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
Materials Science, Multidisciplinary
Rui Wang, Yanzhou Ji, Tian-Le Cheng, Fei Xue, Long-Qing Chen, You-Hai Wen
Summary: Oxide growth is a complex process involving reactive species transport, heterogeneous reactions, and microstructure evolution. We have developed a phase-field model to predict the growth kinetics of oxide in a multicomponent alloy during high temperature oxidation, with a focus on the transition from internal oxidation to external oxidation. We have analyzed and compared the predicted kinetics and oxide morphology with classical theories and an existing analytical model, discussing the assumptions and limitations of the analytical models. Additionally, we have demonstrated the importance of the morphology and distribution of initial oxide nuclei in the later stage oxide connectivity and transition to external oxidation.
Article
Materials Science, Multidisciplinary
Chuanlai Liu, Alistair Garner, Huan Zhao, Philip B. Prangnell, Baptiste Gault, Dierk Raabe, Pratheek Shanthraj
Summary: The incorporation of CALPHAD database into a phase-field framework successfully simulated the complex kinetics of non-equilibrium grain boundary microstructures in high-strength Al-Zn-Mg-Cu alloys, which is crucial for understanding the quenching process of the alloys.
Article
Materials Science, Multidisciplinary
Sigurd Wenner, Constantinos Hatzoglou, Eva Anne Mortsell, Petter Asholt
Summary: High-Si aluminum foundry alloys gain strength through the formation of nanoprecipitates upon heat treatment. Room-temperature storage affects the kinetics of early aging, with Cu additions accelerating the formation of hardening precipitates. However, 1 month of room-temperature storage negates the positive effect of Cu. The solubility limits of Si and Mg during solution heat treatment temperature mainly limit the maximum achievable strength. This study contributes to understanding the solute balance, early aging kinetics, and differences between wrought and foundry alloys through transmission electron microscopy and atom probe tomography analysis.
Article
Physics, Multidisciplinary
V. O. Kharchenko, Xianggang Kong, Tianyuan Xin, Lu Wu, O. M. Shchokotova, D. O. Kharchenko, S. Kokhan
Summary: We develop a phase field model to simulate the precipitation of secondary phases in ternary alloys with very small amounts of doping. This model is used to study the precipitation of the beta phase in the Zr-Nb-Sn commercial alloy during thermal treatment. Our analysis reveals that the dissolved Tin is mostly segregated around the phase interface by trapping vacancies. We investigate the kinetics, size and distribution of the precipitates, as well as the concentration of species in the precipitates and matrix. We find that the Lifshits-Slyozov-Wagner distribution can be used to predict statistical properties of the precipitates. Additionally, we discuss the mechanical response of the precipitated solid, specifically the plastic deformations. We show that the yield strength increases during precipitation and study the yield and ultimate stresses at different shear rates for the annealed alloy. We describe the transition to plastic flow through the evolution of dislocation structures and analyze the formation and growth of slip planes and dislocation loop-precipitate interaction governed by the difference in elastic moduli. It is demonstrated that the emergence of dislocation loops around precipitates follows the Orowan mechanism.
Article
Chemistry, Physical
Hong Mao, Changlin Zeng, Zhikang Zhang, Xiong Shuai, Sai Tang
Summary: The research found that increasing lattice misfits in supersaturated aluminum alloys can promote the nucleation rate of precipitates, resulting in more but smaller precipitates, with varied morphologies depending on the level of lattice misfit. Furthermore, a higher lattice misfit leads to earlier nucleation of the second phase, which effectively inhibits the movement of dislocations.
Article
Chemistry, Physical
Dongyang Li, Hao He, Jia Lou, Hao He, Zheyu He, Fenghua Luo, Yimin Li, Chang Shu
Summary: In Ti-rich Ni-Ti alloys prepared by metal injection molding without solution or aging treatment, non-equilibrium state Ni4Ti3 precipitation was observed. The precipitation was found to be caused by C and O impurities leading to the formation of a Ni-rich region acting as a precursor for Ni4Ti3 precipitation. The absence of a liquid phase during pre-alloyed powder sintering was identified as another reason for this phenomenon. The transformation temperature associated with the non-balanced formation of precipitation was also discussed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Katrin Thieme, Christian Patzig, Brian Topper, Christian Thieme, Stephan Gierth, Christian Ruessel, Thomas Hoeche
Summary: Glasses doped with terbium oxide show phase separation, with borate-rich droplets surrounded by a silicate matrix. The structural changes during phase separation and the local sites of the luminescent ions are investigated using scanning transmission electron microscopy and energy dispersive X-ray spectroscopy. The luminescence properties of the phase separated glasses are correlated with their nano-and microstructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Energy & Fuels
Chi Zhang, Siwei Zhu, Du Wang, Cheng Lei, Yan Zhao
Summary: In this study, the non-uniform lithium deposition in porous lithium metal anodes was simulated using an electrochemical phase field model. Four factors were investigated to enhance homogeneous lithium deposition and increase the capacity for inside-pore lithium deposition. It was found that increasing the diffusion coefficient of lithium ion and designing a structured lithium metal anode with gradient reaction constants and porosity can improve inside-pore lithium deposition.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Nanoscience & Nanotechnology
Liting Shi, Kayla Baker, Ryan Young, Jidong Kang, Jie Liang, Babak Shalchi-Amirkhiz, Brian Langelier, Yves Brechet, Christopher Hutchinson, Hatem Zurob
Summary: Cyclic deformation of solution treated AA6061 results in a high number density of Mg/Si clusters, contributing to a strength comparable to T6 condition. Subsequent heat treatment further increases strength, with a shorter aging time needed compared to traditional treatments. The presence of clusters plays a crucial role in promoting a higher number density of precipitates during aging.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Ang Zhang, Zhipeng Guo, Bin Jiang, Jinglian Du, Cuihong Wang, Guangsheng Huang, Dingfei Zhang, Feng Liu, Shoumei Xiong, Fusheng Pan
Summary: This study developed a solid-liquid-gas multiphase field lattice Boltzmann model to describe the complex interaction during solidification. The model was successfully validated and compared to other models, effectively describing the interaction between gas porosity and magnesium dendrite. It is suitable for exploring multiphase equilibrium and addressing problems involving solid-liquid-gas multiphase and multiphysical characteristics.
