Article
Chemistry, Physical
Waygen Thor, Hei-Yui Kai, Yonghong Zhang, Ka-Leung Wong, Peter A. Tanner
Summary: The effect of temperature on the luminescence lifetime and intensity of lanthanide complexes in toluene solution was studied, revealing different behaviors among various lanthanide elements at different temperatures.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Waygen Thor, Hei-Yui Kai, Yonghong Zhang, Ka-Leung Wong, Peter A. Tanner
Summary: This study investigates the effect of temperature on the lanthanide luminescence lifetime and intensity in toluene solution for various complexes. An unusual behavior was observed for some lanthanide systems, challenging the typically assumed relationship between lifetime and intensity.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Multidisciplinary Sciences
Xiang Wang, Sixue Zheng, Shuhei Shinzato, Zhengwu Fang, Yang He, Li Zhong, Chongmin Wang, Shigenobu Ogata, Scott X. Mao
Summary: As the sample size decreases to the nanoscale, surface-related mechanisms become crucial in the deformation of nanoscale crystals, including diffusion-induced nucleation behaviors and the potential for mass transport facilitated by the ultrahigh surface-to-volume ratio.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Industrial
Lingxiao Li, Qiuyue Du, Yuhao Wang, Kai Xu, Minghan Sun, Jingna Sun, Fengshan Du
Summary: This study investigated the behavior of hydrogen in steel during thermoplastic deformation and its impact on material properties. The results showed that hydrogen slightly increased the flow stress and samples with higher hydrogen content had higher dislocation density. Hydrogen reduced the driving force of defect recovery, making recovery more difficult and leading to an increase in dislocation density and flow stress. Improving the alloy processing method may be an effective way to inhibit hydrogen embrittlement.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Geological
Jibril B. Coulibaly, Alessandro F. Rotta Loria
Summary: This paper presents a theoretical and computational investigation of the transient dynamics characterizing the thermally induced deformation of sands under oedometric conditions. The study shows that the heating rates and the materials used can greatly affect the response of sands to thermal loads.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Chemistry, Physical
Jungwan Lee, Jongun Moon, Jae Wung Bae, Jeong Min Park, Hyeonseok Kwon, Hidemi Kato, Hyoung Seop Kim
Summary: This study investigated the quasi-static tensile properties of Fe60Co15Ni15Cr10 ferrous medium-entropy alloy at 298 K and 77 K in terms of thermally-activated deformation mechanism. The alloy showed relatively high strain rate sensitivity and low activation volume at 77 K, where deformation-induced martensitic transformation occurred. Different rate-controlling mechanisms were identified at both temperatures for early and latter deformation, with dislocation behaviors supporting the outstanding cryogenic tensile properties of the alloy.
Article
Nanoscience & Nanotechnology
Zhuocheng Xie, Dimitri Chauraud, Achraf Atila, Erik Bitzek, Sandra Korte-Kerzel, Julien Guenole
Summary: Synchro-Shockley dislocations, as zonal dislocation, play a crucial role in the plasticity of Laves phases at high temperatures. The motion of these dislocations involves localized transition events, and their activation volumes contribute to the temperature and strain rate sensitivity of the Peierls stress. However, the thermally activated behavior of synchro-Shockley dislocation motion is not well understood. This study investigates the transition mechanisms of these dislocations at different shear and normal strain levels, and reveals that the motion of synchro-Shockley dislocations is sensitive to shear, but requires thermal assistance for shear-insensitive events, indicating their inhibition at low temperatures.
SCRIPTA MATERIALIA
(2023)
Article
Physics, Multidisciplinary
Sebastien Merkel, Sovanndara Hok, Cynthia Bolme, Dylan Rittman, Kyle James Ramos, Benjamin Morrow, Hae Ja Lee, Bob Nagler, Eric Galtier, Eduardo Granados, Akel Hashim, Wendy L. Mao, Arianna E. Gleason
Summary: Through ultrafast experiments, the plasticity behavior of hexagonal-close-packed iron under extreme loading states was studied. The results show that {101 over bar 2} deformation twinning controls the microstructures of polycrystalline iron at high strain rates and occurs within 1 ns.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Fluids & Plasmas
Marko Popovic, Tom W. J. de Geus, Wencheng Ji, Matthieu Wyart
Summary: The study investigates the thermal flow of amorphous solids under stress, revealing thermally activated flow at low temperature and proposing a general law describing the rounding of the transition, which holds true in various models and simulations.
Article
Nanoscience & Nanotechnology
W. X. Zhao, S. H. Jiang, W. H. Liu, X. Y. Peng, H. Wang, Y. Wu, X. J. Liu, Z. P. Lu
Summary: This study reports a method to achieve massive NbC nanoprecipitation in an aluminum-forming stainless steel through microalloying and pre-straining. The generation of dislocations through pre-straining provides high-density nucleation sites for secondary NbC, while the addition of titanium atoms reduces the nucleation energy barrier. Experimental results show that with 0.1 wt% titanium microalloying and 10% pre-straining, massive precipitation of refined secondary (Ti,Nb)C nanosized particles can be achieved, significantly enhancing the creep resistance of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Jian Liu, Yali He, Yaowu Hu
Summary: As metal forming processes continue to develop, understanding the nano-deformation behavior of metals is crucial for optimizing manufacturing processes and controlling the properties of nano-materials. Unfortunately, the effect of temperature on the deformation behavior of nano-metals under high strain rates remains largely unexplored. This study demonstrates the nonlinear effect of temperature on the formability of nano-metals.
