Article
Materials Science, Multidisciplinary
Dongsheng Wen, Michael S. Titus
Summary: This study investigates the driving force of Suzuki segregation in the Co-Ni binary system and predicts temperature- and composition-dependent stacking fault energies. Configurational and vibrational effects aid in stabilizing stacking faults, with segregation of Co to the innermost planes of the faults. The method developed here could be used to inform alloy design strategies and predict segregation in other interfacial problems.
Article
Materials Science, Multidisciplinary
Jinshu Xie, Jinghuai Zhang, Zhi Zhang, Qiang Yang, Kai Guan, Yuying He, Ru Wang, Hao Zhang, Xin Qiu, Ruizhi Wu
Summary: Formation of solute-enriched stacking faults (SESFs) and their transformation into long period stacking ordered (LPSO) phase in Mg alloys have been achieved in this study. The role and advantages of SESFs and LPSO phase were confirmed by experimental observations. These findings are significant for the development of high-strength and anti-corrosion Mg alloys.
Article
Materials Science, Multidisciplinary
Bailing An, Yan Xin, Rongmei Niu, Zhaolong Xiang, Yifeng Su, Jun Lu, Engang Wang, Ke Han
Summary: We studied the early nucleation of Ag precipitates on dislocations within Cu grains in a Cu-6 wt%Ag-0.15 wt%Sc alloy. The formation of planar defects released misfit strain on Cu/Ag interfaces, enhancing subsequent nucleation and growth of Ag precipitates.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Physical
Shang Peng, Yongjin Chen, Boya Wang, Xuefeng Zhou, Haijun Yu, Jianbo Wang, Wenge Yang, Xiang Gao
Summary: In this study, intrinsic layered defects with Li-ion-blocking capability were discovered in La2/3-xLi3xTiO3, and they were found to distribute uniformly at domain boundaries by forming enclosed loops. The research provides insights into the influence of these layered defects on Li-ion transport and their formation mechanism, paving the way for the development of novel perovskite solid-state electrolytes through microstructure engineering.
MATERIALS TODAY ENERGY
(2022)
Article
Nanoscience & Nanotechnology
Kai Guan, Mariko Egami, Daisuke Egusa, Hajime Kimizuka, Michiaki Yamasaki, Yoshihito Kawamura, Eiji Abe
Summary: In this study, SRO solute clusters in the I-1 type LPSO phases in Mg-CoY alloys have been investigated using atomic-resolution STEM and first-principles calculations. The Co3Y5 SRO cluster model embedded across the I-1-type SFs has been successfully constructed to enhance the energetic stability of the LPSO phases. The findings reveal the crucial role of solute SRO clusters in the formation and stability of LPSO phases in ternary Mg alloys.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Dongsheng Wen, Michael S. Titus
Summary: In this study, the solute segregation behavior and electronic origin of intrinsic stacking faults (ISF) in face-centered cubic Co-and Ni-alloys were predicted using first-principles density functional theory calculations. The driving force of segregation can be attributed to the confluence of the local atomic distortions, charge density redistribution, electron orbital interactions, and local magnetic interactions between the solute and the solvent atoms. These findings can be utilized in future alloy design efforts to improve mechanical properties via Suzuki segregation to planar defects.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Mu Li, Zhaohan Zhang, Arashdeep S. Thind, Guodong Ren, Rohan Mishra, Katharine Flores
Summary: The equiatomic NbVZr alloy features a dendritic BCC solid solution and Laves phases, with Nb contributing to the stability of these phases. The Laves phases strengthen the material by acting as obstacles to dislocation motion. High concentration of stacking faults in the Laves region confirms the low stacking fault energy predicted by calculations, which is expected to result in additional plasticity.
Article
Materials Science, Multidisciplinary
Qianqian Jin, Xiaohong Shao, Shijian Zheng, Yangtao Zhou, Bo Zhang, Xiuliang Ma
Summary: Understanding the interface structure between strengthening precipitates and matrix in alloys at the atomic level is crucial for tailoring the mechanical properties. High-resolution scanning transmission electron microscopy was used to study the semi-coherent interfaces in Mg-Zn-Y alloys, revealing unique features such as Shockley partial dislocations and dissociated structures. The interaction between dislocation arrays and solute atoms plays a key role in the stability and morphology of these interfaces, influencing the lateral growth of LPSO phases in Mg alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Lola Lilensten, Stoichko Antonov, Baptiste Gault, Sammy Tin, Paraskevas Kontis
Summary: This study investigates the differences in creep behavior of polycrystalline Ni-based superalloys with two different Nb contents, attributing the mechanical performance variation to phase transformations along planar faults. The presence of stacking faults and their composition in the alloys are analyzed using electron channeling contrast imaging and atom probe tomography, revealing insights into the underlying mechanisms of creep strain rate differences. The findings suggest a potential atomic-scale driven alloy design approach for enhancing creep resistance by promoting local phase transformations along planar faults at 750 degrees C.
