Article
Electrochemistry
Debashish Sur, Howie Joress, Jason Hattrick-Simpers, John R. Scully
Summary: Compositionally complex alloys containing multiple principal elements provide opportunities to discover new materials with unique properties. This paper demonstrates a methodology for evaluating the passivation behavior of alloys using high-throughput electrochemical methods.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
S. Shuang, G. J. Lyu, D. Chung, X. Z. Wang, X. Gao, H. H. Mao, W. P. Li, Q. F. He, B. S. Guo, X. Y. Zhong, Y. J. Wang, Y. Yang
Summary: In this study, we developed a series of medium-entropy alloys (MEAs) with high strength, superior fracture toughness, and ultra-high corrosion resistance. Interestingly, our MEAs exhibit an unusual anti-corrosion behavior as their corrosion resistance increases with increasing acidity. This behavior can be attributed to the surface chemical complexity of our MEAs, which facilitates the formation of metastable medium entropy passive films.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Review
Chemistry, Physical
Ling Qiao, Yong Liu, Jingchuan Zhu
Summary: High-entropy alloys (HEAs) have attracted significant attention in various fields due to their unique microstructures and excellent properties. Machine learning methods can accelerate the discovery of new materials and aid in composition design. The combination of machine learning and multi-scale computation shows great potential in materials science and the future prospects of HEAs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
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
Electrochemistry
Jian Huang, Hao Shi, Yongsong Ma, Huayi Yin, Dihua Wang
Summary: A combinatorial electrode was designed to prepare multiple different HEAs in the same electrolysis process, enabling high-throughput materials screening.
Article
Chemistry, Physical
Qiannan Wang, Hongwang Yang, Xiaojiao Zuo, Yinxiao Wang, Jiahao Yao
Summary: High-throughput screening technology is used to study refractory multi-principal element alloys films with high W content. By adjusting the parameters, a component with the best hardening performance is successfully obtained. The film has a stable structure and excellent wear resistance.
Article
Materials Science, Multidisciplinary
Brent Vela, Cafer Acemi, Prashant Singh, Tanner Kirk, William Trehern, Eli Norris, Duane D. Johnson, Ibrahim Karaman, Raymundo Arroyave
Summary: Development of next-generation gas turbines requires the design and fabrication of novel high-temperature structural materials capable of operating beyond 1300 degrees C. We propose a high-throughput alloy design framework that can discover new refractory multi-principal element alloys (MPEAs) for high-temperature applications under multiple property constraints. Using this framework, we identified a set of 214 MoNbV-rich alloys that meet the relevant constraints. DFT analysis and experimental characterization revealed that the Mo30Nb35Ta5V25W5 alloy outperforms 1546 MPEAs in terms of the specified constraints.
Article
Materials Science, Multidisciplinary
S. P. O'Brien, J. Christudasjustus, E. Delvecchio, N. Birbilis, R. K. Gupta
Summary: A multi-principal element alloy with equiatomic concentrations of Cr, Fe, Mn, and V was synthesized using arc melting. Characterization techniques including X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy confirmed the presence of a BCC matrix with a dispersion of a secondary phase in the CrFeMnV MPEA. Cyclic potentiodynamic polarization tests in 0.6 M NaCl demonstrated excellent corrosion resistance, surpassing that of stainless steel 304L, as indicated by the high breakdown and repassivation potentials. X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry provided insights into the formation of a multi-layer surface film under constant immersion and potentiostatic conditioning.
