Article
Metallurgy & Metallurgical Engineering
Tomotsugu Shimokawa, Takumi Oto, Tomoaki Niiyama
Summary: Molecular dynamics simulations were used to investigate the effect of cementite decomposition on ferrite/cementite interface-mediated plastic deformation. It was found that cementite decomposition causes the interface dislocation nucleation site to lose function and increases the yield stress of the ferrite/cementite microstructure. Additionally, the thicker the amorphous cementite layer, the more difficult it is for plastic deformation to propagate from the ferrite phase to the cementite phase.
ISIJ INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Zhimin Ding, Bo Liang, Zhenfeng Xu, Jiaoyang Sun, Rujin Tian, Feng Yan
Summary: The growing interface structure of pearlite in 100Mn13 high carbon high manganese steel was investigated using SEM and TEM after solution treatment at 1323 K and subsequent aging treatment at 823 K. The results show that longer pearlite lamellae, consisting of ferrite and cementite lamellae, are formed in the initial growth stage of the pearlite colony, with protrusions and branches present in the M3C/g interface. The cementite lamella is divided into two parts along the (010) M3C plane, which differ in terms of edge dislocations and (010) M3C lattice arrangement. Additionally, the wavy morphology of the ferrite lamella's edge interface, including two peaks with small curvature radius, accommodates more C atoms and accelerates the transformation process. Physical models for the growth of cementite lamella with protrusions and branches, and ferrite lamella with two peaks and three troughs, are proposed.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Anuj Bisht, Michael Kalina, Eylul Suadiye, Gunther Richter, Eugen Rabkin
Summary: In this study, nanoscale bimetallic strips were fabricated by one-sided coating with Pd, leading to slight bending of the strips. The temperature-induced shape changes of the Au-Pd strips were investigated via in-situ thermal actuation. The results demonstrate that single crystalline metallic nanowhiskers with controlled curvature, chemical composition, and thermal behavior can be produced using interface engineering and chemical interdiffusion.
Article
Materials Science, Multidisciplinary
Yuto Yajima, Norimitsu Koga, Chihiro Watanabe
Summary: The inhomogeneous strain distribution and morphology of cementite introduced by tensile deformation of pearlitic steel were quantitatively evaluated. Spheroidized colonies exhibited higher strains and the degree of spheroidization was found to be the main influence on deformability. The values of introduced strain varied in different types of colonies with the same Lcem/Lcol ratio.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Chunwang Zhao, Zhaoshi Dong, Jiajie Shen
Summary: In this study, the misfit dislocation at the Ge/Si hetero-interface was quantitatively investigated using high-resolution transmission electron microscopy and geometric phase analysis. A modified Foreman model was proposed to describe the strain field around the misfit dislocation core more accurately by introducing a new half width of the core. Comparison between experimentally measured strain field and theoretically calculated strain field showed that the modified Foreman model with the variable factor a=2 is a perfect strain model for misfit dislocations at the Ge/Si hetero-interface.
Article
Materials Science, Coatings & Films
Feifei Ji, Weiwei Deng, Haifei Lu, Liujun Wu, Kaiyu Luo, Jinzhong Lu
Summary: This study investigates the mechanism behind misfit dislocations at different grain sizes using laser shock peening (LSP) and severe plastic deformation. The results show that extrusion and torsion of the lattice play important roles in modifying d-spacing and the quantity of misfit dislocations as the grain size is refined. This finding is significant for designing the interfaces between HCP and BCC crystals in dual- or multi-phase metallic materials.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Pengcheng Liu, Xingang Liu, Xiangwei Jiang, Hui Li, Langhong Lou
Summary: The lattice constants, phase interface microstructure, and stress rupture properties of a nickel-based single crystal superalloy after thermal exposure at 1100 degrees C for different times were investigated. It was found that the lattice constants decreased and the misfit became more negative after 200 hours of exposure, remaining unchanged after 500 hours. The release of misfit stress was achieved through the transformation of the interface and the formation of dislocations. The stress rupture lives decreased significantly after thermal exposure, but the morphology and size of the interfacial dislocation network remained similar to the unexposed alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Kai Chen, Hongxian Xie, Yanhui Qie, Huiqiu Deng
Summary: Misfit dislocations have a significant impact on the nucleation and growth of helium bubbles, with helium bubbles energetically preferring to nucleate at the intersections of misfit dislocations or on some misfit dislocations. During the bubble growing process, metal interstitial atoms pushed out by the bubble are directly absorbed into nearby misfit dislocations, leading the helium bubble to move away from the bimetal interface.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Zhen Cai, Xiaolong Gan, Yanqi Li, Sheng Liu, Siqian Bao, Guang Xu
Summary: The effects of strain on the microstructure and mechanical properties of high-carbon steel were studied. It was found that strain influenced the pearlite transformation and cementite spheroidization, and increasing strain resulted in decreased strength but increased elongation of the steel.
