Article
Materials Science, Multidisciplinary
Qingwei Guo, Hua Hou, Yue Pan, Xiaolong Pei, Zhuo Song, Peter K. Liaw, Yuhong Zhao
Summary: This study investigates the structural transformation and strain localization of Al0.3CoCrFeNi high-entropy alloy during nanoindentation using molecular dynamics, and discusses the hardening-softening mechanism. The simulations reveal the discovery of a prismatic dislocation loop with independent nucleation in the [111] orientation for the first time. Dislocation multiplication and cross-slip lead to work hardening, while free dislocation slip and annihilation cause plastic softening. Twin boundaries contribute to hardening but can also cause softening effects in the later stage of plastic deformation due to the formation of steps and local damage zones.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Siyao Xie, Jiuxing Zhang, Ruidi Li, Tiechui Yuan, Mei Zhang, Minbo Wang, Zhijian Zhang, Shenghua Deng, Qin Li
Summary: Electric current assisted annealing can accelerate the precipitation of B-2 particles in high-entropy alloys, reduce the required annealing time, and enhance the ultimate tensile strength and hardness of the material.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Ceramics
Jie Sun, Yu Lei, Wei Fu, Danyang Lin, Shengpeng Hu, Xiaoguo Song, Jian Cao, Minxuan Yang
Summary: This study successfully achieved reliable brazing of SiC ceramic to Al0.3CoCrFeNi high-entropy alloy using inactive AgCu filler and investigated the influence of interfacial microstructure and brazing temperature on the joint properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Jinlong Zhang, Risheng Qiu, Xinu Tan, Xuantong Quan, Bo Song, Qing Liu
Summary: The effects of deformation and annealing on the precipitation behaviors and structural features of L1(2), B2, BCC, and sigma phases in Al0.3CoCrFeNi high entropy alloy were analyzed. The precipitation pathways were controlled by thermodynamic factors in as-cast alloys, leading to homogeneous L1(2) precipitation under low annealing temperature and B2 precipitation under high annealing temperature. However, deformation before annealing changed the precipitation pathway to B2, BCC, and sigma phases due to a combination of thermodynamic and kinetic conditions. The reciprocal promotion of precipitation behaviors by B2 and sigma phases was observed.
Article
Chemistry, Physical
Xiaodi Wang, Zhe Zhang, Zhengbin Wang, Xuechong Ren
Summary: Through thermo-mechanical processing, it was found that a shorter annealing time can enhance the hardness of the Al0.3CoCrFeNi alloy, achieving higher mechanical properties. The excellent combination of strength and ductility in the alloy is mainly attributed to the combined action of multiple strengthening mechanisms.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Z. J. Shi, Z. B. Wang, X. D. Wang, S. Zhang, Y. G. Zheng
Summary: The corrosion resistance of Al-Co-Cr-Fe-Ni high entropy alloys (HEAs) is affected by B2 phases, which lead to easier pit initiation and propagation, as evidenced by microstructure characterization and electrochemical measurements. The detrimental effect of B2 phases on the corrosion resistance of Al0.3CoCrFeNi HEAs is confirmed in this study.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Jun Wang, Hongchao Li, Haoxue Yang, Yu Zhang, William Yi Wang, Jinshan Li
Summary: The study found that hot deformation and heat treatment can alter the microstructure and hardness of high-entropy alloys, with high deformation temperature inducing dynamic recrystallization. Partial and complete recrystallization can occur after annealing, with a decrease in hardness related to the processes of dynamic recrystallization and recovery.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Qian Wang, Bing Wang, Weifeng Yuan, Bin Gu
Summary: The elastic-plastic deformation behavior and plastic deformation mechanisms of single crystal Al0.3CoCrFeNi high-entropy alloy under nanoindentation are investigated. The nucleation and growth of Shockley partial dislocations and stacking faults are the main mechanisms for plastic deformation, and the release of dislocation loops under further dislocation reactions becomes a new mechanism.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Zerui Sun, Changgen Shi, Li Gao, Sunlang Lin, Wenxuan Li
Summary: In high entropy alloys, the nanoscale precipitations and short-range orders greatly impact the material's mechanical properties and thermal physical properties. Experimental and simulation results showed that the intragranular segregation and ordering in the as-cast high entropy alloy have significant effects on its resistivity, thermal conductivity, and specific heat capacity. The alloy undergoes an order-disorder transition and phase decomposition during the heating process. Phonons play a dominant role in heat conduction. The temperature dependence of thermal conductivity and lattice thermal conductivity is observed. The experimental results are affected by intragranular segregation and ordering, showing differences with the simulation results at lower temperatures but good agreement at higher temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Haoping Peng, Siyao Xie, Pengda Niu, Zhijian Zhang, Tiechui Yuan, Zhiqiang Ren, Xiaoming Wang, Yang Zhao, Ruidi Li
