Article
Chemistry, Multidisciplinary
Eric Lang, Kory Burns, Yongqiang Wang, Paul G. Kotula, Andrew B. Kustas, Sal Rodriguez, Assel Aitkaliyeva, Khalid Hattar
Summary: High-Entropy Alloys (HEAs) are proposed as materials for extreme environments, but the effects of radiation on their performance are not well understood. In this study, the response of additively manufactured refractory high-entropy alloys (RHEAs) to helium ion bombardment is investigated, revealing the interplay between alloy composition and helium bubble size and density.
Article
Chemistry, Physical
Witold Kucza
Summary: Studies on high entropy or multi-principal element alloys have shown that high stability compositions are dominated by the contents of Ti, Al, or Ni, with minor amounts of the other elements. The selective preferences in compositions are reflected in high deviations between high stability compositions and equimolar ones, with an average reaching 48% for ternary systems to 105% for 7-component alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
Francoise Damay, Jonas Sottmann, Francois Fauth, Emmanuelle Suard, Antoine Maignan, Christine Martin
Summary: In this study, spin-driven multiferroicity was reported above 100K in Cu2CrBO5, with spontaneous polarization reaching 35 mu Cm-2 at 5K. The high transition temperature observed in Cu2CrBO5 is attributed to the strong Cu-O-Cu magnetic super-exchange interactions present in the material. This contribution provides insight into high temperature spin-driven multiferroics among low-dimensional cuprates.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Yokasundery Muniandy, Mengwei He, Mehdi Eizadjou, Easo P. George, Jamie J. Kruzic, Simon P. Ringer, Bernd Gludovatz
Summary: Single phase high-entropy alloys may not always be random solid solutions with homogeneous elemental distributions, as their atomic arrangements and chemical homogeneity can depend on processing history. Electron probe microanalysis (EPMA) and atomprobe tomography (APT) were used to study CrMnFeCoNi HEAs with different processing histories. The study found nanoscale compositional heterogeneities in addition to microscale heterogeneities, showing a combination of EPMA and APT techniques can reliably identify chemical heterogeneities across nanometer to micrometer length scales.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Zhidong Leong, Upadrasta Ramamurty, Teck Leong Tan
Summary: This study conducted a high-throughput first-principles investigation of the microstructures of MPEAs, uncovering the governing principles and presenting a quantitative expression for predicting solid solution formation. The results reproduced microstructural observations from experiments and provided predictions for unexplored regions, offering simple yet powerful design principles for future experiments to rationally design MPEAs.
Article
Materials Science, Multidisciplinary
J. Cieslak, M. Calvo-Dahlborg, K. Berent, U. Dahlborg
Summary: The investigation of FeCoNiPdx and CrxFeCoNiPd high entropy alloys showed that increasing Pd content in FeCoNiPdx samples only slightly influenced the Mössbauer spectra, while increasing Cr content in CrxFeCoNiPd samples resulted in a strong decrease in hyperfine field intensity. Decomposing the HEAs compositions into binary artificial Fe-dopant systems helped interpret the magnetic structure of the two series studied.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Physical
Ruiyi Zheng, Zhongyuan Wu, Mengya Chen, Bin Li, Yong Yang, Zhong Li, Xiaohua Tan, Hui Xu
Summary: This study investigates the AC magnetic properties and microstructure of FeCoNi1+xCu1-xAl high-entropy alloys. The results indicate that adjusting the amounts of Ni and Cu can improve the total loss, AC coercivity, and AC applied field of the alloy. Specifically, when x = 0.1, the performance decreases by 40% to 43% at 50 Hz, while x = 0.7 exhibits optimized magnetic properties. The study also reveals the dominant loss mechanisms at different frequencies and the changes in microstructures with FCC and BCC phases in the alloy. This research provides valuable insights for exploring novel soft magnetic materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Yujie Chen, Yan Fang, Ruixin Wang, Qian Yu, Shuxin Bai, Yu Tang
Summary: The compositional heterogeneity in high-entropy alloys plays an important role in altering the mechanical properties of materials. By tuning the variation of lattice resistance for dislocation motion, researchers have successfully improved both the strength and ductility of a special high-entropy alloy with a spinodal decomposition structure.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Wojciech Lonski, Monika Spilka, Mariola Kadziolka-Gawel, Piotr Gebara, Adrian Radon, Tymon Warski, Katarzyna Mlynarek-Zak, Rafal Babilas