Article
Chemistry, Physical
Y. W. Xiao, Z. Cheng, S. H. Li, S. Z. Wang, H. H. Wu, J. H. Gao, H. T. Zhao, F. B. Grumsen, G. Winther, G. L. Wu, X. P. Mao, O. V. Mishin
Summary: The microstructure, crystallographic texture, and tensile properties of a CoCrFeNi medium entropy alloy were studied after cold rolling and annealing. It was found that shear bands and layers of mixed orientations act as preferential nucleation sites for recrystallized grains during annealing. High mechanical strength and good ductility were obtained in samples annealed at 550°C or 570°C, attributed to a fine-scale bimodal microstructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Materials Science, Multidisciplinary
Saeid Akrami, Parisa Edalati, Masayoshi Fuji, Kaveh Edalati
Summary: High-entropy ceramics, containing five or more cations, have attracted significant attention recently for their superior properties in various structural and functional applications. Efforts have been made to increase entropy, minimize Gibbs free energy and achieve stable single-phase high-entropy ceramics. These materials have potential for future applications in fields such as oxides, nitrides, carbides, borides, and hydrides.
MATERIALS SCIENCE & ENGINEERING R-REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Magdalena Lassinantti Gualtieri, Elena Colombini, Veronica Testa, Giovanni Bolelli, Roberto Giovanardi, Paolo Veronesi
Summary: This study aims to provide some guidelines for map acquisition and sample preparation based on data from various nanoindentation techniques. The results show that conventional metallographic preparation leads to a deep plastically deformed layer on the surfaces. Electropolishing efficiently removes this layer. However, difficulties may arise due to preferential corrosion in a multiphase system. Nanoindentations of adequately prepared surfaces of CoCrFeNi result in an important indentation size effect (ISE), which affects measurements at depths lower than ca 2000 nm.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
S. Dasari, A. Sarkar, A. Sharma, B. Gwalani, D. Choudhuri, V. Soni, S. Manda, I. Samajdar, R. Banerjee
Summary: This paper investigates the recovery and recrystallization processes in high entropy alloys during isothermal annealing, revealing an increase in Sigma 3 twin boundaries and distribution of ordered B2 precipitates after cold working and subsequent annealing. After long-term annealing at 700 degrees Celsius, the alloy shows excellent mechanical properties in terms of tensile yield stress and ductility.
Article
Materials Science, Multidisciplinary
Carolina Frey, Ravit Silverstein, Tresa M. Pollock
Summary: An equiatomic HfNbTaRuZr refractory multi-principal alloy was cast and characterized through arc melting and vacuum annealing. Annealed materials exhibited (Nb, Ta)-rich body-centered cubic (BCC), (Hf, Ru)-rich B 2, and (Hf, Zr)-rich hexagonal close-packed (HCP) phases, with preferential segregation of oxygen and nitrogen to the HCP phase. Splat quenching was used to refine grain size and microstructure, resulting in exceptional hardness due to nano-scale precipitates.
Article
Materials Science, Coatings & Films
Felipe Cemin, Saron R. S. de Mello, Carlos A. Figueroa, Fernando Alvarez
Summary: Single-phase crystalline NbTaTiVZr high-entropy alloy thin films were successfully achieved through appropriate selection of alloying elements and synthesis conditions, leading to specific structural modifications and improved mechanical properties. Controlling synthesis variables such as substrate biasing and heating can eliminate traditional crystallization strategies and provide potential applications for high-entropy alloy thin films in the field of refractory coating materials.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Xue Yin, Yankun Dou, Xinfu He, Ke Jin, Chenglong Wang, Yaguang Dong, Haoran Wang, Weihua Zhong, Yunfei Xue, Wen Yang
Summary: The impact behavior of refractory single-phase concentrated solid solution alloys, TiVTa and TiVTaNb, were studied for their potential application as structural materials in the nuclear field. The study found that TiVTaNb exhibited higher ductility and resistance to crack initiation and propagation compared to TiVTa.
