Article
Nanoscience & Nanotechnology
Yunfei Zheng, Lijuan Xu, Dazhao Chi, Zhenquan Liang, Shiwei Han, Xiang Xue, Shulong Xiao, Jing Tian, Yuyong Chen
Summary: In this paper, the microstructure, tensile properties, and creep behaviors of titanium matrix composites reinforced with different vol% (TiB + TiC) were systematically studied under different temperature conditions. The results showed that the addition of reinforcements improved the mechanical properties of the composites, and the creep mechanism was determined to be dislocation climbing.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Multidisciplinary Sciences
Thomas Breithaupt, Richard F. Katz, Lars N. Hansen, Kathryn M. Kumamoto
Summary: In applications critical to the geological, materials, and engineering sciences, deformation occurs at strain rates too small to be accessed experimentally. Empirical relationships are used to make predictions, but this leads to uncertainties. To address this, a theory of dislocation processes is constructed and validated for olivine deformation. The model explains strain rate, applied stress, and dislocation density relationships, and predicts rapid transient deformation in the upper mantle under Earth conditions.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Physics, Multidisciplinary
Esko Toivonen, Matti Molkkari, Esa Rasanen, Lasse Laurson
Summary: Under the symmetry breaking caused by the direction of the driving force, the roughness of elastic interfaces exhibits asymmetry, which can be quantified by computing the spectrum of local scaling exponents.
PHYSICAL REVIEW LETTERS
(2022)
Article
Mechanics
Mohammad Rahimi, Jalil P. Vafa, Shahriar J. Fariborz
Summary: An analysis is conducted on an isotropic elastic half-plane weakened by a Volterra dislocation, screw/edge. The linear Gurtin-Murdoch surface elasticity theory is employed to incorporate the surface effects. The governing equations are derived in terms of displacement components and solved using the integral transform method. The resulting stress fields exhibit Cauchy and hyper-singular terms near the dislocations. Stress contours and force plots are drawn to visualize the effects of surface on the stress field and behavior of dislocations.
Article
Nanoscience & Nanotechnology
Rolf Sandstrom
Summary: Creep tests at low stresses often do not reach the stationary stage, requiring the use of primary creep models for analysis. A previously published model is reformulated and applied to test data for copper at different temperatures. The data shows that primary creep follows the Φ model, with the creep rate decreasing exponentially with time. Additionally, the data reveals that different stress levels result in different creep mechanisms, with dislocation creep and diffusion creep competing at high temperatures and low stresses.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Biomedical
Babak N. Safa, A. Thomas Read, C. Ross Ethier
Summary: ONH biomechanics plays a central role in glaucoma pathogenesis. By conducting micromechanical testing and finite element modeling on porcine ONH tissue samples, this study provided detailed descriptions of ONH viscoelastic properties and identified a dual mechanism of fluid flow and solid matrix viscoelasticity in the mechanical response of ONH. The obtained properties can be utilized for designing ex vivo test environments and understanding glaucoma pathophysiology.
ACTA BIOMATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Amir R. Khoei, Mehrdad Youzi, G. Tolooei Eshlaghi
Summary: The aim of this study was to investigate the role of temperature, stress, and rhenium (Re) on the gamma/gamma' interfacial misfit dislocation network and mechanical response of Ni-based single crystal superalloys. The results showed that increasing temperature dispersed the atomic potential energy at the interface, diminishing the strength and stability of the networks. Loading resulted in dislocation propagation as the dominant deformation mechanism. Additionally, the study evaluated the effect of Re atoms, finding that they hindered dislocations in the gamma phase. The investigation also revealed that increased temperature led to escalated damage to the interfacial network and the domination of softening mechanisms on deformation.