NANOSCALE HORIZONS
(2023)
Article
Nanoscience & Nanotechnology
Jinxu Liu, Huibin Wu, Jinshan He, Shanwu Yang, Chao Ding
Summary: The effect of kappa-carbides on the mechanical properties and superparamagnetism of lightweight steels was investigated. It was found that 1.7C steel has more and larger kappa-carbides, resulting in higher strength. Additionally, the strain hardening rate of 1.7C steel is higher and it does not exhibit yield phenomena. After solution treatment, the strength of both steels decreased but the elongation increased.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Multidisciplinary Sciences
Yifan Wang, Wei Cai
Summary: This study reveals the microscopic mechanisms of cross-slip of screw dislocations in crystalline solids using molecular dynamics simulation and identifies the influence of anharmonic effects. This finding contributes to a better understanding of stress-driven thermally activated processes in solids.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Materials Science, Multidisciplinary
Zhenjun Hong, Binggang Liu, Xiaoshuai Jia, Yu Li
Summary: The microstructure evolution and damage mechanisms of nanostructured bainitic steels under cyclic high-energy impact have been studied. The characterization results show the formation of stress layer, deformation zone, and transition zone based on the gradual increase in retained austenite volume fraction. The presence of transformed martensite and high strain in the deformation zone leads to the nucleation of fatigue cracks and macroscopic microstructure failure.
Review
Materials Science, Multidisciplinary
Seiji Miyashita, Masamichi Nishino, Yuta Toga, Taichi Hinokihara, Ismail Enes Uysal, Takashi Miyake, Hisazumi Akai, Satoshi Hirosawa, Akimasa Sakuma
Summary: This article focuses on the thermal properties of Nd2Fe14B magnet and methods of studying them, covering various thermodynamic properties and coercivity, as well as the effects of dipole-dipole interaction in large grains. The study also includes the analysis of surface nucleation and the distribution of properties of grains from the viewpoint of first-order reversal curve.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Ghiath Monnet
Article
Engineering, Mechanical
P. Franciosi, L. T. Le, G. Monnet, C. Kahloun, M. -H. Chavanne
INTERNATIONAL JOURNAL OF PLASTICITY
(2015)
Article
Materials Science, Multidisciplinary
Jean-Baptiste Baudouin, Akiyoshi Nomoto, Michel Perez, Ghiath Monnet, Christophe Domain
JOURNAL OF NUCLEAR MATERIALS
(2015)
Article
Nanoscience & Nanotechnology
Ghiath Monnet
SCRIPTA MATERIALIA
(2015)
Article
Engineering, Mechanical
C. Kahloun, G. Monnet, S. Queyreau, L. T. Le, P. Franciosi
INTERNATIONAL JOURNAL OF PLASTICITY
(2016)
Review
Materials Science, Multidisciplinary
Ghiath Monnet
JOURNAL OF NUCLEAR MATERIALS
(2018)
Article
Engineering, Mechanical
H. A. Khater, G. Monnet, D. Terentyev, A. Serra
INTERNATIONAL JOURNAL OF PLASTICITY
(2014)
Article
Engineering, Mechanical
Maoyuan Jiang, Benoit Devincre, Ghiath Monnet
INTERNATIONAL JOURNAL OF PLASTICITY
(2019)
Article
Materials Science, Multidisciplinary
D. Terentyev, G. Bonny, C. Domain, G. Monnet, L. Malerba
JOURNAL OF NUCLEAR MATERIALS
(2013)
Article
Materials Science, Multidisciplinary
Jean-Baptiste Baudouin, Ghiath Monnet, Michel Perez, Christophe Domain, Akiyoshi Nomoto
Article
Materials Science, Multidisciplinary
Ghiath Monnet, Manuel A. Pouchon
Article
Materials Science, Multidisciplinary
Ghiath Monnet, Ludovic Vincent, Lionel Gelebart
JOURNAL OF NUCLEAR MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
R. Badyka, G. Monnet, S. Saillet, C. Domain, C. Pareige
JOURNAL OF NUCLEAR MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
M. Pascuet, G. Monnet, G. Bonny, E. Martinez, J. J. H. Lim, M. G. Burke, L. Malerba
JOURNAL OF NUCLEAR MATERIALS
(2019)
Proceedings Paper
Nuclear Science & Technology
Ghiath Monnet
MINOS 2ND INTERNATIONAL WORKSHOP, IRRADIATION OF NUCLEAR MATERIALS: FLUX AND DOSE EFFECTS
(2016)
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.