Article
Materials Science, Multidisciplinary
Hobyung Chae, Mao Yuan Luo, E-Wen Huang, Eunjoo Shin, Changwoo Do, Soon-Ku Hong, Wanchuck Woo, Soo Yeol Lee
Summary: AM materials exhibit enhanced performance with post-processing being essential for reinforcing properties. By controlling tunable factors and strengthening mechanisms during post-processing, the study identified principal strengthening factors contributing to AM stainless steel under heat treatment and weighed their importance. The as-built sample showed unique microstructure with heterogeneous grain size distribution, retained austenite, high dislocation density, and dispersed oxide particles, primarily strengthened by dislocation forest and heterogeneous grain size. Aging slightly decreased dislocation strengthening, but superior aging enhancement was achieved by Cu-precipitates. Solid-solutionizing increased effective grain size and reduced dislocation density, shedding light on performance optimization of AM metals.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Vijay Mandal, Shashank Sharma, Sudhanshu S. Singh, J. Ramkumar
Summary: Laser surface texturing was applied to Inconel 718 (IN718) powder bed fusion to improve surface properties of metallic components, with a finite element method used for simulation and evaluation of different process parameters on surface hydrophobicity.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Shipra Bajpai, Alok Bhadauria, T. Venkateswaran, Sudhanshu S. Singh, Kantesh Balani
Summary: The study employed spark plasma sintering to join two pre-sintered HfB2-ZrB2 and HfB2-ZrB2-SiC composites using Ni powders as an interlayer. Solid-state diffusion of Ni into UHTCs resulted in the formation of continuous and crack-free interfaces. While the HZ/Ni/HZ joint exhibited reduced hardness due to microstructural inhomogeneity, the HZS/Ni/HZS joint achieved uniform hardness owing to microstructural homogeneity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Mao-Yuan Luo, Tu-Ngoc Lam, Pei-Te Wang, Nien-Ti Tsou, Yao-Jen Chang, Rui Feng, Takuro Kawasaki, Stefanus Harjo, Peter K. Liaw, An-Chou Yeh, Soo Yeol Lee, Jayant Jain, E-Wen Huang
Summary: The effect of grain size on the strain-controlled low-cycle fatigue properties of CoCrFeMnNi high-entropy alloys was investigated. It was found that fine-grained alloys exhibited more prominent secondary cyclic hardening behavior compared to coarse-grained alloys. By tuning the grain size, fatigue-resistant high-entropy alloys can be designed.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Shi-Wei Chen, E-Wen Huang, Sung-Mao Chiu, Mark Reid, Cheng-Yen Wu, Anna M. Paradowska, Tu-Ngoc Lam, Yu-Hao Wu, Soo Yeol Lee, Shao-Chien Lu, Shin-An Chen, Yan-Gu Lin, Shih-Chang Weng
Summary: The role of residual stress in machine tools is critical for achieving high accuracy. This research systematically investigated the residual stress in a stress frame of gray iron using synchrotron X-ray and neutron sources. The results shed light on improving the mechanical stability of machine tool materials.
FRONTIERS IN MATERIALS
(2022)
Article
Automation & Control Systems
You Sub Kim, Daeho Yun, Jun Hyun Han, Md. R. U. Ahsan, E-Wen Huang, Jayant Jain, Changwook Ji, Duck Bong Kim, Soo Yeol Lee
Summary: This study presents a bimetallic structure manufactured by gas-metal-arc-welding based on wire-arc additive manufacturing technology. The structure was heat treated for improved mechanical properties, resulting in a microstructural change and enhanced tensile strength. The epitaxial growth at the bimetallic interface and dynamic strain hardening at the interface contributed to the higher hardness observed.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Chetan Singh, Aditya Gokhale, Anand Varma, Sudhanshu Shekhar Singh, Jayant Jain
Summary: The study investigates grain boundary sliding (GBS) as a potential mechanism for enhancing room-temperature ductility of a Mg-0.6Ca binary alloy at lower strain rates. The results reveal that the amount of strain accommodated by GBS increases as the strain rate decreases. The alloy exhibits high strain rate sensitivity, which is attributed to GBS.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
You Sub Kim, Woo Cheol Kim, Jayant Jain, E-Wen Huang, Soo Yeol Lee
Summary: This study analyzed the corrosion failure of a boiler water wall tube and identified overheating by flames as the cause of failure. The study found that the increase in localized temperature caused a change in the microstructure of the tube, making it more brittle. It also identified the development of tensile residual stresses and the formation of cavities or microcracks along grain boundaries as contributing factors. High-temperature hydrogen embrittlement combined with stress corrosion cracking initiated multiple microcracks and resulted in intergranular fracture inside the tube.
