Results 1 to 10 of about 1,544 (160)

Geometrically Necessary Dislocation Analysis of Deformation Mechanism for Magnesium under Fatigue Loading at 0 °C

Crystals, 2023
This study focused on the analysis of geometrically necessary dislocation (GND) densities for five selected fine-grained magnesium samples. Among the samples, three were tested under different fatigue-loading conditions at 0 °C, one experienced quasi ...
Qizhen Li
doaj   +3 more sources

Length-scale effect due to periodic variation of geometrically necessary dislocation densities

International Journal of Plasticity, 2013
Abstract Strain gradient plasticity theories have been successful in predicting qualitative aspects of the length scale effect, most notably the increase in yield strength and hardness as the size of the deforming volume decreases. However new experimental methodologies enabled by recent developments of high spatial resolution diffraction methods in ...
Christian F. Niordson, Jeffrey W Kysar
exaly   +3 more sources

Graded Brittle–Ductile Transition via Laser-Induced Thermal Gradient for Broaching of Z10C13 Steel [PDF]

Micromachines
This paper presents a breakthrough in activating the skin effect at conventional broaching speeds (1–8 m/min) by using laser defocus gradient modification to induce surface embrittlement in martensitic stainless steel Z10C13.
Guozhen Liu, Zhen Meng, Junqiang Zheng, Weiguang Liu, Xinghua Wu, Jing Ni, Haohan Zhang   +6 more
doaj   +2 more sources

Improving Texture and Microstructure Homogeneity in High-Purity Ta Sheets by Warm Cross Rolling and Annealing

Metals, 2021
The evolution of texture and microstructure uniformity in high-purity tantalum (Ta) sheets during 135° warm cross rolling (WCR) was analyzed in detail.
Doudou Long, Shifeng Liu, Jialin Zhu, Yahui Liu, Shiyuan Zhou, Xiaoli Yuan, Dmytro Orlov   +6 more
doaj   +1 more source

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

Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD

Materials Research, 2021
In this paper, the relationship between Kernel average misorientation (KAM), geometrically necessary dislocation (GND) density and dislocation structures of Nb-bearing austenitic stainless steel under low cycle fatigue (LCF) was studied at 600°C at the ...
Liangwei Fang, Wei Zhao, Yong Wei, Qi Zhang, Liqiang Zhang, Naqash Ali, Hongwei Zhou, Hailian Wei   +7 more
doaj   +1 more source

Geometrically Necessary Dislocations on Plastic Deformation of Polycrystalline TRIP Steel [PDF]

Crystals, 2019
In this study, the main deformation behavior in terms of geometrically necessary dislocations (GND) was investigated on a transformation induced plasticity (TRIP) stainless steel by using sharp indentation at nanometric length scale. Results evidence that austenitic grains display an isotropic behavior on terms of GND, the main deformation mechanism ...
Roa Rovira, Joan Josep, Suárez Vallejo, Sebastian, Guitar, Agustina, Fargas Ribas, Gemma, Mateo García, Antonio Manuel   +4 more
openaire   +4 more sources

Dislocation array reflection enhances strain hardening of a dual-phase heterostructured high-entropy alloy

Materials Research Letters, 2023
Piling-ups of geometrically necessary dislocation (GND) arrays against interfaces are known to produce hetero-deformation induced (HDI) strengthening and strain hardening to enhance the strength and ductility of heterostructured materials. Here we report
Yi Liu, Mengning Xu, Lirong Xiao, Xuefei Chen, Zhaohua Hu, Bo Gao, Ningning Liang, Yuntian Zhu, Yang Cao, Hao Zhou   +9 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

Achieving excellent strength-ductility synergy via high density dislocation and nano-twinning in cryo-rolled FeCoCrNiMo0.2 high-entropy alloy

Journal of Materials Research and Technology, 2023
High-density dislocations and nano-twinning are known to significantly influence the work hardening ability of materials, presenting a potent approach for enhancing their overall strength.
Fei Chen, Fei Liu, Yuan-Biao Tan, Wei Shi, Song Xiang   +4 more
doaj   +1 more source