Summary: High entropy alloys with variable silicon content were prepared by two different methods to investigate the influence of cooling rate and chemical composition on their structure and properties. The results showed that increasing silicon content led to a decrease in saturation magnetization, and rapidly cooled plates exhibited the lowest coercive force. The AlCoCrFeNiSi0.75 alloy in plate form exhibited the highest corrosion resistance in a 3.5% NaCl solution, and the addition of Si increased the hardness of the ingots and plates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
A. Jelen, P. Kozelj, D. Gacnik, S. Vrtnik, M. Krnel, G. Drazic, M. Wencka, Z. Jaglicic, M. Feuerbacher, J. Dolinsek
Summary: The single-crystalline FeCoCrMnAl nanocomposite high-entropy alloy consists of crystallographically oriented magnetic nanoplatelets embedded in a magnetic matrix. Upon cooling, a collective disordered ferromagnetic state is developed due to the exchange coupling between the nanoplatelets and the matrix, making the material promising for magnetocaloric refrigeration applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Haitao Zhang, Chenglin Wang, Shuyan Shi, Tingju Li, Longjiang Zou, Yiping Lu, Peter K. Liaw
Summary: This study demonstrates for the first time the effect of interstitial boron and boron-rich precipitate on the deformation mechanisms of FCC high-entropy alloys. Introducing interstitial boron atoms can transform the dominant deformation mechanism from dislocation slip to deformation twins, while the formation of borides leads to a reversion to dislocation slip.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
J. L. Yuan, Y. C. Wu, P. K. Liaw, J. H. Luan, Z. B. Jiao, J. Li, P. D. Han, J. W. Qiao
Summary: By tuning the microstructures of the nano-precipitated alloy, different types of precipitates with various morphologies and volume fractions can be obtained. The interaction between the precipitates and dislocations plays a crucial role in achieving a combination of excellent strength and plasticity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
N. Wang, R. K. Nutor, Y. X. Li, Q. P. Cao, S. Q. Ding, X. D. Wang, D. X. Zhang, J. Z. Jiang
Summary: In this work, the ductility-strength trade-off of single-phase FCC high entropy alloys (HEAs) was addressed by tuning the constituent and chemical composition. Flash electro-pulsing treatments at different voltages were used to anneal non-equiatomic (Co40Fe25Cr20Ni15)95Al5 HEAs, resulting in the incorporation of deformation twining during plastic deformation. The annealed samples showed improved tensile strength and ductility, and the method was also applied to another Fe50Mn27Ni10Cr13 alloy, demonstrating its universality. This work provides a fast-effective method to tune the mechanical properties of HEAs and has potential for future industrial applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Jingbo Qiao, Hongmin Zhang, Haoyan Meng, Fanchao Meng, Yang Tong, Daiyi Chao, Peter K. K. Liaw, Shuying Chen
Summary: The equiatomic high entropy alloy NiCoCrFePd exhibits a single face-centered cubic phase with strong lattice distortion due to atomic size mismatch. The effects of chemical composition on grain growth kinetics and solid solution hardening were investigated using a series of equiatomic alloys made from the constituent elements of NiCoCrFePd, including binary alloys and medium entropy alloys. The number and type of alloying elements played a critical role in grain growth and hardness, with the type of constituent elements being more influential. The strength of these alloys depended on the combination of atomic size, modulus mismatch, and electronegativity difference.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Hannah Lange, Sergiy Mankovsky, Svitlana Polesya, Markus Weissenhofer, Ulrich Nowak, Hubert Ebert
Summary: Recently, there has been a lot of attention on the interplay between spin and lattice degrees of freedom due to its importance in various phenomena and applications. This work provides a systematic analysis of spin-lattice interactions in different magnetic materials and focuses on the role of lattice symmetries and dimensions, magnetic order, and the relevance of spin-lattice interactions for angular momentum transfer and magnetic frustration. The authors use a recently developed scheme and an embedded cluster approach to efficiently calculate spin-lattice interaction tensors and benchmark the performance of the scheme.
Article
Physics, Condensed Matter
Caroline S. Gorham, David E. Laughlin
JOURNAL OF PHYSICS-CONDENSED MATTER
(2019)
Article
Materials Science, Multidisciplinary
David E. Laughlin
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2019)
Article
Engineering, Electrical & Electronic
M. Nazmunnahar, S. Simizu, P. R. Ohodnicki, S. Bhattacharya, M. E. McHenry
IEEE TRANSACTIONS ON MAGNETICS
(2019)
Review
Materials Science, Multidisciplinary
Alice E. Perrin, Christopher A. Schuh
Summary: Processing of nanocrystalline metals focuses on generating many grain boundaries with excess defect energy, while stabilizing nanocrystalline alloys aims at lowering this excess energy through grain boundary segregation. There is a need for further research at the intersection of these two fields as stabilized nanocrystalline alloys become increasingly adopted in technology.
