …
يتعلم أكثرInfluence of stacking fault energy on deformation mechanism …
Partial dislocation emission from grain boundaries in metals with medium-to-high stacking fault energies is observed primarily in the grain size range of a few tens of nanometers. Here we report that a reduction in the stacking fault energy permits the emission of partial dislocations from grain boundaries in ultrafine-grained materials with ...
يتعلم أكثرEffect of Stacking-Fault Energy on the Deformed Structures
Friction wear are accompanied by the formation of refined structures and shear bands in the surface layers of metals and alloys. The propensity for refinement and shear band formation is mainly determined by the stacking-fault energy (SFE). Despite the fact that significant studies have been dedicated to plastic deformation during friction, …
يتعلم أكثرLinking electronic structure calculations to generalized stacking …
The generalized stacking fault energy is a key ingredient to mesoscale models of dislocations. Here we develop an approach to quantify the dependence of …
يتعلم أكثرInfluence of stacking fault energy on deformation mechanism and ...
Here we report that a reduction in the stacking fault energy permits the emission of partial dislocations from grain boundaries in ultrafine-grained materials with …
يتعلم أكثرIntrinsic stacking fault energy and mechanism for deformation …
Molecular dynamics simulations were used to calculate the equilibrium lattice constant and intrinsic stacking fault energy (γ ISF) of binary, ternary, and quaternary Ni-based solid solution alloys formed by substituting Ni atoms in the matrix with Cr, Co, and Al.Molecular dynamics simulations were also used to monitor the compression …
يتعلم أكثرThe variation of dislocation density as a function of the stacking ...
TEM measurements of shock-deformed materials gave an average twin thickness of ∼0.1 μm [22], and the coherent twin boundary energy of a material was taken as half of its stacking fault energy. The area fraction of the deformation twins in the 10 and 35 GPa as-shock-deformed materials was measured from optical metallography and …
يتعلم أكثرOn the stacking fault energy related deformation mechanism of ...
When the external parameters are fixed, the deformation mechanisms of an alloy can be measured using generalized stacking fault energy curve (GSFE), i.e., …
يتعلم أكثرStacking fault energy in concentrated alloys
We revisit the meaning of stacking fault energy (SFE) and the assumptions of equilibrium dissociation of lattice dislocations in concentrated alloys. SFE is a unique value in pure metals.
يتعلم أكثرMechanical behavior and deformation kinetics of ...
Fig. 1 shows the engineering stress-strain curves of Cu-Al samples with varying SFEs processed by SMAT for different treating time. The related data of the tensile properties are given in Table 1.As we can see, the yield strength (YS) σ 0.2 (0.2% offset) and ultimate tensile strength (UTS) σ UTS of the annealed Cu-Al alloys increase with …
يتعلم أكثرEffect of stacking fault energy on deformation behavior of cryo …
According to the results, plastic deformation through shear bands is the dominant mechanism in materials with lower stacking fault energy (CuCrZr) treated under cryogenic conditions. View Show ...
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