Article
Materials Science, Multidisciplinary
Kyu-Sik Kim, Dong-Yeol Wi, Jae-Seung Lee, Kee-Ahn Lee
Summary: The effect of stored energy on the cementite spheroidization rate of medium carbon cold-heading-quality steel was investigated. By controlling the microstructural characteristics of the steel, faster spheroidization times were achieved by tuning the initial microstructures with their large amounts of stored energy.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Xiao-Yu Zhao, Xian-Ming Zhao, Chun-Yu Dong, Yang Yang, Huai-Bin Han
Summary: During the spheroidizing annealing process, the dissolution and coarsening progress of different initial structures are asynchronous due to varying interlamellar spacing. The granular cementite in the spheroidized structure is fine, uniform, and dense. The initial structure of degenerated pearlite (D-P) is highly sensitive to the austenitization temperature, with cementite easily coarsening under high temperatures.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Metallurgy & Metallurgical Engineering
Min Qi, Hongyan Wu, Linxiu Du, Xiaolei Zhang, Zhixin Zhang, Mingbo Zhang
Summary: This study focuses on the laboratory simulation of a Cr-Mo-microalloyed medium-carbon steel used in the industrial production of fine-blanking steel. By changing the coiling temperature during hot rolling and conducting cold rolling with different total reductions and subcritical annealing, different microstructures were obtained. The microstructure evolution during spheroidization annealing was analyzed using various techniques, revealing the behavior of the different microstructures. The results showed that a 50% reduction during cold rolling is the most suitable parameter for carbide spheroidization.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Tobias Mittnacht, P. G. Kubendran Amos, Daniel Schneider, Britta Nestler
Summary: The morphological evolution of rod-shaped structures in polycrystalline systems is governed by a unique transformation mechanism that begins with energy minimization events at triple junctions.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
V. Mattos Ferreira, M. G. Mecozzi, R. H. Petrov, J. Sietsma
Summary: The austenitization of an initial pearlitic microstructure is simulated using the phase field model to understand the formation of White Etching Layer (WEL) in pearlitic railway steels. The simulations consider the resolution of cementite lamellae and the presence of pro-eutectoid ferrite. The growth kinetics and morphology of austenite obtained from simulations are compared with experimental observations.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
L. T. Mushongera, P. G. Kubendran Amos, B. Nestler, K. Ankit
Article
Thermodynamics
Hui Xing, Kumar Ankit, Xianglei Dong, Huimin Chen, Kexin Jin
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2018)
Article
Physics, Applied
Kumar Ankit, Benjamin Derby, Rahul Raghavan, Amit Misra, Michael J. Demkowicz
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Materials Science, Multidisciplinary
V. Pavan Laxmipathy, Fei Wang, Michael Selzer, Britta Nestler, Kumar Ankit
COMPUTATIONAL MATERIALS SCIENCE
(2019)
Article
Chemistry, Physical
Kumar Ankit, Martin E. Glicksman
EUROPEAN PHYSICAL JOURNAL E
(2020)
Article
Physics, Applied
William Farmer, Kumar Ankit
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
Martin E. Glicksman, Kumar Ankit
PHILOSOPHICAL MAGAZINE
(2020)
Article
Physics, Applied
Rahul Raghavan, Pei-En Chen, Yang Jiao, Kumar Ankit
Summary: This study investigates the influence of seed morphology and contact angles on the morphological evolution of surface features in phase-separating alloy films using a three-dimensional phase-field approach, and quantifies film nanostructures using a statistical morphological descriptor. The research provides insights into kinetic pathways and reveals a hidden length scale correlation present at all contact angles, as well as highlights similarities between simulation-based findings and those obtained from co-deposition experiments on Cu-Ta and Cu-Mo-Ag films.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Ankita Roy, Amey Luktuke, Nikhilesh Chawla, Kumar Ankit
Summary: This study presents a method that combines material thermodynamics with diffusional kinetics to predict the growth characteristics of Cu6Sn5 in Cu-Sn alloy. The calculations indicate the limited role of IMC/Sn interfacial curvature in determining the rate at which the IMC layer thickens.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Peichen Wu, William Farmer, Ashif Iquebal, Kumar Ankit
Summary: In this study, a data-driven emulation technique that combines machine learning with microstructure modeling is used to accurately predict the evolution of grain boundary slits in degrading copper interconnects under electromigration.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Rahul Raghavan, Peichen Wu, Kumar Ankit
Summary: This study utilizes a phase-field modeling approach to simulate the nanostructural evolution in ternary alloy films synthesized using physical vapor deposition. Through the analysis of deposition rate and alloy composition, it is found that the impact of processing conditions on nanostructural evolution is less significant at equi-molar compositions, while the composition has a more pronounced effect when the atomic ratios of alloying elements are skewed.
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Peichen Wu, Ashif Sikandar Iquebal, Kumar Ankit
Summary: Phase-field models are powerful tools for simulating microstructural evolution, but their accuracy relies on complex mathematical models and high-performance computing. Existing surrogate microstructure models have limited accuracy due to dimensional reduction. To overcome these limitations, we propose a data-driven emulator combining deep-learning techniques and tensor decomposition to predict microstructural evolution. We compare the emulator with phase-field simulations and discuss its trade-off between runtime speed-up and accuracy.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Physics, Fluids & Plasmas
Pei-En Chen, Rahul Raghavan, Yu Zheng, Hechao Li, Kumar Ankit, Yang Jiao
Summary: We propose reduced-dimension metrics for measuring the distance between microstructures and quantifying their evolution pathways. These metrics effectively decompose the structural features in the system into regular polyhedral basis with different symmetries. They can be applied to extract phase separation dynamics and analyze pattern evolution, with potential applications in processing-structure-property relationships and real-time processing control of complex material systems.
Article
Physics, Applied
Rahul Raghavan, Arnab Mukherjee, Kumar Ankit
JOURNAL OF APPLIED PHYSICS
(2020)
Proceedings Paper
Engineering, Manufacturing
M. Glicksman, K. Ankit
JOINT 5TH INTERNATIONAL CONFERENCE ON ADVANCES IN SOLIDIFICATION PROCESSES (ICASP-5) & 5TH INTERNATIONAL SYMPOSIUM ON CUTTING EDGE OF COMPUTER SIMULATION OF SOLIDIFICATION, CASTING AND REFINING (CSSCR-5)
(2019)
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.