Article
Chemistry, Physical
Madhusmita Behera, Ajit Panigrahi, Matthias Bonisch, Gyan Shankar, Pratima Kumari Mishra
Summary: A near-equiatomic TiTaNbMoZr refractory high entropy alloy (RHEA) was prepared by vacuum arc melting, and its structural stability and thermal expansion were investigated. The alloy exhibits structural stability up to 1173K and thermal stability up to 1000K.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Haoliang Wang, Daniel Kuok Zheng Lai, Juping Xu, Wen Yin, Chenghao Song, Yuliang Zhao, Yang Yang, Matthias Bonisch, Zhenzhong Sun
Summary: This article discusses the method of obtaining customized linear thermal expansion by controlling the thermal expansion of cold-worked martensitic titanium alloys, and introduces a new approach to regulate thermal expansion using orthorhombic alpha ''(iso) formed by diffusion. Compared to cold-worked martensitic alloys, this method can achieve a significantly broader temperature range of tailored linear thermal expansion.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Coatings & Films
V. Abhijith Vijay, K. Santhy, G. Sivakumar, B. Rajasekaran
Summary: The paper investigates the effect of temperature on the crystallite size, lattice strain, and coefficient of linear thermal expansion of atmospheric plasma sprayed NiCrAlY coating through in-situ high-temperature X-ray diffraction. Major phases identified include gamma-Ni, gamma'-Ni3Al, beta-NiAl, and alpha-Cr. The study also predicts the equilibrium phases and thermal expansion behavior of the Face Centered Cubic (FCC) and Body Centered Cubic (BCC) phases.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Yaguang Dong, Sai Mu, Xun Guo, Junfeng Han, Junxi Duan, Nannan Jia, Yunfei Xue, Ke Jin
Summary: The transport properties of refractory high-entropy alloys (RHEAs) with body-centered cubic structures are investigated using experiments and first-principles calculations. The measured residual electrical resistivities are high and vary from 35 to 100 mu Omega cm. In contrast to face-centered cubic structures, lattice distortion plays a significant role in determining the transport properties of RHEAs. The temperature dependence of resistivity in RHEAs is smaller compared to 3d-transition metal HEAs at similar resistivity values, and there is a difference in the compositional dependence of thermal and electrical conductivity.
SCRIPTA MATERIALIA
(2023)
Review
Chemistry, Multidisciplinary
Hang Wang, Quanfeng He, Xiang Gao, Yinghui Shang, Wenqing Zhu, Weijiang Zhao, Zhaoqi Chen, Hao Gong, Yong Yang
Summary: Since 2004, the design of high entropy alloys (HEAs) has sparked significant interest in the materials science community due to their exceptional structural and functional properties. By incorporating multiple principal elements into a common lattice, a highly distorted lattice can be created, enabling HEAs to offer a promising combination of mechanical and physical properties that are not typically observed in conventional alloys. This article provides an extensive overview of multifunctional HEAs with severe lattice distortion, including theoretical models, experimental and computational methods, and the impact of lattice distortion on their mechanical, physical, and electrochemical properties. The review aims to stimulate further research into the study of distorted lattices in crystalline solids.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jianyan Yang, Weijun Ren, Xinguo Zhao, Tatsuya Kikuchi, Ping Miao, Kenji Nakajima, Bing Li, Zhidong Zhang
Summary: High-entropy alloys exhibit extensive atomic occupational disorder on high-symmetric lattices, leading to unique magnetic and thermal transport properties. These alloys show complex magnetic behavior, significantly reduced electrical and thermal conductivities compared to traditional alloys, and thermal transport dominated by defect scattering.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Jamil Ur Rahman, Patricia Almeida Carvalho, Nayereh Soltani, Matthias Schrade, Anette Eleonora Gunnaes, Terje G. Finstad
Summary: This paper explores the synthesis of new antimonide compounds based on the concept of high entropy alloys. The thermoelectric transport properties of antimony-based high entropy alloys were studied and compared to cutting-edge half-Heusler thermoelectric alloys. The results showed comparable electrical conductivity, Seebeck coefficient, and thermal conductivity. Different alloys with varying valence electron counts were synthesized and correlated with measured electrical properties.
Article
Materials Science, Multidisciplinary
Dominic Gehring, Yang Ren, Zeina Barghouti, Ibrahim Karaman
Summary: The study focuses on the evolution of crystalline CTE anisotropy, texture, and polycrystalline CTE in TiNb alloys with varying Nb content, temperature, and deformation level. Results showed that Ti76Nb24 alloys exhibited the highest crystalline CTE anisotropy and polycrystalline CTE values, while lower Nb content and increasing deformation level negatively impacted the CTE performance.
