Article
Nanoscience & Nanotechnology
Alan J. Ardell
Summary: This study re-examines the kinetics of γ' precipitates in binary Ni-Al alloys. It was found that a previous investigation had made an unfortunate error in unit conversion, rendering all conclusions unreliable. The re-analysis shows that the equations describing skeletal coarsening kinetics are not trustworthy in providing useful quantitative information on the coarsening of non-skeletal microstructures and the elastic energy of γ' precipitates with misfit.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Yue Li, Zhijun Wang, Xianghan Gao, Yujian Wang, Junjie Li, Jincheng Wang
Summary: The kinetics of transient coarsening co-controlled by interface and matrix diffusion is studied in a new framework developed in the Lifshitz-Slyozov-Wagner space. The time for transient coarsening is found to change non-monotonically with the width and tail length of the initial distribution. A unique attractor state for the steady stage is identified, and the numerical origin of 'quasi-steady' distributions is revealed. The increase in volume fraction shortens the transient stage dominated by single mechanism but delays the transition to the diffusion-controlled stage.
Article
Physics, Fluids & Plasmas
Remi Goerlich, Luis Barbosa Pires, Giovanni Manfredi, Paul-Antoine Hervieux, Cyriaque Genet
Summary: This study proposes the use of a correlated noise bath to drive an optically trapped Brownian particle that mimics active biological matter. By controlling different parameters with unprecedented accuracy, the researchers are able to reach strongly correlated regimes that are not easily accessible in real active matter. They found that by adjusting the correlation time of the noise as a control parameter, transitions between two nonequilibrium steady states can be triggered without expending work but with a calorific cost. The measured heat production is directly proportional to the spectral entropy of the correlated noise, similar to Landauer's principle.
Article
Materials Science, Multidisciplinary
K. G. Wang
Summary: The kinetics of phase coarsening in a dense binary, two-phase system were theoretically studied and existing relations were recovered and generalized. Equations for particle size distribution and coarsening were rigorously derived. An interesting finding is that the scaling exponent, m, for the kinetics of phase coarsening at ultra high volume fractions takes values in the range 2 < m < 3, depending on the precise volume fraction of the dispersed phase, when varied over the narrow range 0.9 < V-V < 1. The particle size distributions derived in this study depend on volume fractions, which is different from Wagner's particle size distribution for interface-reaction-controlled phase coarsening. The current work substantiates that the kinetics of phase coarsening at ultra high volume fractions exhibits a blend of both interface-reaction-controlled and volume diffusion-controlled phase coarsening.
Article
Physics, Mathematical
Christian Seis
Summary: This article focuses on flow enhanced mixing of passive scalars in the presence of diffusion. Under the assumption of suitably integrable velocity gradient, we provide upper bounds on the exponential rates of enhanced dissipation. Recent constructions indicate the optimality of our results.
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Tiffany Wu, A. Plotkowski, A. Shyam, David C. Dunand
Summary: This study investigates the microstructures, thermal stability, ambient temperature strengthening, and creep resistance of three ternary Al-Ce-Ni alloys. The results show that the high volume fraction of intermetallic phases and extremely fine eutectic spacing/fiber diameter contribute to high ambient strengthening and enhanced creep resistance. The alloys also exhibit coarsening resistance up to 425 degrees C and remain substantial creep resistance at 300 degrees C, making them excellent materials for high temperature applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yanli Lu, Yi Wang, Yifan Wang, Meng Gao, Yao Chen, Zheng Chen
Summary: The study found that the hydrogen solution energy of V-Ni-M alloys is higher than pure vanadium, but the ability to capture hydrogen atoms is lower. In addition, V-Ni-M alloys exhibit higher resistance to embrittlement and smaller diffusion coefficients, making them suitable for hydrogen separation. In terms of mechanical properties, V-Ni-Ti has the best deformation resistance, while V-Ni-Si performs best in terms of thermal properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Yiqiang Hao, Xia Chen, Bin Chen
Summary: The structures and properties of the Mg-Gd-Cu lamellar interface were investigated through experiments and first-principles study. The study revealed that the most stable interface structure is a Gd-Cu terminated interface with the largest separation energy and lowest interface energy. This research provides insights into the understanding of the Mg2Cu/GdCu lamellar interface structure and offers a foundation for material structure and bonding characterization.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Y. H. Yang, Q. Lei, P. Zhang, W. Y. Wang, X. K. Zhang, Y. P. Li, K. C. Zhou, Z. Li
Summary: The study demonstrated that the addition of Nb can stabilize metastable Cr3Cu precipitates by reducing the interfacial energy between Cu and Cr, resulting in a higher high-temperature strengthening effect. The Cu-Cr-Nb alloy with stable L1(2) structured Cr3Cu precipitates showed significantly improved high-temperature strength compared to the b.c.c. structured Cr precipitates.
