Results 71 to 80 of about 2,346 (291)

Design of multi-heterogeneous structure and synergistic enhancement of strength-plasticity in Ti-6Al-4V alloy

Materials Research Letters
A multi-heterogeneous microstructure (MHM) composed of large equiaxed α (αeqL), small equiaxed α (αeqS), dispersed α and lamellar α was designed through hot-rolling and aging treatment on bimodal microstructure (BM) in TC4 titanium alloy. The formed αeqS
Honghui Li, Ke Wang
doaj   +1 more source

Accumulation of geometrically necessary dislocations near grain boundaries in deformed copper

, 2012
Cross-correlation-based analysis of electron backscatter diffraction patterns has been used to map the distribution of geometrically necessary dislocation (GND) density in deformed polycrystalline copper.
Jiang, J, Wilkinson, AJ, Britton, TB
core   +1 more source

Molecular Dynamics Studies of Shape Memory Polymers: From Bead–Spring Models to Atomistic Simulations

Advanced Engineering Materials, EarlyView.
Coarse‐grained (left) and atomistic (right) models of the shape memory polymer ESTANE ETE 75DT3 are shown schematically. The two representations bridge molecular detail and mesoscopic description. Both models capture shape memory behavior, linking segmental mobility and conformational relaxation of anisotropic chains to macroscopic recovery, and ...
Fathollah Varnik
wiley   +1 more source

Quantification of grain boundary effects on the geometrically necessary dislocation density evolution and strain hardening of polycrystalline Mg4Al using in situ tensile testing in scanning electron microscope and HR-EBSD

Journal of Magnesium and Alloys
In situ tensile testing in a scanning electron microscope (SEM) in conjunction with high-resolution electron backscatter diffraction (HR-EBSD) under load was used to characterize the evolution of geometrically necessary dislocation (GND) densities at ...
Eunji Song, Mohsen Taheri Andani, Amit Misra   +2 more
doaj   +1 more source

Microstructure Reconstruction in Battery Electrodes Using Machine Learning Based on Low‐Voltage Focused Ion Beam–Scanning Electron Microscopy Tomography Images

Advanced Engineering Materials, EarlyView.
Low‐voltage FIB‐SEM tomography combined with a image preprocessing pipeline improves phase contrast and enables reliable machine‐learning segmentation of conductive networks in lithium‐ion battery electrodes. Structural descriptors are extracted from segmented images, done semimanually and automated, and compared.
Lisa Beran, Vincent Nebel, Dominik Perius, Kshitij Kumar, Yannis Heim, Laura Bies, Tobias Kraus   +6 more
wiley   +1 more source

Plasticity of crystals and interfaces: From discrete dislocations to size-dependent continuum theory [PDF]

Theoretical and Applied Mechanics, 2010
In this communication, we summarize the current advances in size-dependent continuum plasticity of crystals, specifically, the rate-independent (quasistatic) formulation, on the basis of dislocation mechanics.
Mesarovic Sinisa Đ.
doaj   +1 more source

Geometrically necessary dislocation density distributions in Ti–6Al–4V deformed in tension

Acta Materialia, 2011
Abstract We have used cross-correlation-based analysis of electron backscatter diffraction patterns to map lattice rotations in polycrystalline samples of Ti–6Al–4V before and after moderate (6%) tensile deformation. The sensitivity is improved compared to conventional Hough-based indexing and allows the density of geometrically necessary ...
Littlewood, P, Britton, T, Wilkinson, A
openaire   +1 more source

A Dislocation Perspective on Strength and Toughness in Ceramics

Advanced Engineering Materials, EarlyView.
Dislocations in ceramics enjoy a long but yet under‐appreciated history. The three research waves for dislocations in ceramics highlight the topic evolution over the last 90 years. This review focuses on the impact of dislocation on strength and toughness in ceramics.
Xufei Fang
wiley   +1 more source

Hardness-Depth Relationship with Temperature Effect for Single Crystals—A Theoretical Analysis

Crystals, 2020
In this paper, a mechanistic model is developed to address the effect of temperature on the hardness-depth relationship of single crystals. Two fundamental hardening mechanisms are considered in the hardness model, including the temperature dependent ...
Hao Liu, Long Yu, Xiazi Xiao
doaj   +1 more source

Geometrically necessary dislocation density distributions in cyclically deformed Ti–6Al–4V

Acta Materialia, 2012
Abstract Cross-correlation-based electron backscattering diffraction analysis has been used to map lattice rotations in Ti–6Al–4V polycrystals deformed by load-controlled fatigue and dwell fatigue including a hold at maximum load. The lattice curvatures were used to form lower bound estimates of the geometrically necessary dislocation (GND) density ...
Littlewood, P, Wilkinson, A
openaire   +1 more source