Article
Engineering, Chemical
Mahesh Jadhav, Sheela Singh, Meenu Srivastava, Chethan, R. P. S. Chakradhar, Bharat B. Panigrahi
Summary: The effect of Ti-0.1 and Ti0.1Si0.1 addition on the high temperature isothermal oxidation behavior of FeCoCrNiAl and (FeCoCrNiAl)-Al-2 high entropy alloy was investigated. The results showed that the addition of Ti and Si can improve the mechanical properties and oxidation resistance of the alloy.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yulin Qin, Yipeng Wang, Shixue Guan, Chuqi Wang, Bo Jiang, Wenqiang Wang, Mengyang Huang, Bo Peng, Qingze Li, Fang Peng, Zili Kou
Summary: The microstructure and mechanical properties of CoCrFeNiMo0.4 high-entropy alloys (HEAs) were influenced by pressure and holding time during synthesis. The increased pressure hindered the diffusion between atoms, while Fe atoms diffusion was promoted with increased holding time. The synergistic effects of solid-solution strengthening and lattice distortion caused by large Mo atoms and high pressure were the dominant mechanisms for the enhanced microhardness of sintered HEAs under extreme conditions.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Chemistry, Physical
N. Manjunath, K. Santhy, B. Rajasekaran
Summary: A new approach using in-situ high-temperature X-ray diffraction (HT-XRD) was adopted to evaluate thermal mismatch induced by thermal expansion in substrate-coating contact pairs. The study investigated an atmospheric plasma sprayed (APS) Mn1.0Co1.9Fe0.1O4 (MCF) coating on Crofer 22 APU steel interconnect. In-situ HT-XRD was performed for both the substrate and coating from 25°C to 900°C, recording diffraction data to obtain lattice parameters and strain as a function of temperature. The findings showed that the coefficient of thermal expansion (CTE) of the MCF coating was slightly higher than the steel substrate, with no significant thermal expansion mismatch observed until 700°C. The increasing lattice strain indicated a strain-induced phase transformation of the MCF coating with temperature, supporting the self-healing phenomenon. The study discussed the merits of in-situ HT-XRD as a tool for optimizing operating temperature and measuring thermal mismatch in solid oxide fuel cell (SOFC) stacks.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Somnath Acharya, Junphil Hwang, Kwangrae Kim, Jungwon Kim, Woohyun Hwang, Aloysius Soon, Woochul Kim
Summary: This study reveals the quasi-random distribution of distorted nanostructures (QDDN) in high-entropy materials as the key factor for their superior thermoelectric properties. The QDDN exhibits nanoscale disorder, causing a high level of lattice-strain-induced distortion. Theoretical analysis confirms that the QDDN leads to strong phonon scattering throughout the phonon spectrum. An enhancement of 132% in zT was achieved by utilizing the QDDN in a Cu0.8Ag0.2[-Ga0.8In0.2]0.99Zn0.01Te2 compound compared to pure CuGaTe2. These findings contribute to the understanding and further improvement of thermoelectric materials.
Article
Materials Science, Multidisciplinary
Yasar Orbay, Ziyuan Rao, Asli Cakir, Tolga Tavsanoglu, Michael Farle, Mehmet Acet
Summary: In this research, the FCC-BCC phase transition in (MnFeCoNi)80Cu20- Al, Ga high entropy alloys was investigated, and the structural, magnetic, hardness, and thermal expansion properties were studied. It was found that the addition of Al (10 at%) and Ga (15 at%) resulted in the emergence of BCC structure and ferromagnetic interactions. The investigated high entropy alloys obey the Slater-Pauling rule in terms of valence electron concentration and average magnetic moment values, and exhibit similar properties to Heusler alloys.
Article
Materials Science, Multidisciplinary
Jing Tang, Cheng Qin, Hulei Yu, Zezhu Zeng, Lixun Cheng, Binghui Ge, Yue Chen, Wen Li, Yanzhong Pei
Summary: This study focuses on the potential thermoelectric applications of BaAg2Te2, a compound with a Pnma crystal structure that exhibits a remarkably low lattice thermal conductivity. By alloying with Cu at the Ag site, the carrier concentration can be increased and the thermal conductivity can be reduced, leading to enhanced thermoelectric performance.
