Results 11 to 20 of about 1,471 (216)

Plasticity of crystals and interfaces: From discrete dislocations to size-dependent continuum theory [PDF]

Theoretical and Applied Mechanics, 2010
In this communication, we summarize the current advances in size-dependent continuum plasticity of crystals, specifically, the rate-independent (quasistatic) formulation, on the basis of dislocation mechanics.
Mesarovic Sinisa Đ.
doaj   +1 more source

Electropulsing treatment-induced the enhanced recrystallization of deformed Al0.1CoCrFeNi high-entropy alloy at lower temperature

Journal of Materials Research and Technology, 2023
It is urgent to explore an efficient treatment strategy to obtain characteristic microstructures for better mechanical properties of alloys in an era of energy shortage.
Yafei Wang, Weichao Wu, Fei Cui, Xiaojun Yang   +3 more
doaj   +1 more source

New insights on dislocation forming mechanism of nickel-based superalloy fabricated by laser powder bed fusion

Journal of Materials Research and Technology
In this work, the forming mechanism of dislocation in laser powder bed fusion (LPBF) built IN738LC alloy was elucidated by studying the intrinsic relationships between the density and distribution of dislocation and the orientation and size of dendrite ...
Mingchuan Li, Rui Ma, Yiqun Ren, Shuai Chang, Liqun Li   +4 more
doaj   +1 more source

Investigation of the mechanism of the indentation size effect for titanium

Mechanical Engineering Journal, 2019
In this study, we investigated the mechanism of the indentation size effect for Ti, whose crystal structure is hexagonal close-packed. Indentation tests were performed for two types of single-crystal Ti with different crystal orientations: (0001) and ...
Shota HASUNUMA, Hirohisa MIYAZAKI, Takeshi OGAWA   +2 more
doaj   +1 more source

Strain-hardening resilience via the cooperation of geometrically necessary dislocations and deformation twins in a strong and ductile lightweight high-entropy steel

Materials & Design
In the net-zero era, the burgeoning demands within engineering applications require materials that are not only lighter and stronger but also ductile.
Yi-Hsuan Sun, Shi-Wei Chen, Zen-Hao Lai, Shao-Lun Lu, Yi-Ting Lin, Jui-Fan Tu, Hung-Wei Yen   +6 more
doaj   +1 more source

Gradients of Strain to Increase Strength and Ductility of Magnesium Alloys

Metals, 2019
A strain gradient was produced in an AZ31B magnesium alloy through a plastic deformation of pure torsion at a torsional speed of π/2 per second. Compared with the base material and with the alloy processed by conventional severe plastic deformation,
Yao Liu, Songlin Cai
doaj   +1 more source

Particle interspacing effects on the mechanical behavior of a Fe–TiB2 metal matrix composite using FFT-based mesoscopic field dislocation mechanics

Advanced Modeling and Simulation in Engineering Sciences, 2020
This paper presents an application to metal matrix composites (MMCs) of an enhanced elasto-viscoplastic Fast Fourier Transform (EVP-FFT) formulation coupled with a phenomenological continuum Mesoscale Field Dislocation Mechanics (MFDM) theory.
J. Genée, S. Berbenni, N. Gey, R. A. Lebensohn, F. Bonnet   +4 more
doaj   +1 more source

Modeling GND-induced back stress and its role in tension-compression behavior of ultra-thin metal sheets

Materials & Design
Accurate prediction of springback and reverse loading behavior in thin metal sheets requires a constitutive model that captures grain-size-dependent long-range dislocation interactions.
Gyu-Jang Sim, Jehyun You, SeongHwan Choi, Youngjae Kim, Chung An Lee, Hyunki Kim, Donghwan Noh, Myoung-Gyu Lee   +7 more
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

Low‐Angle Grain Boundaries and Re‐Segregation in Single‐Crystalline Ni‐Base Superalloys

Advanced Engineering Materials, EarlyView.
This work demonstrates that Re‐segregation at low‐angle grain boundaries (LAGBs) in Ni‐base superalloys is influenced by misorientation angle. Advanced microscopy and atom probe tomography reveal that higher misorientation angles increases Re‐segregation.
Alireza B. Parsa, Aparna Saksena, Alesander Kostka, Pascal Thome, Felicitas Scholz, Alexandre Mussi, Christoph Somsen, Baptiste Gault, Jan Frenzel, Gunther Eggeler   +9 more
wiley   +1 more source