Results 11 to 20 of about 3,253,810 (284)

Strain gradients and geometrically necessary dislocations in deformed ice single crystals

Scripta Materialia, 2003
Abstract Hard X-ray diffraction experiments were performed on ice single crystals deformed in torsion. This work shows the relationship between the density of geometrically necessary dislocations and strain gradients. The torsion strain appears to be totally accommodated by geometrically necessary basal screw dislocations.
Montagnat, Maurine, Duval, Paul, Bastie, Pierre, Hamelin, Bernard   +3 more
openaire   +2 more sources

Size-dependent geometrically necessary dislocation structures in single-crystalline tungsten [PDF]

Journal of Materials Research, 2022
Abstract Wedge indentation experiments were conducted to study the depth dependence of geometrically necessary dislocation (GND) structures in single-crystalline tungsten. Single-crystalline tungsten exhibits a pronounced indentation size effect (ISE), which can be rationalized based on GNDs. The dislocation mechanisms,
Jin Wang, Likang Luan, Tillmann Volz, Sabine M. Weygand, Ruth Schwaiger   +4 more
openaire   +6 more sources

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

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

Strain-gradient effect on the crack tip dislocations density

Fracture and Structural Integrity, 2020
In this study, the influence of a material’s plastic properties on the crack tip fields and dislocation density behavior is analytically and numerically analyzed using the conventional mechanism-based strain-gradient plasticity (CMSGP) theory established
Valery Shlyannikov, Andrey Tumanov, Ruslan Khamidullin   +2 more
doaj   +3 more sources

Large-scale fabrication method of heterostructured materials using conventional cold-rolling for industrial applications

Journal of Materials Research and Technology, 2023
Heterostructured materials offer great promise as next-generation structural materials, providing excellent combinations of strength and elongation. However, the need for additional equipment for heterostructuring poses challenges for scalability.
Gang Hee Gu, Yongju Kim, Hyeonseok Kwon, Rae Eon Kim, Jungwan Lee, Hyoung Seop Kim   +5 more
doaj   +1 more source

The role of geometrically necessary dislocations in giving material strengthening [PDF]

Scripta Materialia, 2003
The role of geometrically necessary dislocations in providing macroscopic strengthening is reviewed with particle reinforcement as an examp le. The general relation between the Nye tensor and slipalong a curvilinear slipline net is derived to emphasise the importance of curvature of slip lines upon the rate of dislocation storage.
N.A Fleck, M.F Ashby, J.W Hutchinson
openaire   +1 more source

Three-Dimensional Structures of the Geometrically Necessary Dislocations Generated from Non-Uniformities in Metal Microstructures [PDF]

, 2004
Slip deformation in microstructures of f.c.c. type metals are analyzed by a finite element technique and the density distribution of the geometrically necessary dislocations is evaluated. Results show development of wall like structure of dislocations in
Tetsuya Ohashi, Ohashi, Tetsuya
core   +2 more sources