Article
Chemistry, Physical
Hidetoshi Somekawa, Kimiyoshi Naito
Summary: The effect of micro-alloying with different elements on grain boundary sliding behavior at intermediate temperatures was examined. The micro-alloying element affects the damping capacity and the tensile response of the alloy. The partial contribution of grain boundary sliding to deformation is the major reason for the deviation of experimental results from calculated values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Songwei Huang, Pengfei Zhou, Fuxin Luo, Huiming Chen, Weibin Xie, Wenjing Zhang, Hang Wang, Bin Yang, Bingfeng Peng
Summary: The microstructure and precipitation behavior of Cu-Ni-Mn alloys during solution treatment and aging process were studied. The dissolved Ni and Mn atoms in the Cu matrix contribute to the solid-solution strengthening effect. The larger atomic size misfit of Mn atoms results in a higher solid-solution strengthening effect than that of Ni atoms. Both continuous precipitation and discontinuous precipitation occur in the Cu-Ni-Mn alloys at 450 degrees C during aging, with a higher Ni and Mn content leading to a higher fraction of discontinuous precipitation colonies. The continuous precipitation of dispersed NiMn nanoparticles inhibits the growth of discontinuous precipitation colonies by consuming Ni and Mn solute atoms. The precipitation strengthening provided by the NiMn nanoprecipitates is the main strengthening mechanism in the peak-aged Cu-Ni-Mn alloys, with over 80% contribution to the total strength increment in the Cu-20Ni-20Mn alloy aged for 48 hours. The volume fraction of NiMn nanoprecipitates increases with the increase of Ni and Mn content after aging for 48 hours, which, combined with the grain boundary embrittlement induced by discontinuous precipitation, leads to significant embrittlement in the aged Cu-Ni-Mn alloys.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Kosuke Ueki, Ryo Hirano, Masaaki Nakai
Summary: The development of an Fe-Mn-Mg alloy by MA and SPS was reported for the first time to improve the corrosion rate of Fe-based alloys for biodegradable materials. The 10Mg alloy exhibited the highest compressive strength and a lower corrosion rate compared to the 0Mg alloy.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Teng Tu, Xianhua Chen, Tao Chen, Yuan Yuan, Fusheng Pan
Summary: The study demonstrates that adding Ge element to Mg alloys can improve both the elastic modulus and strength, while refining the grain size and promoting the formation of high-modulus phases. The Mg-10Gd-1.5Ag-0.2Mn-3.5Ge alloy exhibits the best comprehensive mechanical properties with a high modulus, strength, and ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Ceramics
Yong-Ming Zhang, Ting Song, Jun-Hong Tian, Zi-Jiang Liu, Si-Min Xue, Xiao-Wei Sun
Summary: The structural and mechanical properties of ScB2 and Sc0.5TM0.5B2 (TM = Ti, V, Zr) alloys were investigated, and it was found that the introduction of TM significantly improved the mechanical properties of ScB2. Additionally, Sc0.5TM0.5B2 (TM = Ti, V, Zr) alloys exhibited strong hardness and stability, making them potential superhard multifunctional materials.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Fernando Maccari, Alexander Zintler, Thomas Brede, Iliya A. Radulov, Konstantin P. Skokov, Leopoldo Molina-Luna, Oliver Gutfleisch
Summary: The ferromagnetic Mn-Al-C tau-phase has potential to be developed as a permanent magnet, but its metastable nature and decomposition to nonmagnetic phases negatively affect its magnetic properties. This study investigates a novel method using electric current-assisted annealing to obtain pure tau-phase samples. Results show that increasing electric current density reduces the required temperature for phase formation, with a maximum shift of 140 degrees C at 45 A mm(-2). Magnetic properties, however, are not affected by the electric current density. Microstructural analysis reveals the nucleation of the tau-phase at grain boundaries and the presence of twin boundaries during phase growth, resulting in similar extrinsic magnetic properties.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
B. S. Liu, H. X. Li, Y. P. Ren, H. B. Xie, H. C. Pan, M. Jiang, G. W. Qin
Summary: Investigation of phase relationships in the Mg-rich corner of the Mg-Zn-Gd ternary system at 400-475 degrees C reveals changes in equilibrium states, coexistence phenomena, and peritectic eutectic transformations. The compositions of the Z, I, F, and W phases and the solubility of Gd in the alpha-Mg solid solution are significantly affected by the addition of Zn when the phases are in equilibrium.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Crystallography
Halit Subutay, Ilyas Savkliyildiz
Summary: By investigating the ball-milling mechanism in the Mg-6Sn-1Na ternary materials system, a suitable mechanical alloying method was found. Different structures were observed during the milling process, ultimately resulting in samples with homogeneously distributed smaller particles, which exhibited the highest density, modulus of elasticity, and hardness values.
