Results 41 to 50 of about 52,903 (306)

A minimal gradient-enhancement of the classical continuum theory of crystal plasticity. Part II: Size effects

Archives of Mechanics, 2016
In our previous paper, a simple gradient-enhancement of the classical continuum theory of plasticity of single crystals deformed by multislip has been proposed for incorporating size effects. A single internal length scale has been derived as an explicit
S. Stupkiewicz, H. Petryk
doaj   +1 more source

Microstructural Evolution and Vacancy Defect Formation in Mn–Mo–Ni RPV Steel Under Low Cycle Fatigue: Insights From EBSD and PALS

Advanced Engineering Materials, EarlyView.
Low‐cycle fatigue damage in Mn–Mo–Ni reactor pressure vessel steel is examined using a combined electron backscatter diffraction and positron annihilation lifetime spectroscopy approach. The study correlates texture evolution, dislocation substructure development, and vacancy‐type defect formation across uniform, necked, and fracture regions, providing
Apu Sarkar, Dhanadeep Dutta, G. Bharat Reddy   +2 more
wiley   +1 more source

In-situ observation of dislocation dynamics near heterostructured interfaces

Materials Research Letters, 2019
There has been a long-standing controversy on how dislocations interact with interfaces. Here we report in-situ observations that in a Cu–brass heterostructured TEM film Frank–Read sources are the primary dislocation sources. They were dynamically formed
Hao Zhou, Chongxiang Huang, Xuechao Sha, Lirong Xiao, Xiaolong Ma, Heinz Werner Höppel, Mathias Göken, Xiaolei Wu, Kei Ameyama, Xiaodong Han, Yuntian Zhu   +10 more
doaj   +1 more source

Dislocation microstructures and strain-gradient plasticity with one active slip plane

, 2015
We study dislocation networks in the plane using the vectorial phase-field model introduced by Ortiz and coworkers, in the limit of small lattice spacing.
Conti, Sergio, Garroni, Adriana, Müller, Stefan   +2 more
core   +1 more source

Deformation compatibility in a single crystalline Ni superalloy [PDF]

, 2015
Deformation in materials is often complex and requires rigorous understanding to predict engineering component lifetime. Experimental understanding of deformation requires utilization of advanced characterization techniques, such as high spatial ...
Britton, T, Dunne, F, Jiang, J, Zhang, T
core   +2 more sources

Quantum Emitters in Hexagonal Boron Nitride: Principles, Engineering and Applications

Advanced Functional Materials, EarlyView.
Quantum emitters in hexagonal boron nitride have emerged as a promising candidate for quantum information science. This review examines the fundamentals of these quantum emitters, including their level structures, defect engineering, and their possible chemical structures.
Thi Ngoc Anh Mai, Md Shakhawath Hossain, Nhat Minh Nguyen, Yongliang Chen, Chaohao Chen, Xiaoxue Xu, Quang Thang Trinh, Toan Dinh, Toan Trong Tran   +8 more
wiley   +1 more source

Slip system level strengthening in nano-indentation of single crystalline copper: Numerical study via a non-local CPFEM model [PDF]

MATEC Web of Conferences
A three-dimensional non-local crystal plasticity finite element model (CPFEM) integrating the evolution of geometrically necessary dislocations (GNDs) and statistically stored dislocations (SSDs) was developed to simulate the nano-indentation of single ...
Zhu Shuai, Brousseau Emmanuel
doaj   +1 more source

Defects in Crystalline Packings of Twisted Filament Bundles: II. Dislocations and Grain Boundaries

, 2011
Twisted and rope-like assemblies of filamentous molecules are common and vital structural elements in cells and tissue of living organisms. We study the intrinsic frustration occurring in these materials between the two-dimensional organization of ...
Amir Azadi, D. R. Nelson, F. R. N. Nabarro, Gregory M. Grason, J. P. Hirth, J.-F. Sadoc, L. D. Landau, P. G. de Gennes, T. Aste, T. J. Wess   +9 more
core   +1 more source

Geometrically necessary dislocations and strain-gradient plasticity: a few critical issues [PDF]

Scripta Materialia, 2003
Abstract A few issues related to the modeling of size effects in terms of geometrically necessary dislocations (GNDs) are critically discussed, viz. strain hardening, length scale dependence, types of GND arrays. Consequences are drawn regarding the continuum modeling of size effects in plasticity.
L.P Kubin, A Mortensen
openaire   +1 more source

Atomic Size Misfit for Electrocatalytic Small Molecule Activation

Advanced Functional Materials, EarlyView.
This review explores the application and mechanisms of atomic size misfit in catalysis for small molecule activation, focusing on how structural defects and electronic properties can effectively lower the energy barriers of chemical bonds in molecules like H2O, CO2, and N2.
Ping Hong, Changfan Xu, Huaping Zhao, Yong Lei   +3 more
wiley   +1 more source