Article
Nanoscience & Nanotechnology
Deping Zhang, Jinhui Zhang, Tao Xu, Yaqin Zhang, Chaojie Che, Dongdong Zhang, Jian Meng
Summary: This paper presents a new mechanism for increasing the creep resistance of magnesium alloys, namely reducing the minimum creep rate by introducing nano-spaced stacking faults. The finding provides a reference for developing magnesium alloys with superior creep resistance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Physics, Applied
Sami A. El Hageali, Harvey Guthrey, Steven Johnston, Andrew Norman, Jake Soto, Bruce Odekirk, Robert E. Stahlbush, Nadeemullah A. Mahadik, Brian P. Gorman, Mowafak Al-Jassim
Summary: This study investigates the nature, origin, behavior, and impact of trapezoidal defects in 4H-SiC epitaxial layers. Various imaging and microscopy techniques were used to identify the stacking faults and determine their origin. The defects were found to impact the carrier recombination and electrical performance of SiC devices.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
M. Gao, T. J. Chen, Z. X. Zhang
Summary: It was found that under 595 degrees Celsius, heating the Ti-A356 mixed powder compact could generate two kinds of TiAlSi intermetallics, tau 1 and tau 2, which are related to the local breakage of oxide films on neighboring Ti and A356 alloy powders. Tau 2 crystals were thinner due to their higher density of stacking faults. During the growth of tau 2 crystals, tau 1 lamellar domains were generated.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Guoming Zheng, Bin Tang, Wei Chen, Songkuan Zhao, Yizhen Xie, Xiaofei Chen, Jinshan Li, Lei Zhu
Summary: This study reveals that the plastic deformation mechanism of lamellar microstructure in TNM alloy changes from stacking faults to long-period stacking ordering with a slight increase in lamellar spacing. Multiple LPSO bands significantly enhance the work hardening response and trigger the TRIP effect, resulting in four times higher ductility than SF-deformed LM at 750°C without compromising yield strength. This finding provides novel insights into the development of high-performance TiAl alloys with extremely nano-LM at elevated temperatures.
MATERIALS RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Song Lu, Stoichko Antonov, Fei Xue, Longfei Li, Qiang Feng
Summary: This study analyzed creep defects and segregation-assisted local phase transformation processes in a gamma'-strengthened Co-based superalloy crept at high temperatures and pressures. The formation of non-coplanar deformation configuration was found to be assisted by local elemental segregation, and the movement of dislocations was trapped at the local gamma/gamma' interface. W segregation-assisted gamma'->chi phase transformation decreases deformation resistance, while Co segregation-assisted gamma'->gamma phase transformation at the LPD improves deformation resistance.