Article
Materials Science, Multidisciplinary
Zhao Yang, Gang Wang, Chao Xu, Miao Wang, Taiki Nakata, Hongyu Xu, Lin Geng, Shigeharu Kamado
Summary: In this study, Mg-Gd-Y-Mn-Sc alloys with different Mn and Sc contents were prepared. The addition of Mn and Sc refined the grain size and promoted the dynamic recrystallization and dynamic precipitation during hot extrusion, resulting in improved strength-ductility balance of the alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Ke-Da Jiang, Zhen Zhang, Wen-Bo Zhu, Qing-Lin Pan, Yun-Lai Deng, Xiao-Bin Guo
Summary: The addition of V significantly improves the tensile properties and fatigue strength of Al-Zn-Mg alloys, but has little effect on the aging hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
D. V. Lazurenko, G. D. Dovzhenko, V. V. Lozanov, I. Y. Petrov, T. S. Ogneva, K. I. Emurlaev, I. A. Bataev
Summary: It has been found that the addition of transition metals Mn and Pt can retain the Ti5Al11 phase at room temperature. Through experiments and density functional theory predictions, it was discovered that the addition of Mn and Pt significantly reduces the total energy, volume, and bond length of the Ti5Al11 compound, thereby suppressing the Ti5Al11 -> TiAl transformation and preserving the lattice tetragonality, ultimately leading to the retention of the Ti5Al11 phase at room temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Metallurgy & Metallurgical Engineering
He Xie, Guo-hua Wu, Xiao-long Zhang, Zhong-quan LI, Wen-cai Liu, Liang Zhang, Bao-de Sun
Summary: This study investigated the effects of different Y additions on the microstructural evolution and mechanical performance of cast Mg-3Nd-0.2Zn-0.5Zr alloy. The results showed that increasing Y content led to changes in the microstructure and increased strength of the alloy.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Materials Science, Multidisciplinary
Masakazu Tane, Hiroki Nishio, Daisuke Egusa, Taisuke Sasaki, Eiji Abe, Eisuke Miyoshi, Shota Higashino
Summary: The effects of Al and oxygen additions on the diffusionless isothermal w transformation in Ti-V-based alloys were studied. It was found that the addition of oxygen increases the stability of the /3-phase and suppresses the transformation, while the addition of Al retains the phase stability and cannot suppress the transformation.
Article
Materials Science, Multidisciplinary
Panpan Wang, Haitao Jiang, Yujiao Wang, Yun Zhang, Shiwei Tian, Yefei Zhang, Zhiming Cao
Summary: The poor corrosion resistance of commercial Mg alloys can be improved by adding minor amounts of Ca or Sn elements. In this study, the corrosion behavior of Mg-3Al-1Zn (AZ31) alloy with Ca or Sn additions was investigated. The results showed that AZ31-0.2Sn alloy exhibited the best corrosion resistance, followed by AZ31-0.2Ca alloy. The addition of Sn increased the potential of alpha-Mg and contributed to the formation of a dense SnO2 film, while Ca enriched in the corrosion product layer, resulting in a more compact, stable, and protective layer.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Ning Fang, Chunming Zou, Zunjie Wei, Hongwei Wang, Xuejian Zhang, Tao Chang
Summary: The addition of Ge accelerates the aging response of Al-Si-Cu alloy by forming Si-Ge particles that act as heterogeneous nucleation sites for 0?-Al2Cu phases, while the addition of Mg results in the early precipitation of Q?-Al5Cu2Mg8Si6 phases in the alloy. The combined addition of both Ge and Mg leads to the formation of Mg2Ge phases and an accelerated aging response, providing increased strength to the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Coatings & Films
Katayun Barmak, Sameer Ezzat, Ryan Gusley, Athary Jog, Sit Kerdsongpanya, Asim Khanya, Erik Milosevic, William Richardson, Kadir Sentosun, Amirali Zangiabadi, Daniel Gall, William E. Kaden, Eduardo R. Mucciolo, Patrick K. Schelling, Alan C. West, Kevin R. Coffey
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2020)
Article
Multidisciplinary Sciences
Yanhao Tang, Lizhong Li, Tingxin Li, Yang Xu, Song Liu, Katayun Barmak, Kenji Watanabe, Takashi Taniguchi, Allan H. MacDonald, Jie Shan, Kin Fai Mak
Article
Multidisciplinary Sciences
Lorenz Maximilian Schneider, Shanece S. Esdaille, Daniel A. Rhodes, Katayun Barmak, James C. Hone, Arash Rahimi-Iman
SCIENTIFIC REPORTS
(2020)
Article
Physics, Applied
Katayun Barmak, Kadir Sentosun, Amirali Zangiabadi, Erik Milosevic, Daniel Gall, Miroslav Zecevic, Ricardo A. Lebensohn, Jerrold A. Floro
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
Lorenz Maximilian Schneider, Shanece S. Esdaille, Daniel A. Rhodes, Katayun Barmak, James C. Hone, Arash Rahimi-Iman
Summary: 2D excitons in TMDCs exhibit interesting effects related to valley pseudo-spin degree of freedom and long-range exchange interactions, as well as coupling with light states. Experimental evidence shows that exciton dispersion in high-quality hexagonal-BN-encapsulated WSe2 monolayer samples can be measured using Fourier-space spectroscopy, confirming the energy scale. The study of exciton fine-structure's pseudo-spin and valley polarization can provide insights into valley decoherence effects and the development of future 'optical-valleytronic' devices.
