Results 21 to 30 of about 10,703 (292)

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

Electropulsing treatment-induced the enhanced recrystallization of deformed Al0.1CoCrFeNi high-entropy alloy at lower temperature

Journal of Materials Research and Technology, 2023
It is urgent to explore an efficient treatment strategy to obtain characteristic microstructures for better mechanical properties of alloys in an era of energy shortage.
Yafei Wang, Weichao Wu, Fei Cui, Xiaojun Yang   +3 more
doaj   +1 more source

Study of size effects in thin films by means of a crystal plasticity theory based on DiFT [PDF]

, 2007
In a recent publication, we derived the mesoscale continuum theory of plasticity for multiple-slip systems of parallel edge dislocations, motivated by the statistical-based nonlocal continuum crystal plasticity theory for single-glide due to Yefimov et ...
Limkumnerd, Surachate, Van der Giessen, Erik   +1 more
core   +3 more sources

Formation of grains and dislocation structure of geometrically necessary boundaries [PDF]

Materials Science and Engineering: A, 2015
A continuum dislocation model of formation of grains whose boundaries have a non-vanishing thickness is proposed. For a single crystal deforming in simple shear the lamellar structure of grains with thin layers containing dislocations as the geometrically necessary boundaries turns out to be energetically preferable.
Koster, Michael, Le, Khanh Chau
openaire   +2 more sources

New insights on dislocation forming mechanism of nickel-based superalloy fabricated by laser powder bed fusion

Journal of Materials Research and Technology
In this work, the forming mechanism of dislocation in laser powder bed fusion (LPBF) built IN738LC alloy was elucidated by studying the intrinsic relationships between the density and distribution of dislocation and the orientation and size of dendrite ...
Mingchuan Li, Rui Ma, Yiqun Ren, Shuai Chang, Liqun Li   +4 more
doaj   +1 more source

Size effects and idealized dislocation microstructure at small scales: predictions of a phenomenological model of Mesoscopic Field Dislocation Mechanics: Part I

, 2005
A Phenomenological Mesoscopic Field Dislocation Mechanics (PMFDM) model is developed, extending continuum plasticity theory for studying initial-boundary value problems of small-scale plasticity.
Acharya, Amit, Roy, Anish
core   +1 more source

Investigation of the mechanism of the indentation size effect for titanium

Mechanical Engineering Journal, 2019
In this study, we investigated the mechanism of the indentation size effect for Ti, whose crystal structure is hexagonal close-packed. Indentation tests were performed for two types of single-crystal Ti with different crystal orientations: (0001) and ...
Shota HASUNUMA, Hirohisa MIYAZAKI, Takeshi OGAWA   +2 more
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

Gradients of Strain to Increase Strength and Ductility of Magnesium Alloys

Metals, 2019
A strain gradient was produced in an AZ31B magnesium alloy through a plastic deformation of pure torsion at a torsional speed of π/2 per second. Compared with the base material and with the alloy processed by conventional severe plastic deformation,
Yao Liu, Songlin Cai
doaj   +1 more source

Particle interspacing effects on the mechanical behavior of a Fe–TiB2 metal matrix composite using FFT-based mesoscopic field dislocation mechanics

Advanced Modeling and Simulation in Engineering Sciences, 2020
This paper presents an application to metal matrix composites (MMCs) of an enhanced elasto-viscoplastic Fast Fourier Transform (EVP-FFT) formulation coupled with a phenomenological continuum Mesoscale Field Dislocation Mechanics (MFDM) theory.
J. Genée, S. Berbenni, N. Gey, R. A. Lebensohn, F. Bonnet   +4 more
doaj   +1 more source