Article
Materials Science, Multidisciplinary
Benjamin Klaes, Jeoffrey Renaux, Rodrigue Larde, Fabien Delaroche, Felipe F. Morgado, Leigh T. Stephenson, Baptiste Gault, Francois Vurpillot
Summary: Three-dimensional field ion microscopy is a powerful technique to analyze material at a truly atomic scale. This article presents the first images of an amorphous sample and shows the capability to visualize compositional fluctuations in a metallic glass that is extremely challenging to observe directly using other microscopy techniques. The technique provides imaging of recrystallized phases in annealed samples with superior spatial resolution compared to atom probe tomography.
MICROSCOPY AND MICROANALYSIS
(2022)
Article
Chemistry, Physical
Luc Jacobs, Cedric Barroo
Summary: The study utilized field emission techniques to image the crystallinity of dark chocolate at the nanoscale and demonstrated the possibility of studying complex organic molecules and their properties down to the nanoscale. This highlights the potential for further research in understanding the structure and properties of complex food systems like chocolate.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Jiangting Wang, Hossein Beladi, Libo Pan, Fang Fang, Jun Hu, Lingxue Kong, Peter D. Hodgson, Ilana Timokhina
Summary: This study successfully used continuous cooling process to achieve interphase precipitation-strengthened ferrite in dual-phase steels, with nano-sized (Ti, Mo) C interphase precipitates forming hardened ferrite phase, providing a new strategy for dual-phase steel production.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Xiaolin Li, Haozhe Li, Linxi Liu, Xiangtao Deng, Zhaodong Wang
Summary: The formation mechanism of complex precipitates in Nb-V microalloyed steel has been studied using HRTEM and APT, revealing two precipitation mechanisms: replacement and heterogeneous modes. Core-shell precipitates formed by the heterogeneous mechanism exhibit double direction Moire ' fringe, while those with uniform distributed V and Nb atoms are formed by the replacement mechanism. The APT results show an increase in the V to Nb ratio with particle size, consistent with previous TEM findings.
Article
Nanoscience & Nanotechnology
Vinothkumar Govindaraj, Peter Hodgson, Rajkumar P. Singh, Hossein Beladi
Summary: In this study, a new precipitation hardenable stainless steel modified primarily with Ni and Mn was designed using Thermo-Calc, resulting in improved mechanical properties after heat treatment. The evolution of Cu-precipitate was identified as the main factor causing changes in hardness and mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Jialong Tian, Gang Zhou, Wei Wang, Qingmiao Hu, Zhouhua Jiang, Ke Yang
Summary: The effect of cobalt on the precipitation hardening behavior of maraging stainless steels was investigated. It was found that cobalt addition could increase peak hardness and accelerate the aging process, as well as enhance the density of precipitates, leading to a stronger contribution to precipitation hardening.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Mechanics
Magnus Boasen, Kristina Lindgren, Martin Oberg, Mattias Thuvander, Jonas Faleskog, Pal Efsing
Summary: The fracture toughness and microstructural evolution of a thermally aged low alloy steel weld metal were investigated and compared to a reference. The study found that thermal ageing led to brittle fracture initiation from grain boundaries, resulting in a reduction of fracture toughness in the aged material.
ENGINEERING FRACTURE MECHANICS
(2022)
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
Nanoscience & Nanotechnology
Shipeng Shu, Anthony De Luca, David C. Dunand, David N. Seidman
Summary: Micro-additions of 0.25 at.% Mn and/or 0.10 at.% Mo to dilute Al-0.08Zr-0.014Sc-0.008Er-0.09Si alloys affect precipitate evolution and resulting strengths, providing solid-solution strengthening and improving ambient-temperature strength and elevated-temperature creep resistance. Mn-modified precipitates exhibit higher number density, while Mo-modified precipitates display improved coarsening-resistance. Both Mn and Mo additions enhance creep resistance at 300 degrees C, with Mn-bearing alloys showing a more significant effect.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
S. Zeisl, A. Lassnig, A. Hohenwarter, F. Mendez-Martin
Summary: The influence of severe plastic deformation on the hardness and precipitation behavior of a Co-free maraging steel was investigated in this study. It was found that severe plastic deformation transformed the microstructure, delayed austenite reversion, and accelerated and influenced the precipitation reaction, thus affecting the characteristics of intermetallic phases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
Xinlei Zhou, Bin Wang, Tianyi Zeng, Wei Yan, Junhua Luan, Wei Wang, Ke Yang, Zengbao Jiao
Summary: The effect of pre-deformation on nanoscale precipitates and hardness of a maraging stainless steel was studied. The results showed that pre-deformation can increase the hardness and shorten the incubation time of precipitates.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Xueyun Gao, Haiyan Wang, Jie Li, Meng Lv, Zhongwang Wu, Yiming Li, Gang Sha, Huiping Ren
Summary: This study investigates the influence of Ce on the mechanical performance of B2-NiAl precipitation strengthened maraging steel. The Ce-bearing steel demonstrates a high ultimate tensile strength and good tensile ductility. It was found that Ce affects the precipitation behavior of B2-NiAl particles and increases the fraction of high angle grain boundaries in the steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
X. Q. Rong, H. Guo, M. Enomoto, C. J. Shang
Summary: The addition of Al in the Fe-2Cu-1.5Mn-1.5Ni alloy was found to enhance Cu nucleation in the matrix and on dislocations, leading to a significant increase in hardness. The higher dislocation density in Al-containing steel may be attributed to a larger number of Cu particles delaying the recovery and annihilation of dislocations in the martensite matrix. Additionally, the concentrations of Cu and Mn in Cu clusters were lower, while those of Al and Ni were higher than the values of both metastable equilibrium bcc-Cu and equilibrium fcc-Cu phases.
