Results 131 to 140 of about 88,198 (304)

A new dynamic model for study of dislocation pattern formation

, 1996
Based on the principle given in nonlinear diffusion-reaction dynamics, a new dynamic model for dislocation patterning is proposed by introducing a relaxation time to the relation between dislocation density and dislocation flux.
Duan, ZP (reprint author), CHINESE ACAD SCI,LNM,INST MECH,BEIJING 100080,PEOPLES R CHINA., 王文标, 段祝平, Zheng QR, 黄国君, Chen DW   +5 more
core  

A Flux Boundary Condition for Grain Boundary-Dislocation Interaction Using All-Dislocation Density Dynamics (ADD) [PDF]

Grain boundaries (GBs) play a crucial role in the plasticity of polycrystalline materials, yet mesoscopic simulation methods to study their effects remain scarce.
Kalaei, Alireza, Yu, Jinxin, Srolovitz, David J., Ngan, Alfonso H.W., Han, Jian   +4 more
core   +1 more source

Multiscale characterization of dislocation development during cyclic bending under tension in commercially pure titanium

Journal of Materials Research and Technology
Cyclic bending under tension (CBT) has been shown to increase room temperature elongation-to-failure in various sheet metals beyond that of simple tension.
Nathan Miller, Nicholas Pitkin, Talukder Musfika Tasnim Oishi, Desmond Mensah, Marko Knezevic, Michael Miles, David Fullwood   +6 more
doaj   +1 more source

Creep‐Induced Microstructural Evolution in an A2‐B2 Superalloy

Advanced Engineering Materials, EarlyView.
A 27.3Ta‐27.3Mo‐27.3Ti‐8Cr‐10Al (at.%) refractory high‐entropy alloy with precipitation‐strengthened A2‐B2 microstructure was studied by creep tests at 1030°C, which demonstrate a transition in deformation mechanisms in the range of 100–150 MPa applied stress. This is associated with changes in dislocation–precipitate interactions. Relevant deformation
Liu Yang, Aparajita Pramanik, Sandipan Sen, Shubhashis Dixit, Marcel Muench, R. J. Vikram, Daniel Schliephake, Yolita M. Eggeler, Ankur Chauhan, Martin Heilmaier, Alexander Kauffmann   +10 more
wiley   +1 more source

Modeling dislocation density evolution in continuum crystal plasticity [PDF]

, 2001
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.Includes bibliographical references (p. 221-229).Dislocations are the singly most important material defects in crystal plasticity, and although dislocation ...
Arsenlis, Athanasios, 1975-
core  

Creep Properties and Deformation Mechanism of Additively Manufactured NiAl‐CrMo Composites

Advanced Engineering Materials, EarlyView.
Additively manufactured NiAl‐CrMo composites contain numerous interfaces and cell boundaries that control their creep response. At 700°C under high applied stress, creep is dominated by dislocation‐controlled power‐law mechanisms. At 800°C–900°C and lower stresses, creep is primarily diffusion‐controlled along cell boundaries.
Jan Vollhüter, Andreas Bezold, Johan Westraadt, Katharina Fiegl, Subham Chattoraj, Benjamin Wahlmann, Carolin Körner, Michael Mills, Mathias Göken, Steffen Neumeier   +9 more
wiley   +1 more source

Influence of dislocation density on photoluminescence intensity of GaN

, 2005
The influence of dislocation density on photoluminescence intensity is investigated experimentally and compared to a model. GaN samples were grown by molecular beam epitaxy and metal-organic chemical vapour deposition.
Ivanov, Ivan Gueorguiev,, Monemar, Bo,, Liu, Xinju, Andersson, Thorvald, Gurusinghe, MN, Liu, XY, Andersson, TG, Monemar, B., Yao, H.H., Fälth, Fredrik, Wang, SC, Liu, Xinyu, IVanov, I.G., F\ue4lth, Fredrik, Gurusinghe, Manjula, Wang, S.C., Yao, HH, Falth, JF   +17 more
core   +1 more source

Enhanced Strength and Corrosion Resistance of Ti‐13Nb‐12Ta‐10Zr‐4Sn Alloy by Aging Treatment

Advanced Engineering Materials, EarlyView.
This work systematically investigates the effect of aging treatment on mechanical properties and corrosion behavior of vacuum arc‐melted Ti‐13Nb‐12Ta‐10Zr‐4Sn alloy. Owing to the increased α″ martensite, strength and corrosion resistance were significantly enhanced by aging treatment.
Yuhua Li, Rong Zhao, Qian Zhang, Haojie Wang, Yujing Liu, Lai‐Chang Zhang   +5 more
wiley   +1 more source

Direct Metal Deposition of Graphene–Ti28Nb35.4Zr Matrix Composites With Enhanced Mechanical, Corrosion, and Biocompatibility Properties for Bone Implants

Advanced Engineering Materials, EarlyView.
Graphene nanoplatelet (0.1 wt.%) reinforcement significantly enhances the performance of β Ti‐28Nb‐35.4Zr alloy. Grain refinement, reduced water contact angle, and improved surface characteristics promote osteoblast adhesion and complete surface coverage after 7 days.
Khurram Munir, Jixing Lin, Yuncang Li, Li Zhu, Paul F. A. Wright, Cuie Wen   +5 more
wiley   +1 more source

Electron-induced evolution of dislocation density and morphology in Mg-Y-Nd-Gd-Zr alloy at ultra-low temperature

Journal of Magnesium and Alloys
This study elucidates the non-thermal mechanism of dislocation density reduction in a Mg-Y-Nd-Gd-Zr alloy under continuous electropulsing (6.67–15 A/mm²) at ultra-low temperatures (−150 °C to −196 °C) through tripartite characterization and first ...
Chengqian Huang, Zhen Lu, Chao Xu, Xiaojun Wang, Chengcai Zhang, Dekai Liu, Bugang Teng, Lianmei Wu, Fei Li, Manman Yi   +9 more
doaj   +1 more source