Article
Nanoscience & Nanotechnology
Tu-Ngoc Lam, Andrew Lee, Yu-Ray Chiu, Hsuan-Fan Kuo, Takuro Kawasaki, Stefanus Harjo, Jayant Jain, Soo Yeol Lee, E-Wen Huang
Summary: In this study, the authors examined the fine melt pool, coarse melt pool, and heat affected zone in additive manufactured AlSi10Mg alloys and demonstrated that the yield strength can be estimated based on the sizes and volume fractions of these features combined with the second-phase hardening. They also compared the performance of two different alloys and found that the horizontally-built AlSi10Mg alloy exhibited better yield strength, tensile strength, and elongation, as well as the ability to endure high load during plastic deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Ashwani Kumar, Bhagyaraj Jayabalan, Chetan Singh, Jayant Jain, Subrata Mukherjee, Krishanu Biswas, Sudhanshu S. Singh
Summary: In this study, lanthana based oxide dispersion strengthened ferritic steels were fabricated and the effects of chromium content and sintering temperature on the mechanical properties were investigated. The results showed that increasing the chromium content improved the compressive strength and compressive fracture strain of the steel.
METALS AND MATERIALS INTERNATIONAL
(2023)
Editorial Material
Materials Science, Multidisciplinary
L. J. Santodonato, E-Wen Huang, Andreas Kulovits, Peter K. Liaw
FRONTIERS IN MATERIALS
(2022)
Article
Chemistry, Physical
Tu-Ngoc Lam, Kuang-Ming Chen, Cheng-Hao Tsai, Pei- Tsai, Meng-Huang Wu, Ching-Chi Hsu, Jayant Jain, E-Wen Huang
Summary: To mimic bone and reduce the stress shielding effect of metallic biomaterials, porous CoCrMo alloys with different volume porosities were produced via selective laser melting. A heat treatment process was applied to increase the volume fraction of the desired structure. The compressive mechanical properties were investigated and compared with bone tissue.
Review
Nanoscience & Nanotechnology
Poresh Kumar, Tu-Ngoc Lam, Pawan Kumar Tripathi, Sudhanshu Shekhar Singh, Peter K. Liaw, E-Wen Huang
Summary: Recent advancements in high-entropy alloys and high-entropy materials have shown promising potential for various applications. These materials, consisting of five or more elements, exhibit unique properties that can be tuned by proper element selection and manufacturing methods. They offer characteristics such as high thermal stability, creep resistance, high stiffness, and good corrosion resistance, making them sought after for aerospace applications.
Article
Materials Science, Multidisciplinary
Nooruddin Ansari, Dong-Hyun Lee, E-Wen Huang, Jayant Jain, Soo Yeol Lee
Summary: The present study investigates the anisotropic microstructure, nanomechanical, and corrosion behavior of direct energy deposited Ti-13Nb-13Zr biomedical alloys. The study reveals different mechanical behaviors in different planes, with the xy plane showing better indentation hardness and lower strain rate sensitivity compared to the x-z plane. The microstructure of the xy plane is finer, leading to better strength and corrosion resistance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Ceramics
Chih-Yu Lee, Chuanyu Lian, Hongyi Sun, Yi-Siou Huang, Niloy Acharjee, Ichiro Takeuchi, Carlos A. Rios Ocampo
Summary: Chalcogenide phase change materials (PCMs) offer great potential for the Optics and Photonics community, providing nonvolatility and large optical property modulation for devices with low-energy consumption and ultra-compact form factors. Precisely controlling the glassy amorphous and crystalline domains of PCMs is a challenging task, but essential for achieving intermediate optical response and repeatable reconfiguration.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)