Article
Chemistry, Physical
M. Soledade C. S. Santos, Joao Carlos R. Reis
Summary: This study examines the effect of temperature on surface tension in liquid alloys with a positive or negative temperature coefficient and a gravity limitation of the surface concentration in the surface-active metal constituent. It is found that the temperature coefficient depends on the combined effects of increased surface tension due to diminished segregation. The study provides equations and analysis methods based on Butler's thermodynamics for ideal surface phases. The results are illustrated using specific alloys such as Al-Zn, Sn-Bi, Ga-Bi, Ga-Pb, and Cu-Pb. The theoretical prediction of specific concave down d gamma/dT curves of liquid alloys is also made, and good estimates are obtained for systems with positive and negative temperature coefficients. However, deviations may occur during phase transitions or for systems with non-ideal behavior. (c) 2023 Published by Elsevier B.V.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Xinran Liu, Le Chang, Tianhao Ma, Changyu Zhou
Summary: This study investigates the deformation behavior of the CoCrCuFeNi high-entropy alloy (HEA) under uniaxial tensile and compressive loads at varying temperatures using molecular dynamics simulations. The results show that the material exhibits temperature-induced softening in all cases. The mechanical properties of the HEA display an orientation dependence and tension-compression asymmetry. The plastic deformation mechanisms involve the formation and annihilation of stacking faults and twins resulting from the gliding of partial dislocations.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jun Jiang, Weifu Sun, Ning Luo
Summary: The effects of temperature and grain diameter on the micro-deformation mechanism, tensile properties, and sluggish diffusion of nanocrystalline Al0.1CoCrFeNi HEAs during uniaxial tension have been studied using molecular dynamics (MD) simulations. The results demonstrate that the Hall-Petch relation and inverse Hall-Petch relation still exist in nanocrystalline HEAs. The deformation mechanism of HEAs varies with grain diameter, conforming to either the H-P relation or the reverse H-P relation. Higher temperatures have a negative influence on the mechanical properties of HEAs, including Young's modulus, yield strength, and flow stress. It is observed that grain boundaries play a crucial role in atomic diffusion at higher temperatures.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Heng Lu, Yi He, Zhe Zhao, Chen Zhang, Yaowu Hu
Summary: A novel synchronous laser shock modulation of melt pool method was proposed to address the columnar crystal growth issue in additive manufacturing high entropy alloys. Experimental and numerical simulations were conducted to validate the effectiveness of this method.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Coatings & Films
Rui Yang, Xin Guo, Huijun Yang, Junwei Qiao
Summary: Boronization can enhance the wear resistance of high-entropy alloys (HEAs), especially at high temperatures. In this study, Fe40Mn20Cr20Ni20 HEAs were boronized at 900 degrees C for 6 hours and their tribological properties were tested from 20 to 600 degrees C. The results showed that boronized alloys exhibited improved wear resistance, with lower coefficients of friction and wear rates compared to hot-rolled alloys. The wear mechanisms varied with temperature, with abrasive and adhesive wears predominant at lower temperatures and oxidation and abrasive wears predominant at higher temperatures. Boronization improved the wear resistance of HEAs in high temperature through the formation of B2O3 and the thermal stability of the boronized layer.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Ziqiang Dong, Ankang Sun, Shuang Yang, Xiaodong Yu, Hao Yuan, Zihan Wang, Luchen Deng, Jinxia Song, Dinggang Wang, Yongwang Kang
Summary: A machine learning integrated workflow was used to guide the design of Cr, Al-containing five-element high-entropy alloys (HEAs) with enhanced high-temperature oxidation resistance. ML directed the design of HEAs with a chemical composition of Fe, Cr, Al, Ni, and Cu for improved oxidation resistance. The oxidation behavior of AlxCrCuFeNi (x = 0, 0.25, 0.5, 1) HEAs at 1100 degrees C in air was systematically studied and the oxidation mechanism was elucidated. Experimental validation agreed well with the ML prediction, showing that ML can be a powerful tool for designing alloys with optimized oxidation resistance.
