Results 131 to 140 of about 87,277 (311)

Molecular Dynamics Simulations of Plastic Deformation in Nanocrystalline Metal and Alloy

, 2007
Nanocrystalline metals have different mechanical properties from conventional grain sized metals. Hardness and yield strength have been found to increase with decreasing grain size in the nanocrystalline regime down to at least 15 nm on the basis of Hall-
Jang, Seonhee
core  

Overall mechanical behavior of nanocrystalline materials accompanied by damage evolution on grain boundaries

, 2014
In the present research, overall mechanical behaviors of the nanocrystalline materials considering the grain boundary damage evolutions are investigated systematically.
Wei YG(魏悦广), Chen, L (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China., Chen L(陈力)   +2 more
core   +1 more source

Molecular Dynamics Study on Influence of P Segregation at BCC Fe Grain Boundary on Tensile Deformation Behavior

Yuanzineng kexue jishu
Grain boundaries are important microstructures in metallic materials, and dislocation nucleation on grain boundaries plays a crucial role in material deformation.
CHEN Mengyao,  HE Xinfu,  MAO Wenlue,  ZHAO Yongpeng,  WANG Shumin,  ZHAO Hongrui
doaj   +1 more source

High‐Temperature Nanoindentation of Metals: Assessing Thermal Drift, Frame Compliance, and Chemical Composition Effects on the Reported Mechanical Properties

Advanced Engineering Materials, EarlyView.
Do not let thermal drift and instrument artifacts deceive high‐temperature nanoindentation results. We compare classical Oliver–Pharr and automatic image recognition analyses across steels and a Ni alloy to quantify these effects. Accounting for artifacts reveals systematic softening with temperature, while Cr and Ni additions boost resistance ...
Velislava Yonkova, Steffen Brinckmann, Ruth Schwaiger   +2 more
wiley   +1 more source

grain boundaries

, 2019
Effects related to alkali metal doping and grain boundaries have puzzled the chalcopyrite photovoltaics community for a long time. This study is the first to report reversible oxidation of grain boundaries in CuInSe 2 thin films.
Nathalie Valle, Jean-Nicolas Audinot, Anastasiya Zelenina, Tom Wirtz, Harvey Guthrey, Damien Aureau, Phillip J. Dale, Nicoleta Nicoara, Diego Colombara, Finn Babbe, Sascha Sadewasser, Deepanjan Sharma, Hossam El Anzeery   +12 more
core   +1 more source

Formation mechanism of multiple spallation and its penetration induced by shear localization in NiTi alloy under implosion loading

Matter and Radiation at Extremes
This study uses nonequilibrium molecular dynamics simulations to explore the dynamic failures and deformation mechanisms of a cylindrical shell composed of nanocrystalline nickel–titanium alloy under implosion loading.
Xianye Wu, Xiaoyang Pei, Xiang Chen, Hao Zhang, Jin Wang, Xin Yang, Meizhen Xiang, Shang Gao, Fang Wang   +8 more
doaj   +1 more source

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

Strengthening effects of various grain boundaries with nano-spacing as barriers of dislocation motion from molecular dynamics simulations

, 2017
Strengthening in metals is traditionally achieved through the controlled creation of various grain boundaries (GBs) such as low-angle GBs high-angle GBs and twin boundaries (TBs).
Yuan, FP (reprint author), Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100190, Peoples R China., 袁福平, Yuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.   +2 more
core   +1 more source

Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying

Advanced Engineering Materials, EarlyView.
An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara, Vincent Rat, Quentin Dubreuil, Patrice Valorge, Simon Goutier, Alain Denoirjean, Olivier Messe, Céline Ruelle, Jean‐Philippe Poli   +8 more
wiley   +1 more source

Ti segregation at CoSi grain boundaries

, 2019
International audienceThe localization of Ti at grain boundaries after the phase formation of CoSi 2 on Si(111) from a Co-Ti bilayer is examined. For the chemical analysis at the atomic scale, atom probe tomography (APT) is applied.
Zschiesche, Hannes, Alfonso, Claude, Mangelinck, Dominique, Charai, Ahmed   +3 more
core   +1 more source