MECHANICS OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Giacomo Po, Yue Huang, Yang Li, Kristopher Baker, Benjamin Ramirez Flores, Thomas Black, James Hollenbeck, Nasr Ghoniem
Summary: This article develops a framework to investigate thermal creep and annealing in finite domains by coupling the climb motion of discrete dislocations with the diffusion of a continuum vacancy field. It formulates a model using irreversible thermodynamics and linearizes it for implementation in three-dimensional discrete dislocation dynamics simulations. The framework includes both diffusional creep and dislocation creep, and is applied to simulate annealing and estimate creep rate in various materials under different conditions.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Hualong Ge, Guisen Liu, Shijian Zheng, Yaqian Yang, Kui Liu, Xiuliang Ma
Summary: Through transmission electron microscopy and atomistic simulation, we investigated the mechanisms of MC decomposition at the atomistic to micro-scale. We found that MC can deform plastically during high-temperature creep and observed high-density dislocations and steps at matrix/MC interfaces. This release of stress concentration improves the creep resistance. Moreover, we discovered that MC decomposition into M23C6 occurs in grain interiors, leading to cracks at the partially coherent M23C6/MC interfaces, which is different from the existing understanding.
Article
Engineering, Mechanical
Longhui Chen, Chunhui Liu, Peipei Ma, Jianshi Yang, Lihua Zhan, Minghui Huang
Summary: Deformation anisotropy is a key factor affecting the dimensional accuracy and performance consistency of aluminum alloy components. Understanding and modeling the anisotropic creep ageing behavior is crucial for precise creep age forming. In this study, creep ageing responses were investigated in a heavily cold-rolled Al-Cu alloy, revealing significant in-plane creep anisotropy and slight anisotropy of yield strength. Microstructural analysis showed that the strong creep anisotropy is mainly determined by the preferential alignment of dislocation cells. A mechanism-based constitutive model was established to accurately describe the in-plane creep anisotropy.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Nanoscience & Nanotechnology
Jun Lu, Shuize Wang, Hao Yu, Guilin Wu, Junheng Gao, Honghui Wu, Haitao Zhao, Chaolei Zhang, Xinping Mao
Summary: The relationship between microstructural evolution and strengthening mechanisms in a vanadium micro-alloyed HSLA martensitic steel was systematically investigated. Precipitation and dislocation strengthening were found to be the main factors causing strength evolution with different isothermal holding time at 600 degrees C. The precipitation strengthening effect of solution quenching specimens was higher than that of isothermal annealing specimens because of its finer particle size and higher volume fraction of the MC precipitates.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Construction & Building Technology
Chunlei Dong, Shang Zhang, Jie Wang, Ying Hei Chui
Summary: Furfurylation treatment of wood can effectively reduce creep deformation, and furfurylated wood exhibits different creep performance compared to untreated wood in various stress levels and relative humidity environments.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Simin Shen, Yongpeng Zhuang, Peilin Luo, Hongxia Wang, Ping Chen, Lifei Wang, Weili Cheng, Hua Hou, Kwang Seon Shin
Summary: The secondary phase changes after traditional aging and creep aging of Mg-9Gd-2Nd-0.5Zr alloys were investigated, along with their effects on the mechanical properties. It was found that the presence of stress during creep aging increased the concentration of dislocations and promoted the precipitation rate of the b0 phase in the alloy, leading to a shortened peak aging time. The unidirectional stress during creep aging also resulted in anisotropy in the solute atomic diffusion coefficient, reduced alloy strength, and increased alloy elongation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Construction & Building Technology
Andreas Brugger, Peter Gamnitzer, Guenter Hofstetter