Article
Chemistry, Physical
Heng Lu, Xiaohan Zhang, Jian Liu, Shusen Zhao, Xuechun Lin, Hui Li, Yaowu Hu
Summary: A novel approach, real-time laser shock modulation of melt pool (LSMMP), is proposed for modifying high-entropy alloy (HEA) melt pools to achieve desired characteristics. Experimental and numerical simulation results demonstrate that LSMMP can alter the flow pattern of the melt pool, accelerate melt pool flow, and inhibit columnar crystal growth, leading to improved microstructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Xuyao Zhang, Weiguo Li, Jiasen Xu, Ruozhen Zhang, Pan Dong, Yanli Ma, Haibo Kou
Summary: In this study, a theoretical model for the temperature-dependent surface tension (TDST) of binary liquid alloys (BLAs) was developed based on broken-bond rules. The model, combined with the classical ideal solution model, offers a simple method for predicting the surface tension of BLAs with different component concentrations.
SURFACES AND INTERFACES
(2022)
Review
Materials Science, Multidisciplinary
Zhuo Cheng, Shuize Wang, Guilin Wu, Junheng Gao, Xusheng Yang, Honghui Wu
Summary: Tribology, the study of friction, wear, and lubrication, is crucial for understanding the service performance of structural materials. High-entropy alloys (HEAs), with their excellent hardness and wear resistance, show great potential in enhancing the tribological properties. This review provides insights into the tribological behavior of HEAs and strategies for improving their performance, both at room temperature and elevated temperatures.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Weijie Zheng, Shulin Lu, Shusen Wu, Xiaohua Chen, Wei Guo
Summary: Due to their solid solution structure, high-entropy alloys exhibit high strength and resistance to softening at both high and ambient temperatures. However, their high density and low plasticity at ambient temperature limit their widespread applications. This study investigated the microstructure and mechanical properties of MoNbVTx HEA with different Ta contents and found that certain alloys exhibited superior high temperature performance and relatively low density, making them potential materials for structural applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Chenglei Wang, Chaojie Liang, Mujin Yang, Chao Huang, Zhifu Yao, Bing Qiu, Kexiang Zhang, Yingguan Xie, Mulin Liang, Weijie Liu, Jijie Yang, Shengfeng Zhou
Summary: In this study, a series of novel gamma' phase strengthened Ti6Al6-based HEAs with six different alloying elements were examined. The presence of impurity phases and the microstructure of the alloys were investigated using various characterization techniques. The addition of W, Mo, and V elements improved the strength-plasticity combination of the HEAs at both room temperature and high temperature. The peak position of the alloys shifted to the left with the addition of W, Mo, and V elements. The coherent relationship between the gamma' precipitates phase and the FCC matrix phase contributed to the increased strength of the alloys without sacrificing plasticity.
MATERIALS & DESIGN
(2022)
Review
Materials Science, Multidisciplinary
Deepak Kumar
Summary: Wear and friction are inevitable failures in mechanical systems with moving components， and the development of new materials such as high entropy alloys (HEAs) offers promising solutions. HEAs provide exceptional wear resistance, reduced friction, thermal stability, hardness, corrosion resistance, and mechanical strength, making them highly desired for tribological applications. This review focuses on various aspects of HEAs tribology and proposes future recommendations for the advancement of HEAs manufacturing and their diverse tribological applications.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Patrick L. J. Conway, T. P. C. Klaver, Jacob Steggo, Ehsan Ghassemali
Summary: By conducting high-throughput screening in the Co-Cr-Fe-Mn-Ni system, 'islands' of single phase FCC structure were identified, reducing the material cost compared to the equiatomic alloy. Experimental investigation of the alloy revealed lower strength but excellent thermal strength, with softening behavior attributed to solid solution hardening. Proposed modified models for stacking fault energy and solid solution hardening could be utilized in high-throughput screening algorithms for accelerated alloy design with specific mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Y. Z. Wang, Z. M. Jiao, G. B. Bian, H. J. Yang, H. W. He, Z. H. Wang, P. K. Liaw, J. W. Qiao
Summary: Face-centered-cubic (FCC) Fe40Mn20Cr20Ni20 high-entropy alloys (HEAs) were fabricated by industrialized vacuum-induction melting and formed a heterogenous structure consisting of a phase distribution and grain size after thermomechanical treatments. Under dynamic tension, the alloy showed simultaneous enhancements in strength and ductility due to the activation of multiple strengthening mechanisms. This study provides new insights for developing high-performance HEAs to resist dynamic impacts.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Yegi Vamsi Krishna, Ujjawal Kumar Jaiswal, M. R. Rahul
Summary: The study used machine learning to predict a multiphase alloy system SS + IM with high entropy alloys, with Artificial Neural Network (ANN) showing the highest accuracy. Experimental verification confirmed the accuracy of ANN predictions in the alloy system, but also revealed overlapping design parameters hindering successful prediction.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
O. A. Chikova, G. A. Tkachuk, V. V. V'yukhin
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
(2019)
Article
Chemistry, Physical
O. A. Chikova, N. I. Sinitsin, V. V. V'yukhin
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
(2019)
Article
Crystallography
O. Chikova, N. Sinitsin, V. Vyukhin, D. Chezganov
JOURNAL OF CRYSTAL GROWTH
(2019)
Article
Chemistry, Physical
N. Sinitsin, O. A. Chikova, V. V. V'yukhin
Summary: Surface tension measurements of Fe-Mn-C melts revealed anomalies in the temperature dependences of the surface tension coefficient, indicating irreversible destruction of microheterogeneity. The temperature at which microheterogeneity was destroyed was determined.