Summary: Al0.3CoCrFeNi high-entropy alloy was additively manufactured by laser melting deposition, and its microstructure and tensile properties were studied. Thermal stress induced dislocation loops and cracks, leading to poor ductility in the samples, while annealing facilitated further precipitation of phases introducing hardening effects.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Yanni Zhao, Zhongwei Chen, Kang Yan, Wei Le, Sufyan Naseem, Haolan Zhang, Lanlan Yang
Summary: In this study, the effects of different annealing temperatures on the microstructure, grain boundary evolution, and mechanical properties of cryo-rolled Al0.3CoCrFeNi alloys were systematically investigated. A partial recrystallization was achieved at specific annealing temperatures, contributing to the improvement of nucleation rate and hindrance of grain growth. The cryo-rolled Al0.3CoCrFeNi alloy annealed at 1123 K exhibited a remarkable combination of strength and ductility, mainly due to back stress and grain size contributions. Furthermore, the FCC -> 9R phase -> twin transformation was observed in the cryo-rolled Al0.3CoCrFeNi HEA annealed at 1473 K, which explained its outstanding ductility and strain hardening ability.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Jamieson Brechtl, Rui Feng, Peter K. Liaw, Benoit Beausir, Hafsa Jaber, Tatiana Lebedkina, Mikhail Lebyodkin
Summary: This study explores the mesoscale complexity of macroscopically smooth plastic flow and reveals transitions between different dynamical regimes in the deformation behavior of high-entropy alloys (HEAs). The findings provide significant new insights into the micro/macro transition in HEAs.
Article
Nanoscience & Nanotechnology
Yao Lu, Kai Zhang, Bingbing Zhao, Xianping Dong, Lanting Zhang
Summary: In this study, two high-entropy alloys were designed to explore the possibility of replacing expensive Co with Ni. The aging treatment at different temperatures showed that both alloys exhibited a good balance of strength and ductility at room temperature. The Al0.3CrFeNi2 alloy showed higher yield strength and lower elongation compared to the Al0.3CoCrFeNi alloy after aging at 550 degrees C. The difference in mechanical properties can be attributed to the volume fraction difference of L12 and M23C6 phases in the two alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Zerui Sun, Changgen Shi, Cuixia Liu, Hang Shi, Jie Zhou
Summary: Recent studies show that atoms in high entropy alloys (HEAs) are not randomly distributed, but exhibit a certain short-range order (SRO). However, the effect of SRO on the properties of Al0.3CoCrFeNi is not well-studied. In this paper, molecular dynamics (MD) simulations were conducted to investigate the effect of SRO on the mechanical properties of Al0.3CoCrFeNi. The results suggest that SRO inhibits the propagation of stacking faults (SFs), enhances dislocation storage capacity, and promotes the formation of deformation twins.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Yihang Fang, Lingqin Xia, Guang Chen, Tao Wu, Ruiquan Wang, Xiang Yu, Kaimin Chen, Mengxian Zhang, Xianrui Zhao, Hu Cheng
Summary: In this study, a high-performance Ti(C,N)-based cermet was prepared and the effects of ZrO2 whiskers and HEA on the material properties were investigated. The results showed that ZrO2 whiskers and HEA can improve the high-temperature properties of the cermet material.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Rahul Bhattacharya, Murugesan Annasamy, Pavel Cizek, M. Kamaraj, G. Mohan Muralikrishna, Peter Hodgson, Daniel Fabijanic, B. S. Murty
Summary: Nanocrystalline AlxCoCrFeNi high-entropy alloys were synthesized using mechanical alloying (MA) and consolidated by spark plasma sintering (SPS). The composition and microstructure of the alloys were affected by the Al content and the addition of carbon and oxygen during the milling process, resulting in nanoscale dispersion of carbides and oxides.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
J. Joseph, M. Annasamy, S. R. Kada, P. D. Hodgson, M. R. Barnett, D. M. Fabijanic
Summary: This study analyzed the effect of the relative contents of Al and Ti on the equilibrium phase formation in a novel high entropy superalloy system. Lower Al/Ti ratio improved the mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Hossein Beladi, Ehsan Farabi, Peter D. Hodgson, Matthew R. Barnett, Gregory S. Rohrer, Daniel Fabijanic
Summary: Solid-state additive friction stir deposition was used for three-dimensional printing of 316L stainless steel. The resulting microstructure was exceptionally fine, with a significantly different misorientation angle distribution from the original material, and a texture showing strong shear components.