Article
Materials Science, Multidisciplinary
M. C. Yang, X. H. Du, C. X. Shi, W. P. Li, J. Y. Zhang, R. F. Zu, S. Yuan, T. H. Chou, J. C. Huang, G. S. Duan, B. L. Wu, J. Sun
Summary: Explored the mechanical response of a cold-rolled complex alloy at 700 degrees C as a function of ageing time, finding that long-term ageing led to an ultrafine-scaled recrystallized microstructure and high-content ordered precipitates. Transmission electron microscopy observations confirmed that abundant stacking faults and deformation induced twins were mainly responsible for the observed extra strain-hardened behavior during the critical plastic straining stage.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Chemical
Xiaofang Chen, Yan Liang, Li Wan, Zongli Xie, Christopher D. Easton, Laure Bourgeois, Ziyu Wang, Qiaoliang Bao, Yonggang Zhu, Shanwen Tao, Huanting Wang
CHEMICAL ENGINEERING SCIENCE
(2019)
Article
Materials Science, Multidisciplinary
Qingbo Jia, Paul Rometsch, Philipp Kuernsteiner, Qi Chao, Aijun Huang, Matthew Weyland, Laure Bourgeois, Xinhua Wu
Article
Materials Science, Multidisciplinary
Katharina T. Schwarz, Julian M. Rosalie, Stefan Wurster, Reinhard Pippan, Anton Hohenwarter
ADVANCED ENGINEERING MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
Yunhe Zheng, Yixian Liu, Nick Wilson, Shiqi Liu, Xiaojun Zhao, Houwen Chen, Jinfeng Li, Ziqiao Zheng, Laure Bourgeois, Jian-Feng Nie
Article
Multidisciplinary Sciences
Laure Bourgeois, Yong Zhang, Zezhong Zhang, Yiqiang Chen, Nikhil Medhekar
NATURE COMMUNICATIONS
(2020)
Article
Chemistry, Multidisciplinary
Meysam Sharifzadeh Mirshekarloo, Mandokht Shaibani, M. C. Dilusha Cooray, Christopher D. Easton, Laure Bourgeois, Sebastian Hernandez, Petar Jovanovic, Ludovic F. Dumee, Parama Chakraborty Banerjee, Mainak Majumder
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2020)
Article
Nanoscience & Nanotechnology
A. Katzensteiner, J. M. Rosalie, R. Pippan, A. Bachmaier
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Article
Materials Science, Multidisciplinary
Qingbo Jia, Fan Zhang, Paul Rometsch, Jingwei Li, Jitendra Mata, Matthew Weyland, Laure Bourgeois, Manling Sui, Xinhua Wu
Article
Chemistry, Multidisciplinary
Ruchi Pal, Laure Bourgeois, Matthew Weyland, Arun K. Sikder, Kei Saito, Alison M. Funston, Jayesh R. Bellare
Summary: Electron energy-loss spectroscopy (EELS) is a sensitive tool for characterizing polymeric materials, with important implications for compositional analysis. Reference spectra of carbon K-edge for six polymers and copolymers have been successfully acquired, allowing for chemical bond mapping with nanoscale spatial resolution in the future.
Article
Chemistry, Multidisciplinary
Johanna Christiane Saenger, Brian Richard Pauw, Birte Riechers, Andrea Zocca, Julian Rosalie, Robert Maass, Heinz Sturm, Jens Guenster
Summary: Filigree structures can be produced using two-photon polymerization (2PP) in the nonlinear light absorption range, even for ceramic structures with critical defect sizes. A transparent and photocurable suspension of nanoparticles with high mass fractions of yttria-stabilized zirconia particles (YSZ) is used to suppress light scattering during the process. This method allows for the fabrication of ceramic structures with high resolution and altered mechanical properties.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Shenghan Su, Laure Bourgeois, Nikhil V. Medhekar
Summary: The high strength of structural aluminium alloys is due to the controlled precipitation of specific intermetallic phases. In this study, we investigate the AlPt system and design a workflow to predict the thermodynamics of various phases and their precipitation sequence in binary alloying systems. Our findings suggest that Al2Pt will precipitate first and form bulk-like interfaces similar to Al2Au rather than Al2Cu.
Article
Materials Science, Multidisciplinary
Adnan Fareed, Julian M. Rosalie, Sourabh Kumar, Satyakam Kar, Tilmann Hickel, Sebastian Faehler, Robert Maass
Summary: Stress-induced austenite-martensite transition in Ni-Mn-Ga shape-memory alloys was studied in single crystalline austenitic thin films. The behavior of the transition varied with the thickness of the films, with smaller thickness leading to instabilities and larger thickness allowing fully reversible transformations. The findings provide insights into the effects of reduced dimensions and constraints on the transformation stress.
MATERIALS & DESIGN
(2023)
Article
Nanoscience & Nanotechnology
Ying Han, Julius Kruse, Julian M. Rosalie, Jan Radners, Philipp von Hartrott, Birgit Skrotzki
Summary: The fatigue properties of forged aluminum alloy were studied under different stress ratios and aging states. The results showed that overaging significantly reduced the fatigue life of the alloy, which was mainly attributed to the decrease in yield strength and the increase in precipitate radius.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Proceedings Paper
Materials Science, Multidisciplinary
Zezhong Zhang, Laure Bourgeois, Yong Zhang, Julian M. Rosalie, Nikhil Medhekar
17TH INTERNATIONAL CONFERENCE ON ALUMINIUM ALLOYS 2020 (ICAA17)
(2020)
Article
Polymer Science
Ruchi Pal, Laure Bourgeois, Matthew Weyland, Arun K. Sikder, Kei Saito, Alison M. Funston, Jayesh R. Bellare
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.