Summary: This publication presents an enhanced multiphase model that captures the instantaneous change in internal relative humidity of concrete upon external loading and improves the prediction of load-induced shrinkage.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Metallurgy & Metallurgical Engineering
Yi-hao Luo, Wei-li Cheng, Hui Yu, Hong-xia Wang, Xiao-feng Niu, Li-fei Wang, Hang Li, Zhi-yong You, Hua Hou
Summary: In this study, the creep properties and microstructural characteristics of Mg-5Bi-5Sn (BT55) alloy without and with Mn (BTM550) addition were compared. The results showed that adding Mn improved the creep performance of BTM550 alloy and affected the microstructural characteristics of the alloy.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Medicine, Research & Experimental
Milankumar V. Prajapati, Olujoba O. Adebolu, Benjamin M. Morrow, Joseph M. Cerreta
EXPERIMENTAL BIOLOGY AND MEDICINE
(2017)
Article
Engineering, Mechanical
B. M. Morrow, R. A. Lebensohn, C. P. Trujillo, D. T. Martinez, F. L. Addessio, C. A. Bronkhorst, T. Lookman, E. K. Cerreta
INTERNATIONAL JOURNAL OF PLASTICITY
(2016)
Article
Physics, Applied
David R. Jones, Benjamin M. Morrow, Carl P. Trujillo, George T. Gray, Ellen K. Cerreta
JOURNAL OF APPLIED PHYSICS
(2017)
Article
Nanoscience & Nanotechnology
Anil Kumar, Benjamin M. Morrow, Rodney J. McCabe, Irene J. Beyerlein
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2017)
Article
Materials Science, Multidisciplinary
B. Feng, C. A. Bronkhorst, F. L. Addessio, B. M. Morrow, E. K. Cerreta, T. Lookman, R. A. Lebensohn, T. Low
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2018)
Article
Materials Science, Multidisciplinary
Benjamin M. Morrow, Thomas J. Lienert, Cameron M. Knapp, Jacob O. Sutton, Michael J. Brand, Robin M. Pacheco, Veronica Livescu, John S. Carpenter, George T. Gray
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2018)
Article
Materials Science, Multidisciplinary
B. Feng, C. A. Bronkhorst, F. L. Addessio, B. M. Morrow, W. H. Li, T. Lookman, E. K. Cerreta
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2019)
Article
Materials Science, Multidisciplinary
D. W. Brown, D. P. Adams, L. Balogh, J. S. Carpenter, B. Clausen, V Livescu, R. M. Martinez, B. M. Morrow, T. A. Palmer, R. Pokharel, M. Strantza, S. C. Vogel
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2019)
Article
Materials Science, Coatings & Films
David R. Jones, Benjamin M. Morrow, Kendall J. Hollis
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2020)
Article
Physics, Applied
D. R. Jones, S. J. Fensin, B. M. Morrow, D. T. Martinez, R. S. Hixson
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Geochemistry & Geophysics
Sabrina Tecklenburg, Roberto Colina-Ruiz, Sovanndara Hok, Cynthia Bolme, Eric Galtier, Eduardo Granados, Akel Hashim, Hae Ja Lee, Sebastien Merkel, Benjamin Morrow, Bob Nagler, Kyle Ramos, Dylan Rittman, Richard Walroth, Wendy L. Mao, Arianna E. Gleason
Summary: The study examined natural kamacite samples from the Gibeon meteorite to investigate phase transition kinetics under shock compression up to 140 GPa. It found that the hcp phase rapidly formed at maximum compression and persisted for up to 9.5 ns. The work provides insights into the dynamic material properties of metallic planetary bodies and Earth's core elasticity during impact events.
Proceedings Paper
Physics, Condensed Matter
G. T. Gray, C. M. Knapp, D. R. Jones, V. Livescu, S. Fensin, B. M. Morrow, C. P. Trujillo, D. T. Martinez, J. A. Valdez
SHOCK COMPRESSION OF CONDENSED MATTER - 2017
(2018)
Proceedings Paper
Physics, Condensed Matter
E. K. Cerreta, F. L. Addessio, C. A. Bronkhorst, D. R. Jones, T. Lookman, D. T. Martinez, B. M. Morrow, P. A. Rigg, C. P. Trujillo
SHOCK COMPRESSION OF CONDENSED MATTER - 2017
(2018)
Article
Materials Science, Multidisciplinary
Veronica Livescu, Cameron M. Knapp, George T. Gray, Ramon M. Martinez, Benjamin M. Morrow, Bineh G. Ndefru
Proceedings Paper
Physics, Condensed Matter
Benjamin M. Morrow, J. Pablo Escobedo, Robert D. Field, Robert M. Dickerson, Patricia O. Dickerson, Carl P. Trujillo, Ellen K. Cerreta
SHOCK COMPRESSION OF CONDENSED MATTER - 2015
(2017)
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.