Article
Chemistry, Physical
M. Myshlyaev, G. Korznikova, T. Konkova, E. Korznikova, A. Aletdinov, G. Khalikova, G. Raab, S. Mironov
Summary: In this study, the advanced capabilities of electron backscatter diffraction (EBSD) were used to investigate the role of dynamic recrystallization in the superplastic deformation of a fine-grained material. The results showed that dynamic recrystallization occurred only locally and had a minor contribution to microstructural evolution. Therefore, the preservation of the nearly-equiaxed grain morphology associated with superplasticity cannot be attributed to dynamic recrystallization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Ivan S. Zuiko, Sergey Mironov, Sergey Betsofen, Rustam Kaibyshev
Summary: Lowering the welding temperature below the particle dissolution threshold was shown to effectively suppress abnormal grain growth during post-weld solution treatment of FSWed 2519 aluminum alloy. This processing strategy can improve thermal stability by preventing precipitation of fine dispersoids in the welded material during subsequent annealing.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Chunfei Li, Josiah Dubovi, Clay Klein
Summary: This article presents a method to determine facet orientation using SEM and EBSD, which is validated with facets on spherical particles of 20 μm in an Al60Cu25Fe15 alloy. The experimental results show that the surface of the facet is parallel to the {100} lattice plane of a cubic phase.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Physical
Esmaeil Damavandi, Salman Nourouzi, Sayed Mahmood Rabiee, Roohollah Jamaati, Jerzy A. Szpunar
Summary: The microstructure and texture of an Al-Si-Cu alloy after high-temperature ECAP were analyzed by EBSD. The inhomogeneity of the ECAP process in different regions and the effect on grain refinement and particle size were investigated. The bottom of the ECAP die led to significant microstructure refinement in the Al alloy, while the top experienced remarkable fragmentation of particles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Alec I. Saville, Amy J. Clarke
Summary: This study introduces a reconstruction process to evaluate the microstructural evolution of the high temperature fl-Ti phase in a Ti-Cu binary alloy. While the reconstruction of martensitic microstructures was successful, the reconstruction of pearlitic microstructures was not effective. However, this analysis provided new insights into the interfacial crystallographic orientations of pearlitic Ti-Cu microstructures.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
Chun-Hao Chen, Pei-Ing Lee, Tung-Han Chuang
Summary: This study investigates the microstructure evolution of Ag-alloy bonding wire during electromigration (EM) using electron backscatter diffraction (EBSD), providing a new perspective to settle the controversy over the diffusion mechanism. The study focuses on grain growth, the influence of coincidence site lattice (CSL) on the grain boundary network, texture transition, and the impact of thermal energy during EM. A stage-like transition in the dominant diffusion mechanism is proposed and substantiated based on microstructure evolution.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Xianfeng Liao, Linhan Li, Kalubi Ren, Yanlin Jia, Yong Pang, Zhu Xiao, Yanbin Jiang, Zhou Li
Summary: The effects of grain size, grain boundary type, and misorientation on the initiation of discontinuous precipitates in a Cue5Ni e1.25Si alloy are investigated in this study. It is found that smaller grain sizes result in a higher percentage of discontinuous precipitates. Only random grain boundaries are capable of initiating discontinuous precipitates, while coincident site lattice boundaries are not. There is also a difference in the initiation of discontinuous precipitates depending on the misorientation axis.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Xuefeng Zhu, Zhu Xiao, Junhong An, Hongyun Jiang, Yanbin Jiang, Zhou Li
Summary: A Phi 40 mu m Cu-4 wt%Ag alloy wire with high strength and high electrical conductivity was prepared by continuously directional solidification and cold drawing. The study investigated the evolution of microstructure and properties, revealing the main deformation mechanisms and strengthening mechanism of the alloy during different stages of the drawing process.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Sangmin Lee, Yong-Deok Im, Ryo Matsumoto, Hiroshi Utsunomiya
Summary: C-HSR rolling can improve the balance of mechanical properties and electrical conductivity of Cu x Al alloy by increasing dislocation density and reducing grain size.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Esmaeil Damavandi, Salman Nourouzi, Sayed Mahmood Rabiee, Roohollah Jamaati, Jerzy A. Szpunar
Summary: The Bc route of ECAP method was successfully applied to analyze microstructure of Al-Si-Cu alloy. At least four passes of route -B-C are needed to achieve uniform distribution of fine IMCs and ESPs. PSN and CDRX are important mechanisms in refining the aluminum matrix in Al-Si-Cu alloy.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Chijioke Kenneth Akuata, Feliksianus Robby Gunawan, Piyada Suwanpinij, Daniela Zander
Summary: The effect of a single addition of 0.1 wt.% Cr on the microstructure evolution and localized corrosion susceptibility of an Al-Zn-Mg-Cu-Zr (7449) alloy was systematically investigated. The addition of 0.1 wt.% Cr resulted in a decrease in recrystallized fraction due to the formation of Cu- and Zn-containing E (Al18Mg3Cr2) dispersoids and larger as-cast grain size. Additionally, the formation of Cu- and Zn-containing E (Al18Mg3Cr2) dispersoids and eta Mg(Zn,Cu,Al)(2) phase depleted alloying elements from solid solution and affected grain-boundary precipitation.
Article
Materials Science, Multidisciplinary
Liuqing Peng, Guang Zeng, Di Wang, Jingwei Xian, Shouxun Ji, Hongyi Zhan, Christopher M. Gourlay
Summary: This study investigates the formation of Al-Mn IMCs in Mg-9Al-0.7Zn-0.2Mn alloy produced by high-pressure die casting and direct chill casting. The results show that controlling solidification and filtration during casting is important for ensuring small Al-Mn intermetallic particles in these casting processes.
Article
Materials Science, Multidisciplinary
Shun Tokita, Cheng Yi Liu, Yutaka S. Sato
Summary: This study investigates the joining of Al/Cu and Al/Ni dissimilar metals using ultrasonic spot welding. The results show that the vibration amplitude and welding time have a greater impact on joint strength than welding pressure. Optimization of welding parameters allows for high-strength joints that fracture at the Al upper plate. Al/Ni bonding requires a narrower range of welding time to achieve higher tensile shear load compared to other material combinations. Texture analysis reveals recrystallized grains with the GOSS orientation in high-strength dissimilar joints.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Chun-Hao Chen, Yu-Chang Lai, Tung-Han Chuang
Summary: The microstructural evolution of Ag-4Pd ribbon under various annealing conditions was investigated in this study using the EBSD technique. The results showed abnormal grain growth after prolonged annealing treatment, with calculated grain growth time exponent (n) and activation energy providing insights into the dominance of grain boundary diffusion in the material. The deviation of n value and activation energy from those of pure silver could be attributed to alloying elements and twin boundaries within the microstructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Zhenghua He, Jiande Liu, Xiaofei Zhu, Xinya Zhai, Yuhui Sha, Hongbo Hao, Lijia Chen
Summary: Sharp texture and enhanced magnetostriction were achieved in Fe-Ga thin sheets through secondary recrystallization. The evolution of texture, inhibitor, and magnetostriction during the annealing process were analyzed. A fine and homogeneous microstructure with a strong g-fiber and weak Goss and {310}<001> texture was produced.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(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.