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Physics, Multidisciplinary
O. A. Chikova, N. I. Sinitsin, V. V. V'yukhin
Summary: This paper investigates the specific electrical resistivity of liquid Fe-Mn alloys as the manganese content varies, revealing trends through experimentation and theoretical calculations at specific temperature conditions. The study provides key data on the behavior of electrical resistivity in liquid alloys under different manganese concentrations.
RUSSIAN PHYSICS JOURNAL
(2021)
Article
Metallurgy & Metallurgical Engineering
O. A. Chikova, V. V. Vyukhin, V. S. Tsepelev
Summary: The effect of melt superheating treatment (MST) on Al-Sn alloys was studied by measuring temperature dependence of various properties. The optimal superheat temperature was determined for each alloy, leading to changes in viscosity and surface tension. The MST mode can improve the microstructure and mechanical properties of the ingot by altering the properties of the melt before solidification.
RUSSIAN JOURNAL OF NON-FERROUS METALS
(2021)
Article
Chemistry, Physical
O. A. Chikova, N. I. Sinitsin, V. V. V'yukhin
Summary: The study presents original experimental data on the viscosity of liquid Al-In alloys and discusses the concept of microheterogeneity of metal melts. The conclusions drawn from the data suggest patterns of microheterogeneity evolution with changes in melt temperature, with a numerical estimate of parameters such as dispersed particle size.
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Materials Science, Multidisciplinary
N. I. Sinitsin, O. A. Chikova, V. V. V'yukhin
Summary: The resistivity of liquid Fe-Mn-C alloys with varying manganese and carbon contents was measured using the rotating magnetic field method. It was found that the resistivity during heating was lower than during subsequent cooling, with some alloys showing anomalies in the temperature dependence of resistivity during heating between 1550-1680°C. The addition of manganese and carbon was shown to influence the resistivity and temperature coefficient of the melts.
INORGANIC MATERIALS
(2021)
Article
Metallurgy & Metallurgical Engineering
I. Slinkin, O. A. Chikova, V. V. V'yukhin
Summary: Neodymium is a widely used rare-earth metal in the manufacturing of permanent magnets, with experimental data reported on its physicochemical properties in liquid state. The study also investigates the behavior of Fe-30% Nd-1% B-1% Co-1% Dy alloy. Results show the temperature dependence of kinematic viscosity and electrical resistivity, as well as anomalous behavior in the viscosity of the alloy at certain temperatures. The findings provide insights for optimizing production conditions of NdFeB magnets.
RUSSIAN METALLURGY
(2021)
Proceedings Paper
Multidisciplinary Sciences
N. Sinitsin, O. A. Chikova, V. V. V'yukhin
VII INTERNATIONAL YOUNG RESEARCHERS' CONFERENCE - PHYSICS, TECHNOLOGY, INNOVATIONS (PTI-2020)
(2020)
Article
Metallurgy & Metallurgical Engineering
I. V. Slinkin, O. A. Chikova, V. V. V'yukhin
RUSSIAN METALLURGY
(2020)
Article
Metallurgy & Metallurgical Engineering
O. A. Chikova, I. V. Slinkin, V. V. V'yukhin
RUSSIAN METALLURGY
(2020)
Article
Metallurgy & Metallurgical Engineering
G. A. Tkachuk, O. A. Chikova, V. V. V'yukhin
RUSSIAN METALLURGY
(2019)
Article
Metallurgy & Metallurgical Engineering
Olga Chikova, Vladimir Tsepelev, Vladimir V'yukhin, Kseniya Shmakova, Vadim Il'in
ACTA METALLURGICA SLOVACA
(2019)
Article
Metallurgy & Metallurgical Engineering
V. V. V'yukhin, O. A. Chikova, M. A. Borovykh, V. S. Tsepelev
RUSSIAN METALLURGY
(2018)