ANNUAL REVIEW OF MATERIALS RESEARCH, VOL 51, 2021
(2021)
Article
Physics, Applied
Bing Zhou, David E. Laughlin, Jian-gang (jimmy) Zhu
Summary: This study introduces a new FePt-BN/FePt-SiOx dual-layer granular media with excellent magnetic properties and a higher areal density of FePt grains for heat-assisted magnetic recording. The transmission electron microscopy study reveals well-isolated FePt grains encircled by defined grain boundaries in the fully grown film, which also demonstrates comparable hysteresis characteristics to conventional FePt-C-SiOx granular media.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Alice Perrin, Scott McCall, Michael McElfresh, David E. Laughlin, Michael E. McHenry
Summary: The study reports the pressure-dependent Curie temperature variations in the FeCoNiCuMn high entropy alloy, analyzing them in terms of d-orbital contraction to explain changes in magnetic exchange interactions. Experimental data indicates that the contraction of d-orbitals with pressure primarily influences the variation in Curie temperature of the alloy.
JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION
(2021)
Article
Materials Science, Multidisciplinary
Monica Sorescu, Lucian Diamandescu, Mihaela Sofronie, Canyon Pratt, Jordan Jubeck
Summary: Magnetic ceramic nanoparticles system xNd(2)O(3)-(1-x)alpha-Fe2O3 (x = 0.1, 0.3 and 0.5) was synthesized by mechanochemical activation and characterized by XRD and Mossbauer spectroscopy. Neodymium orthoferrite with a particle size of about 22 nm was successfully produced, and the particle size reduction was observed due to the ball milling process.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Alice Perrin, Sumit Bahl, Donovan N. Leonard, Richard Michi, Kevin Sisco, Alex Plotkowski, Amit Shyam, Ryan Dehoff, Dongwon Shin, Ying Yang
Summary: This study compares AM and conventionally cast Al-Cu-Ce alloys and finds that despite the refined microstructure of the AM alloys, the formation and stability of phases are consistent with the cast alloys. The study also resolves inconsistencies in the previous descriptions of the Al-Cu-Ce alloy phase diagram and adds Al8Cu3Ce as an equilibrium phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Tianxiang Du, David E. E. Laughlin, James A. A. Bain, Wenyi Zhang, Jian-Gang (Jimmy) Zhu
Summary: In this paper, a novel near field transducer (NFT) design concept for heat assisted recording is presented. The design utilizes metal bars separated by thin dielectric to form a resonance plasmonic grating with distributed feedback (DFB). The performance analysis of the novel NFT with a nanocomposite structure is simulated using COMSOL Multiphysics software.
Article
Chemistry, Physical
Alice E. Perrin, Richard A. Michi, Donovan N. Leonard, Kevin D. Sisco, Alex J. Plotkowski, Amit Shyam, Jonathan D. Poplawsky, Lawrence F. Allard Jr, Ying Yang
Summary: Microstructural analysis of AM Al-Ce-Ni-Mn alloys revealed unexpected phases, possibly due to non-equilibrium processing conditions or phase stability change caused by Mn addition. Phase analysis of cast samples showed that Mn significantly altered the liquidus projection, suppressing Al3Ni in favor of Al23Ni6(Ce,Mn)4 and promoting Al20Mn2Ce and Al10Mn2Ce phases. The data improved CALPHAD modeling of the quaternary system and confirmed that the phases in AM Al-Ce-Ni with Mn were consistent with cast samples. This study demonstrates the potential for secondary alloying elements to drastically alter phase stability and microstructure in alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Yannick Naunheim, Alice Perrin, Christian E. Oliver, Katherine Stone, Christopher A. Schuh
Summary: Nano-phase separating Ni-12 at. pct Ag powders were processed to a supersaturated state through high-energy ball milling, inducing nanocrystalline scale grain size reduction to promote rapid densification by phase separation upon heating. However, excessive pore evolution and significant macroscopic swelling were observed during the debinding process, caused by removal of the organic process additives. This study highlights the need to select alloys that have their sintering-accelerating phase separation temperature above the range where gases are evolved.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