MATERIALS RESEARCH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Hongbing Yang, Baoming Wang, Hong Zhang, Bing Shen, Yuanyuan Li, Ming Wang, Jianjun Wang, Wensheng Gao, Yueming Kang, Lu Li, Yanhao Dong, Jiangong Li, Ju Li
Summary: In this study, we report the gradual coarsening of sub-10 nm corundum nanoparticles at room temperature, indicating active surface diffusion at a surprisingly low temperature. Prolific surface diffusion is confirmed by in-situ transmission electron microscopy mechanical deformation, demonstrating high-strain-rate Coble pseudoelasticity. Additionally, anomalously small activation energy and growth stagnation are found in high-temperature coarsening experiments, suggesting additional chemical driving forces beyond physical capillarity.
Article
Materials Science, Multidisciplinary
Hengxin Xu, Shoichi Hirosawa, Makoto Tanimura
Summary: Ni-Al-V alloys exhibit excellent creep resistance at high temperatures due to the sluggish interdiffusion of constituent elements within the L12-Ni3(Al, V) matrix. In this study, the intrinsic diffusion coefficients of Ni, Al, and V in quasi-binary Ni3Al1-xVx (x = 0, 0.125, 0.25, 0.5) were quantified using first-principles calculations, aiming to investigate the effect of V concentration on the coarsening behavior of L12 domains. The results revealed that the addition of V reduces the intrinsic diffusion coefficients of Ni and Al, while the intrinsic diffusion coefficient of V remains significantly smaller. This suppressed diffusion of Ni and Al by V addition can explain the experimentally observed slower coarsening rates of L12 domains in Ni3Al0.58V0.42 and Ni3Al0.48V0.52 alloys.
Article
Nanoscience & Nanotechnology
Qian Zhang, Scott Barnett, Peter Voorhees
Summary: Interfacial energy can induce particle migration in a system with temperature or electric potential gradients, causing a circular particle to move as a circle under a constant unidirectional gradient. Linear stability analysis suggests that migrating circular particles are morphologically stable under these conditions.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Zeyu Bian, Yulong Cai, Dongdong Zhang, Yakai Xiao, Qian Wang, Yong Zhang, Mingliang Wang, Huawei Zhang, Haowei Wang
Summary: In the eutectic AlFeNi-0.2Sc alloy, two types of Al3Sc precipitates (matrix precipitates and interface precipitates) were identified, and their effects on mechanical properties were analyzed. The alloy exhibited isotropic strengthening behavior at 300°C, but displayed anisotropic strengthening behavior at 400°C due to the coarsening of interface precipitates. The load transfer effect from interface precipitates was found to be the major strengthening mechanism for creep properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Review
Materials Science, Multidisciplinary
Boxuan Cao, Yilu Zhao, Tao Yang, Chain Tsuan Liu
Summary: Co-rich high-temperature alloys with higher melting points and superior particle coarsening resistance have been recognized as promising candidates for the development of next-generation high-temperature structural materials.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Metallurgy & Metallurgical Engineering
A. Nazarov
Summary: A mathematical apparatus for studying interdiffusion in three-component systems has been developed, which considers the non-equilibrium distribution of vacancies and their impact on component fluxes. Solutions of a linearized system of interrelated diffusion equations for three components and vacancies are obtained. It has been found that two interdiffusion coefficients have significant effects on the time dependence of component density distributions.
