Results 1 to 10 of about 9,231 (286)

Diffuse-interface polycrystal plasticity: expressing grain boundaries as geometrically necessary dislocations [PDF]

Materials Theory, 2017
The standard way of modeling plasticity in polycrystals is by using the crystal plasticity model for single crystals in each grain, and imposing suitable traction and slip boundary conditions across grain boundaries.
Nikhil Chandra Admal, Giacomo Po, Jaime Marian   +2 more
doaj   +4 more sources

Microhardness model based on geometrically necessary dislocations for heterogeneous material

Journal of Materials Research and Technology, 2021
Lamellar cast irons are known as heterogeneous materials. Their overall hardness is determined by the microhardness of their microstructure contents.
Mohammed Mendas, Stéphane Benayoun, Mohamed Hadj Miloud, Ibrahim Zidane   +3 more
doaj   +2 more sources

Trigonometric gradient microstructures in additively manufactured single crystals enable strength-ductility synergy and programmable performance [PDF]

Nature Communications
Additively manufactured (AM) single crystals (SXs) show great promise for extreme-environment applications. AM process enhances gradient microstructures around dendrites, including dislocation densities, matrix channel width, precipitate area, and ...
Zixu Guo, Yang Li, Lei Fan, Shiwei Wu, Daijun Hu, Guochen Peng, Feng Lin, Yong-Wei Zhang, Yilun Xu, Wentao Yan   +9 more
doaj   +2 more sources

Crystal Orientation and Dislocation Slip

Metals, 2023
It is a widely held belief that dislocation slip has a direct effect on crystal orientation. Some of the confusion may be attributed to semantics when researchers are referring to related effects of dislocations on crystal orientation; either elastic ...
Malcolm Griffiths
doaj   +1 more source

Dislocation behavior and strengthening mechanisms of Cu–Te alloy drawn at room and cryogenic temperatures

Journal of Materials Research and Technology, 2023
In the work, the cryogenic and room temperature drawing behaviors of Cu–Te alloy with a wide range of accumulative drawing true strain up to 1.1 are systematically investigated. For the first time, the storage of geometrically necessary dislocations (GND)
Qianqian Fu, Bing Li, Hongwang Fu, Minqiang Gao, Changfeng Wang, Ying Fu, Renguo Guan   +6 more
doaj   +1 more source

A numerical study of reversible plasticity using continuum dislocation mechanics

Comptes Rendus. Physique, 2021
In this contribution, an elasto-viscoplastic fast Fourier transform-based (EVPFFT) numerical implementation of the Mesoscale Field Dislocation Mechanics (MFDM) formulation, called MFDM-EVPFFT, is applied to study the reversible plastic behavior of ...
Berbenni, Stéphane, Lebensohn, Ricardo A.   +1 more
doaj   +1 more source

Modeling of extra strengthening in gradient nanotwinned metals based on molecular dynamics

Frontiers in Materials, 2022
Gradient nanotwinned metals exhibit extra strengthening and work hardening behaviors, which have enormous potential for engineering applications. In this study, molecular dynamics method is performed for analyzing the effects of nanotwinned structure ...
Zailin Yang, Zailin Yang, Xiaoyang Ding, Yong Yang, Yong Yang, Minghe Li, Shihao Cao   +6 more
doaj   +1 more source

Synergetic-Deformation-Induced Strengthening in Gradient Nano-Grained Metals: A 3D Discrete Dislocation Dynamics Study

Metals, 2022
Gradient nano-grained (GNG) metals have shown high synergetic strength and good ductility due to their unique gradient microstructure. In this study, the mechanical behavior of gradient nano-grained metals was investigated by three-dimensional discrete ...
Songjiang Lu, Qianhua Kan, Bo Zhang, Chao Yu, Xu Zhang   +4 more
doaj   +1 more source

Discrete dislocation simulations and size dependent hardening in single slip [PDF]

, 1998
Plastic deformation in two-dimensional monophase and composite materials is studied using a discrete dislocation dynamics method. In this method, dislocations are represented by line defects in a linear elastic medium, and their interactions with ...
Cleveringa, H.,, Giessen, E. van der,, Needleman, A.,   +2 more
core   +7 more sources

Simultaneous strength-ductility enhancement in as-cast Ti6Al4V alloy by trace Ce

Materials & Design, 2022
Impurity elements always play a major role in hindering mechanical property improvement in Ti6Al4V, and specifically most of them e.g. O, P, Cl, and S dissolved in the matrix deteriorate the mechanical properties of Ti6Al4V. This work presents a strategy
K.M. Li, Y.J. Liu, X.C. Liu, X. Wu, S.F. Zhou, L.C. Zhang, W. Li, W.C. Zhang   +7 more
doaj   +1 more source