PHILOSOPHICAL MAGAZINE
(2022)
Article
Materials Science, Ceramics
Tripta Parida, Anirudha Karati, Soumyaranjan Mishra, Karthiga Parthiban, Kirthiga Parthiban, B. S. Murty
Summary: A novel multicomponent perovskite was synthesized by substituting 5 cations in the A-site of BaTiO3 lattice. The compound underwent 5 hours of ball milling, followed by annealing at 800 degrees C for 2 hours, and then sintered at 1200 degrees C for 2 hours to form the cubic perovskite phase. The band gap of the compound was found to be 2.94 eV with a dielectric constant value of 270.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Anirudha Karati, Sanyukta Ghosh, M. Nagini, Ramesh Chandra Mallik, Rajashekhara Shabadi, B. S. Murty, U. V. Varadaraju
Summary: In this study, nanocrystalline Ti2NiCoSn1-xSb1+x(x = 0.3, 0.5, 0.7, 1) alloys were successfully synthesized using the powder metallurgy route. The homogeneous distribution of elements in the half-Heusler phase at a scale of few nanometers was confirmed by atom probe analysis. A combination of nanostructuring, lattice distortion, and interfacial scattering resulted in a reduction in thermal conductivity and an improvement in thermoelectric efficiency.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Priyesh Paremmal, Anirudha Karati, Ritu Das, R. Seshadri, H. Raghothaman, S. Loganathan, M. S. Ramachandra Rao, B. S. Murty
Summary: This study demonstrates the tight composition control of sputtered TiZr-Cu-Ni-Al thin film metallic glasses (TFMGs) using a spark plasma sintered multicomponent target. The research investigates the structural and nanoscratch properties of TFMGs and optimizes their nano scratch resistance by tuning the radio frequency (RF) power and argon (Ar) pressure. The study provides insight into the scratch mechanism and suggests guidelines for developing TFMGs as scratch-resistant protective coatings.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Multidisciplinary
Jyoti Gupta, Dibakar Das, Anirudha Karati, Joydip Joardar, Pramod H. Borse
Summary: Nanostructured MoS2 synthesized hydrothermally was immobilized on graphite paper to create an electrode for hydrogen evolution. Through chemical optimization and characterization, it was found that the optimized MoS2 exhibited higher electrocatalytic stability and hydrogen production rate.
Article
Nanoscience & Nanotechnology
Anirudha Karati, Simanta Lahkar, Yixuan Hu, Ramkrishna Sahoo, Harish Kumar Adigilli, Neha Y. Hebalkar, Kolan Madhav Reddy, Joydip Joardar
Summary: In this study, a Cu-Mo-S mixed chalcogenide was synthesized using wet chemical synthesis. The compound exhibited nanocube-like morphology with a size range of 30-50 nm. Investigation on its phase formation and pseudocapacitive properties revealed a ternary phase that does not match with any reported structure. Extensive analysis using high-resolution transmission electron microscopy and energy-dispersive X-ray spectroscopy confirmed the physical structure and chemical composition of the compound.