PHYSICS OF METALS AND METALLOGRAPHY
(2022)
Review
Materials Science, Multidisciplinary
Alan J. Ardell, Pascal Bellon
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
(2016)
Article
Materials Science, Multidisciplinary
Alan J. Ardell
JOURNAL OF MATERIALS SCIENCE
(2016)
Article
Materials Science, Multidisciplinary
Alan J. Ardell
PHILOSOPHICAL MAGAZINE LETTERS
(2017)
Article
Chemistry, Physical
Alan J. Ardell, Marta Pozuelo
Article
Materials Science, Multidisciplinary
Alan J. Ardell
PHILOSOPHICAL MAGAZINE
(2014)
Article
Nanoscience & Nanotechnology
Alan J. Ardell
SCRIPTA MATERIALIA
(2013)
Article
Materials Science, Multidisciplinary
Alan J. Ardell
JOURNAL OF MATERIALS SCIENCE
(2020)
Correction
Materials Science, Multidisciplinary
Alan J. Ardell
JOURNAL OF MATERIALS SCIENCE
(2020)
Article
Materials Science, Multidisciplinary
James F. Hickman, Yuri Mishin, Vidvuds Ozolins, Alan J. Ardell
Summary: By reanalyzing experimental data, it was found that the coarsening behavior of solid Sn particles in liquid Pb-Sn matrix aligns with the trans-interface-diffusion-controlled (TIDC) theory, contradicting other theories. The coarsening process is controlled by diffusion at the diffuse interface, independent of volume fraction and in disagreement with diffusion in the host matrix phase.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Alan J. Ardell
Summary: This study analyzed the coarsening kinetics of gamma ' precipitates in binary Ni-Al alloys and found that the interfacial free energy sigma decreases with increasing temperature. The temperature-dependent transition radius r(trans) was calculated, and the validity of using TIDC coarsening equations was confirmed through comparison with values obtained from traditional LSW kinetics.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Alan J. Ardell
Summary: This review examines the splitting behavior of gamma' precipitates in six different alloys and discusses two possible mechanisms: purely elastic splitting driven by competition between elastic and interfacial free energies, and thermodynamically driven splitting involving precipitation of Ni-Al or Ni-Si solid solution gamma phases within supersaturated gamma' particles. The main conclusion is that thermodynamically driven splitting is responsible for the observed phenomena, except for the dendritic growth of Ni3Si precipitates. Splitting was observed in alloys with compositions lying within the single-phase gamma regions of the binary Ni-Al and Ni-Si phase diagrams, and in alloys with aging temperatures at or barely below the solvus temperatures. The nature of secondary gamma' precipitation suggests that some alloys exceeded the reported compositions, enabling precipitation during solution treatment followed by thermodynamically driven splitting during slow cooling. The absence of splitting under quenched and isothermally aged conditions supports the viability of the thermodynamically driven mechanism.
JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION
(2022)
Correction
Chemistry, Physical
Alan J. Ardell
JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION
(2022)
Article
Nanoscience & Nanotechnology
Alan J. Ardell
Summary: This study re-examines the kinetics of γ' precipitates in binary Ni-Al alloys. It was found that a previous investigation had made an unfortunate error in unit conversion, rendering all conclusions unreliable. The re-analysis shows that the equations describing skeletal coarsening kinetics are not trustworthy in providing useful quantitative information on the coarsening of non-skeletal microstructures and the elastic energy of γ' precipitates with misfit.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
Alan J. J. Ardell
Summary: This article critically reviews the data on the equilibrium solubilities of the alpha AlLi solid solution phase and the ordered metastable delta' Al3Li precipitate phase, and proposes a new binary alloy phase diagram. The equations for the equilibrium solubilities of Li in the alpha and delta' phases are derived. The new phase diagram is based on extensive re-analysis of previously published data, including additional data not considered before, and excludes non-equilibrium data.
JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION
(2023)
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.