Article
Nanoscience & Nanotechnology
Tong Xi, Xinrui Zhang, Xueliang Yin, Chunguang Yang, Ke Yang
Summary: The behavior of Cu-rich precipitates in 316LN-Cu SS austenitic stainless steel aged at 600, 700, and 800 degrees Celsius was systematically studied. The Cu-rich precipitates were found to increase the hardness and strength of the steel, with optimal strength and elongation observed in specimens aged at 700 degrees Celsius for 6 hours. The study also revealed significant changes in the size and composition of the precipitates, as well as interface segregation effects that influenced interfacial free energies.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Qin Shen, Daozhu Huang, Wenqing Liu, Fangjie Li, Qiang Lu
Summary: This study investigated the nanoscale precipitation and mechanical properties of two CuNiAl-containing steels with different Cu contents aged at 500 degrees C. The results showed that the coprecipitation of Cu-rich and NiAl phases during aging contributed to precipitation strengthening effects. The influence of Cu content on the evolution of precipitates was studied using atom probe tomography (APT). The results demonstrated that increasing Cu content enhanced the number density of precipitates and accelerated the precipitation process. The two steels exhibited different precipitation sequences based on their Cu contents. Steel 1 with low Cu content exhibited a precipitation sequence of supersaturated solid solution, NiAl, NiAl + Cu, while Steel 2 with high Cu content presented a sequence of supersaturated solid solution, Cu, Cu + NiAl. After further aging, the precipitates in both steels transformed into Cu/NiAl co-precipitates without isolated Cu-rich phases and isolated NiAl phases.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
V. V. Natarajan, S. Liu, V. S. A. Challa, R. D. K. Misra, D. M. Sidorenko, M. D. Mulholland, M. Manohar, J. E. Hartmann
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2016)
Article
Nanoscience & Nanotechnology
V. V. Natarajan, V. S. A. Challa, R. D. K. Misra, D. M. Sidorenko, M. D. Mulholland, M. Manohar, J. E. Hartmann
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2016)
Article
Nanoscience & Nanotechnology
S. Liu, V. S. A. Challa, V. V. Natarajan, R. D. K. Misra, D. M. Sidorenko, M. D. Mulholland, M. Manohar, J. E. Hartmann
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2017)
Article
Materials Science, Multidisciplinary
J. -S. Wang, M. D. Mulholland, G. B. Olson, D. N. Seidman
Article
Nanoscience & Nanotechnology
P. K. C. Venkatsurya, Z. Jia, R. D. K. Misra, M. D. Mulholland, M. Manohar, J. E. Hartmann
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2012)
Article
Nanoscience & Nanotechnology
P. K. C. Venkatsurya, R. D. K. Misra, M. D. Mulholland, M. Manohar, J. E. Hartmann
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2013)
Article
Nanoscience & Nanotechnology
P. K. C. Venkatsurya, R. D. K. Misra, M. D. Mulholland, M. Manohar, J. E. Hartmann
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2014)
Article
Materials Science, Multidisciplinary
P. K. C. Venkatsurya, R. D. K. Misra, M. D. Mulholland, M. Manohar, J. E. Hartmann
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2014)
Article
Materials Science, Multidisciplinary
Michael D. Mulholland, David N. Seidman
MICROSCOPY AND MICROANALYSIS
(2011)
Article
Nanoscience & Nanotechnology
Michael D. Mulholland, David N. Seidman
SCRIPTA MATERIALIA
(2009)
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.