Article
Chemistry, Multidisciplinary
Daniel A. Rhodes, Apoorv Jindal, Noah F. Q. Yuan, Younghun Jung, Abhinandan Antony, Hua Wang, Bumho Kim, Yu-Che Chiu, Takashi Taniguchi, Kenji Watanabe, Katayun Barmak, Luis Balicas, Cory R. Dean, Xiaofeng Qian, Liang Fu, Abhay N. Pasupathy, James Hone
Summary: In semimetallic T-d-MoTe2, the superconductivity is dramatically enhanced with decreasing thickness, with a critical temperature (Tc) increasing up to 7.6 K for monolayers, showing a 60-fold increase compared to bulk Tc. The response to high in-plane magnetic fields is unique compared to other 2D superconductors, reflecting the canted spin texture of the electron pockets.
Article
Physics, Multidisciplinary
Jue Wang, Qianhui Shi, En-Min Shih, Lin Zhou, Wenjing Wu, Yusong Bai, Daniel Rhodes, Katayun Barmak, James Hone, Cory R. Dean, X-Y Zhu
Summary: In this study, two distinct phase transitions for interlayer excitons in MoSe2/WSe2 heterobilayer were revealed using time and spatially resolved photoluminescence imaging, setting fundamental limits for achieving quantum states of interlayer excitons. The transitions include trapped excitons in moire potential transforming into modestly mobile exciton gas, and then into highly mobile charge separated electron-hole plasma, confirmed as the Mott transition through photoconductivity measurements.
PHYSICAL REVIEW LETTERS
(2021)
Article
Electrochemistry
Ryan Gusley, Quintin Cumston, Kevin R. Coffey, Alan C. West, Katayun Barmak
Summary: This study found that Ru electrodeposited from nitrosyl sulfate solutions forms a porous layer of (0001)-oriented Ru crystallites, with an average film density lower than that of bulk Ru. Increasing the applied current density results in higher density of the Ru layer but lower current efficiency.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Bumho Kim, Yue Luo, Daniel Rhodes, Yusong Bai, Jue Wang, Song Liu, Abraham Jordan, Baili Huang, Zhaochen Li, Takashi Taniguchi, Kenji Watanabe, Jonathan Owen, Stefan Strauf, Katayun Barmak, Xiaoyang Zhu, James Hone
Summary: In MoSe2 monolayers, the quantum yield of trions increases with decreasing defect density, with a long lifetime of approximately 230 ps allowing for direct observation of their diffusion.
Article
Physics, Applied
Ryan R. Gusley, Quintin Cumston, Kevin R. Coffey, Alan C. West, Katayun Barmak
Summary: The electrodeposition of Cu onto epitaxial Ru(0001) seed layers resulted in the growth of a bicrystal structure with an improvement in resistivity, despite the compressive misfit strain between the layers. The Cu initially grew as isolated islands before coalescing into a rough, contiguous film with large grain sizes. As the thickness increased, the film transitioned into a planar film with nanometric islands, but at thicknesses exceeding 200 nm, anisotropic growth led to increased surface roughness.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Qianhui Shi, En-Min Shih, Daniel Rhodes, Bumho Kim, Katayun Barmak, Kenji Watanabe, Takashi Taniguchi, Zlatko Papic, Dmitry A. Abanin, James Hone, Cory R. Dean
Summary: Exciton condensates are macroscopic coherent states formed by the condensation of electron-hole pairs. Bilayer heterostructures provide a platform for studying and realizing exciton condensates, but the separation between layers limits the strength of exciton binding. This study observes exciton condensates in naturally occurring bilayer WSe2 and investigates their properties using capacitance spectroscopy.
NATURE NANOTECHNOLOGY
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Ouri Karni, Elyse Barre, Sze Cheung Lau, Roland Gillen, Eric Yue, Lior Gal, Tzach Yaffe, Bumho Kim, Kenji Watanabe, Takashi Taniguchi, Meir Orenstein, Janina Maultzsch, Katayun Barmak, Ralph H. Page, Tony F. Heinz
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Article
Electrochemistry
Ryan Gusley, Sameer Ezzat, Kevin R. Coffey, Alan C. West, Katayun Barmak
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2020)
Article
Electrochemistry
Ryan Gusley, Kadir Sentosun, Sameer Ezzat, Kevin R. Coffey, Alan C. West, Katayun Barmak
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2019)
Article
Materials Science, Multidisciplinary
Gabriel Martine La Boissoniere, Rustum Choksi, Katayun Barmak, Selim Esedoglu