MATERIALS TODAY PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
D. Foster, M. Paladugu, J. Hughes, M. Kapousidou, U. Islam, A. Stark, N. Schell, E. Jimenez-Melero
Summary: The microstructural evolution and dimensional changes of high-carbon SAE 52100 bearing steel during austempering and tempering were investigated using high-energy X-ray diffraction and in-situ dilatometry. The results showed that the transformation from austenite to bainitic ferrite induced lattice defects and internal lattice stresses, which increased with longer austempering time and lower austempering temperatures. The lattice parameter of bainitic ferrite reached its highest value in the early stages of austempering and gradually decreased as the transformation progressed, indicating an initial state of carbon supersaturation in the ferritic lattice. Carbon partitioning into the austenite phase was observed at higher austempering temperatures. The dimensions of the bearing steel specimens were influenced by the volume change during the formation of bainitic ferrite during austempering and the relaxation of lattice distortion during tempering.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
Deepak Davis, Shezan Saleem, Farhaan Shah, Sheela Singh
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2020)
Article
Chemistry, Physical
Mahesh Jadhav, Sheela Singh, Meenu Srivastava, G. S. Vinod Kumar
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Materials Science, Multidisciplinary
Deepak Davis, Sheela Singh, Meenu Srivastava
Article
Materials Science, Coatings & Films
Deepak Davis, Sheela Singh, R. P. S. Chakradhar, Meenu Srivastava
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2020)
Article
Chemistry, Multidisciplinary
Deepak Davis, Gobinath Marappan, Yuvaraj Sivalingam, Bharat B. Panigrahi, Sheela Singh
Article
Metallurgy & Metallurgical Engineering
Disna Sahane, Sheela Singh, Mahesh Jadhav, Bharat B. Panigrahi
Summary: The sintering kinetics of non-equiatomic Fe2CoCrMnNi HEA have not been previously reported, but this study investigated the sintering behavior and mechanism of this alloy through dilatometric measurements, revealing grain boundary diffusion as the dominating sintering mechanism.
Article
Engineering, Chemical
Mahesh Jadhav, Sheela Singh, Meenu Srivastava, Chethan, R. P. S. Chakradhar, Bharat B. Panigrahi
Summary: The effect of Ti-0.1 and Ti0.1Si0.1 addition on the high temperature isothermal oxidation behavior of FeCoCrNiAl and (FeCoCrNiAl)-Al-2 high entropy alloy was investigated. The results showed that the addition of Ti and Si can improve the mechanical properties and oxidation resistance of the alloy.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Hari Prasanth Perumal, Mahesh Jadhav, E. Meher Abhinav, Jaivardhan Sinha, Sheela Singh
Summary: This study investigates the effect of increasing concentration of antiferromagnetic element Cr in FeCoCrxNi2Al (x = 0.5, 1.5) high entropy alloy (HEA) on their magnetic properties. The structure and composition of different phases in the HEA significantly influence its magnetic properties, with the sample containing Cr concentration x = 1.5 showing twice the saturation magnetization compared to x = 0.5. Additionally, the magnetization versus temperature response exhibits multi-phase characteristics and distinct behavior in both low temperature and high temperature regimes. The obtained soft ferromagnetic behavior of these HEAs is crucial for the development of a new class of alloys for various applications.
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Meenu Srivastava, Mahesh S. Jadhav, Chethan, R. P. S. Chakradhar, Sheela Singh
Summary: The present study investigates the application of non-stoichiometric Al1.4Co2.1Cr0.7Ni2.45Si0.2Ti0.14 high entropy alloy as a bond coat material in the thermal barrier coating (TBC) system. The properties and performance of the TBC system containing the high entropy alloy were evaluated and compared with a conventional TBC system. The results show that the TBC system with the high entropy alloy exhibits exceptional high temperature properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Chemical
Yongxiang Wu, Nguyen Thi Hong Nhung, Deqian Zeng, Nengneng Luo, Akira Otsuki, Gjergj Dodbiba, Toyohisa Fujita
Summary: This study proposed a novel method for synthesizing flower-like vaterite calcium carbonate using nanobubble-containing ethanol and water mixed solution as the solvent and discussed the formation mechanism of vaterite with different shapes. The synthesized vaterite has significant practical interest in the integrated treatment of wastewater contaminated by heavy metals with effective Cd(II) removal, providing a promising field for studying heavy metal and pollutant adsorption in the liquid phase.
ADVANCED POWDER TECHNOLOGY
(2024)
Article
Engineering, Chemical
Jian Gong, Lipo Cheng, Ming Liu, Jie Jiang, Xiaoduo Ou
Summary: This study investigates the effects of particle shape on the collapse of granular columns using the discrete element method. The results show that particle shape has a significant impact on deposition morphology, energy evolution, and mechanical coordination number. Sphericity and angularity are identified as the most important macroscale factors, while roughness has a weaker microscale influence.
ADVANCED POWDER TECHNOLOGY
(2024)