Article
Chemistry, Multidisciplinary
Hongbo Xie, Qiuyan Huang, Junyuan Bai, Shanshan Li, Yang Liu, Jianguang Feng, Yuansheng Yang, Hucheng Pan, Hongxiao Li, Yuping Ren, Gaowu Qin
Summary: The study found that in a model Mg-Nd-Mn alloy, nonsymmetrical segregation of solutes occurred in linear tilt grain boundaries to generate ordered interfacial superstructures. This phenomenon is totally different from the classical McLean-type segregation and refreshes our understanding on strain-driven interface segregation behaviors.
Review
Chemistry, Applied
Yingyan Li, Xiuying Liu, He Liu, Lijie Zhu
Summary: Proteins are essential for foaming and emulsification in food processing, but they adsorb slowly. Recently, surfactants like saponins have gained attention for their fast adsorption at interfaces. Therefore, combining proteins and surfactants can overcome the limitations of both components. Natural surfactants have become increasingly popular for their health benefits, and the interfacial properties of proteins and saponins have been extensively studied.
FOOD HYDROCOLLOIDS
(2023)
Article
Metallurgy & Metallurgical Engineering
Yutaro Amemiya, Nobuo Nakada, Satoshi Morooka, Makoto Kosaka, Masaharu Kato
Summary: This study utilized the EBSD technique to analyze the internal stress in pearlite and found that the internal stress gradually decreases after pearlitic transformation. Furthermore, it was discovered that various crystallographic orientation relationships exist in pearlite, and the invariant-line criterion on the ferrite/cementite interface plays an important role in orientation relationship selection.
ISIJ INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Zhifeng Huang, Vladyslav Turlo, Xin Wang, Fei Chen, Qiang Shen, Lianmeng Zhang, Irene J. Beyerlein, Timothy J. Rupert
Summary: In this study, the segregation behavior of Y at basal-prismatic interfaces in Mg alloys was investigated using atomistic simulations. It was found that interfaces with disconnections and dislocations are more energetically stable and have lower segregation energy, indicating the importance of local defects and atomic hydrostatic stress in segregation behavior at complex interfaces in Mg alloys.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Engineering, Multidisciplinary
Neha Duhan, B. K. Mishra, I. V. Singh
Summary: In this study, the eXtended finite element method (XFEM) is used to analyze the behavior of edge dislocations near a heterostructure interface with nonuniform misfit strain. A new enrichment method is introduced to account for the singular behavior of the electric potential. Nonlinear material properties due to temperature are considered for a thermo-electro-elastic analysis. The results show the effect of nonuniform misfit strain distribution on the dislocations near the interface and propose a new expression for the Peach-Koehler force considering the combined effect of multiple fields.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
K. M. Yang, G. S. Liu, H. Y. Ma, J. Song, Q. Li, N. Q. Chen, Y. Q. Wang, D. Chen, Y. Liu, T. X. Fan
Summary: In this study, we propose an innovative strategy to generate semi-coherent homophase interfaces within the same grain by varying surface energy density using high-temperature graphene deposition. The resulting high-density misfit dislocation arrays can form stable helium nanochannels after helium implantation, providing efficient management of helium and surface protection of metals.
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.