Article
Multidisciplinary Sciences
Xiaolong Xu, Shiqi Yang, Huan Wang, Roger Guzman, Yuchen Gao, Yaozheng Zhu, Yuxuan Peng, Zhihao Zang, Ming Xi, Shangjie Tian, Yanping Li, Hechang Lei, Zhaochu Luo, Jinbo Yang, Yeliang Wang, Tianlong Xia, Wu Zhou, Yuan Huang, Yu Ye
Summary: Natural superlattices MnBi2Te4(Bi2Te3)(n) (n=1, 2, ...) with band topology and reduced interlayer coupling provide a promising platform for exploring topological quantum states. In this study, the authors observe and investigate complex ferromagnetic-antiferromagnetic coexisting ground states in MnBi4Te7 (n=1) and MnBi6Te10 (n=2). The spatially inhomogeneous interlayer coupling and tunable exchange bias effect have been observed in MnBi2Te4(Bi2Te3)(n) (n=1, 2), providing design principles for future spintronic devices.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Tamsin E. Whitfield, Howard J. Stone, C. Neil Jones, Nicholas G. Jones
Summary: Research has shown that refractory metal high-entropy superalloys exhibit microstructural instability after high temperature exposure, leading to phase changes, morphology alterations, and intragranular precipitation, which may impact the alloy's mechanical and environmental properties.
Article
Chemistry, Physical
Diego de Araujo Santana, Claudio Shyinti Kiminami, Francisco Gil Coury
Summary: This study focuses on the prediction of yield strength of a newly developed alloy through experimental and modeling approaches. The results demonstrate that different strengthening mechanisms can be modeled independently with satisfactory accuracy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Zexin Wang, Chuanxin Liang, Dong Wang, Xiaodai Yue, Jiarong Li, Xiangdong Ding
Summary: Co is a valuable γ solid solution strengthening element in nickel-based superalloys, but its effect on the kinetics of γ' precipitation is controversial. In this study, phase field simulations were conducted to analyze the γ' precipitation process in Ni-Al-Co model superalloys and reveal the Co effect on the temporal evolution kinetics of the γ' phase. The simulations showed that the γ' coarsening rate initially decreases and then increases at 1173 K with increasing Co content, which can be attributed to the competition between the γ/γ' lattice misfit and interdiffusion coefficients. Our research provides a new perspective on the effect of Co concentration on the kinetics of γ' precipitation in Ni-Al-Co model superalloys and offers a guideline for designing novel multicomponent superalloys with superior microstructural stability.
Correction
Materials Science, Multidisciplinary
Vahid Fallah, Andreas Korinek, Nana Ofori-Opoku, Nikolas Provatas, Shahrzad Esmaeili
Article
Materials Science, Multidisciplinary
Vahid Fallah, Andreas Korinek, Nana Ofori-Opoku, Babak Raeisinia, Mark Gallerneault, Nikolas Provatas, Shahrzad Esmaeili
Article
Physics, Fluids & Plasmas
Bernadine A. Jugdutt, Nana Ofori-Opoku, Nikolas Provatas
Article
Materials Science, Multidisciplinary
Vahid Fallah, Brian Langelier, Nana Ofori-Opoku, Babak Raeisinia, Nikolas Provatas, Shahrzad Esmaeili
Article
Materials Science, Multidisciplinary
Nana Ofori-Opoku, Nikolas Provatas
Article
Materials Science, Multidisciplinary
Vahid Fallah, Nana Ofori-Opoku, Jonathan Stolle, Nikolas Provatas, Shahrzad Esmaeili
Article
Materials Science, Multidisciplinary
Vahid Fallah, Andreas Korinek, Nana Ofori-Opoku, Nikolas Provatas, Shahrzad Esmaeili
Article
Materials Science, Multidisciplinary
David Montiel, Sebastian Gurevich, Nana Ofori-Opoku, Nikolas Provatas
Article
Materials Science, Multidisciplinary
Harith Humadi, Nana Ofori-Opoku, Nikolas Provatas, Jeffrey J. Hoyt
Article
Materials Science, Multidisciplinary
Michael Greenwood, Nana Ofori-Opoku, Joerg Rottler, Nikolas Provatas
Article
Materials Science, Multidisciplinary
Nana Ofori-Opoku, Jonathan Stolle, Zhi-Feng Huang, Nikolas Provatas
Article
Materials Science, Multidisciplinary
Nana Ofori-Opoku, Vahid Fallah, Michael Greenwood, Shahrzad Esmaeili, Nikolas Provatas
Article
Physics, Fluids & Plasmas
Nana Ofori-Opoku, Jeffrey J. Hoyt, Nikolas Provatas