ACS APPLIED NANO MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
B. Bian, S. Taheriniya, G. Mohan Muralikrishna, A. Godha, S. K. Makineni, S. Sankaran, B. B. Straumal, Y. Du, G. Wilde, S. V. Divinski
Summary: Kinetic and structural changes induced by Bi alloying in dilute Ni-Bi alloys were investigated, focusing on grain boundary phase transitions. The grain boundary diffusion of Ni in the Ni-Bi alloys was measured across single and two-phase regions of the bulk phase diagram. The results showed that the Ni grain boundary diffusion rates were dependent on the Bi concentration and were influenced by Bi segregation and multi-layer Bi segregation along the grain boundaries. The presence of a liquid layer of Bi at the grain boundaries resulted in the highest Ni diffusivity. Additionally, structural transitions between different grain boundary phases were found to have a significant impact on the grain boundary diffusion rates.
Article
Materials Science, Multidisciplinary
Rahul John, K. Guruvidyathri, B. S. Murty, Daniel Fabijanic
Summary: This study investigates the thermal stability, precipitation, and mechanical behavior of near eutectic high-entropy alloy. The alloy solidifies as FCC and undergoes sequential ordering to L1(2) with a transition temperature between 700°C and 1000°C. The eutectic morphology (L1(2) and B2) is defined by cooling rate, variation in the concentration boundary layer, thermal gradient, and interfacial energy. Thermal exposure results in homogeneous precipitation of Al-Ni-rich B2 phase within the proeutectic and irregular eutectic regions. B2 precipitation during heat treatment enhances the mechanical behavior of the alloy, but the as-cast alloy has a superior work hardening rate.
Article
Metallurgy & Metallurgical Engineering
Devara Srinu, Yasam Palguna, G. M. Muralikrishna, Rajesh Korala, K. Srinivasa Rao, N. R. M. R. Bharagava
Summary: The influence of B2 aluminide particulate reinforcement on the mechanical properties of pure aluminium was investigated for the first time. Aluminum metal matrix composites were synthesized using mechanical stirring. The microstructure of the composites showed a uniform dispersion of B2-Aluminide particles. The addition of 5 wt% B2-aluminide (Al-Co) reinforcement significantly improved the yield strength and ultimate tensile strength by 27% and 16% respectively.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2023)
Article
Nanoscience & Nanotechnology
Riddhi Sarkar, Bo Chen, Michael E. Fitzpatrick, Tim Hilditch, Daniel Fabijanic
Summary: This study reports on the adoption of TiB2 as an inoculant in the fabrication of IN718 through the direct energy deposition (DED) process. Effective grain refinement and low texture were achieved in the IN718/TiB2 samples with specific TiB2 powder size and mass fraction. Deposits made with low linear energy density were free from large grains, but had interlayer defects. Production of deposits without interlayer defects was possible by reducing the powder flow rate, although this resulted in a moderate increase in grain size. The addition of TiB2 as an inoculant reduced the Laves phase network and increased the tensile strength of IN718, but reduced its ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Charline Le Nue, Santiago Corujeira Gallo, Alireza Vahid, Jiangting Wang, Mehdi Taherishargh, Hooyar Attar, Daniel Fabijanic, Matthew Barnett
Summary: High-chromium cast irons are commonly used for wear-resistant applications, and there is ongoing debate on the secondary carbide types during heat treatment. This study examines the microstructural evolution of a hypoeutectic high-chromium cast iron and finds that M23C6 secondary carbides precipitate during heating, while higher temperatures result in the formation of both M23C6 and M7C3 secondary carbides. The carbon content of the matrix plays a significant role in determining the martensite start temperature and bulk hardness.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Review
Green & Sustainable Science & Technology
John Ormerod, Anirudha Karati, Ajay Pal Singh Baghel, Denis Prodius, Ikenna C. Nlebedim
Summary: This paper discusses the wide range of applications for permanent magnets and the different types of commercial permanent magnet materials. It predicts the growth of Nd-Fe-B magnets and addresses the issue of rare earth element scarcity. Additionally, it presents the sourcing, processing, and recycling technologies for rare earth elements.
Article
Engineering, Manufacturing
Ehsan Farabi, Steven Babaniaris, Matthew R. Barnett, Daniel M. Fabijanic
Summary: The additive friction stir deposition (AFSD) of Ti6Al4V alloy was performed successfully with improved ductility and strength of the deposited state, achieved by the reduction of deposition temperature and refinement of the as-deposited phase structure.
ADDITIVE MANUFACTURING LETTERS
(2022)
