Junjie Feng

China University of Mining and Technology

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Fuxiang Wei

China University of Mining and Technology

Yanwei Sui

China University of Mining and Technology

Jiqiu Qi

China University of Mining and Technology

Honglian Deng

China University of Mining and Technology

Qingkun Meng

China University of Mining and Technology

Tailin Yang

China University of Mining and Technology

Xiang Zhang

Yanshan University

HU Zheng-hai

Northwest University

Yanyan Wang

Chinese Academy of Sciences

Peng Cao

University of Auckland

Cooperative Institutions

China University of Mining and Technology

Southeast University

Huazhong University of Science and Technology

Chinese Academy of Sciences

Chinese Academy of Agricultural Sciences

Dalian University of Technology

Beihang University

Harbin Institute of Technology

Tianjin University

University of Auckland

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Influence of Al and Ti Alloying and Annealing on the Microstructure and Compressive Properties of Cr-Fe-Ni Medium-Entropy Alloy

Tailin Yang Junjie Feng Yanyan Wang Honglian Deng Xiang Zhang

This research investigates the impact of Al and Ti elements on the formation of self-generated ordered phase in high-entropy alloys, which have been receiving widespread concentration in present times thanks to their remarkable multifunctional properties and wide range of component selection. By adjusting the dual elements of Al and Ti, the study explores the regulation of quantity and distribution of the in-situ self-generated ordered phases in the alloy. The results of the annealing heat treatment process demonstrated that, by adding Al and Ti elements, the Cr-Fe-Ni medium-entropy alloy transfer from BCC phase to BCC+FCC phase and the precipitation of new phases such as B2, L21, and σ. This led to a synergistic impact of second phase strengthening, and also of solid solution strengthening, resulting in improved compressive properties of high-entropy alloy.

High-Entropy Alloys

10.2139/ssrn.4576883

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Influence of Al and Ti Alloying and Annealing on the Microstructure and Compressive Properties of Cr-Fe-Ni Multi-Principal Element Alloy

Metals (2024)

Keyan An Tailin Yang Junjie Feng Honglian Deng Xiang Zhang

This study meticulously examines the influence of aluminum (Al) and titanium (Ti) on the genesis of self-generated ordered phases in high-entropy alloys (HEAs), a class of materials that has garnered considerable attention due to their exceptional multifunctionality and versatile compositional palette. By meticulously tuning the concentrations of Al and Ti, this research delves into the modulation of the in situ self-generated ordered phases’ quantity and distribution within the alloy matrix. The annealing heat treatment outcomes revealed that the strategic incorporation of Al and Ti elements facilitates a phase transformation in the Cr-Fe-Ni medium-entropy alloy, transitioning from a BCC (body-centered cubic) phase to a BCC + FCC (face-centered cubic) phase. Concurrently, this manipulation precipitates the emergence of novel phases, including B2, L21, and σ. This orchestrated phase evolution enacts a synergistic enhancement in mechanical properties through second-phase strengthening and solid solution strengthening, culminating in a marked improvement in the compressive properties of the HEA.

10.3390/met14111223

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Study on the Microstructure and Mechanical Properties of Alcr1.6fexni(3.2-X)Si0.2 High-Entropy Alloys

Tailin Yang Honglian Deng Yanyan Wang Junjie Feng Qingkun Meng

Compared to traditional alloys, high-entropy alloys (HEA) have superior mechanical properties, corrosion resistance, and oxidation resistance, garnering significant interest among scholars. This article explores the influence of element types and contents on the microstructure and mechanical properties of AlCrFeNi HEA achieved by incorporating Si element and regulating the level of Fe and Ni elements. The results indicate that with the expansion of Fe element, the eutectic structure of alloys transitions from B2+ σ phases to B2+BCC phases. The microstructure of the alloy changes from floral and cellular eutectic structures to dendritic structures, with cellular eutectic structures distributed within the interdendritic framework. Owing to the impact of the σ phase volume fraction, the hardness level of alloys with high entropy decreases from 584.1 HV to 365.7 HV as the Fe element rises. The fracture section of alloys exhibit clear river patterns and rock sugar like patterns, resulting in brittle fracture.

High-Entropy Alloys

10.2139/ssrn.4705447

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Influence of Al and Ti Alloying and Annealing on the Microstructure and Compressive Properties of Cr-Fe-Ni Medium-Entropy Alloy

Tailin Yang Junjie Feng Yanyan Wang Honglian Deng Xiang Zhang

Download This Paper Open PDF in Browser Add Paper to My Library Share: Permalink Using these links will ensure access to this page indefinitely Copy URL Copy DOI

10.2139/ssrn.4668997

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Electrothermal, magnetic properties and microstructure of CrFeNiTi_x compositionally complex alloys

Ferroelectrics (2021)

Yongfeng Li Yidong Miao Junjie Feng Xuan Wu Lijuan Pang

In this article, the transformation laws of microstructural formation, phase evolution, electrothermal and magnetic properties in as-cast and annealed CrFeNiTix compositionally complex alloys have been systematically investigated. The result showed that annealed CrFeNiTix alloys consisted of the [Fe, Cr] solid solution (BCC), CrFeNi solid solution (FCC) and rich-(Ni, Ti) intermetallic compound (HCP). Transmission electron microscope indicated that the rich-(Ni, Ti) intermetallic nanoparticles, which were distributed on the disordered BCC [Fe, Cr] solid solution of CrFeNiTi0.4 alloy matrix, grew and transformed. For CrFeNiTix alloys, the electrical resistivity increased with Ti addition and increase of thermal conductivity was presented with decreasing Ti content. In addition, annealed treatment could decrease electrical resistivity but increased thermal conductivity of as-cast alloys. Moreover, the CrFeNiTix alloys exhibited typical soft-magnetic characteristic indicated by low coercivity. The saturation magnetization of as-cast and annealed CrFeNiTix alloys rose at the beginning, then reduced with the addition of Ti content. It suggested that CrFeNiTix alloys with major solid solutions showed the better soft-magnetic properties than those with major intermetallic compound, which is influenced by the crystal structure, phase boundaries and defects.

10.1080/00150193.2021.1984771

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Citations (2)

Influence of Al and Ti Alloying and Annealing on the Microstructure and Compressive Properties of Cr-Fe-Ni Medium-Entropy Alloy

Keyan An Tailin Yang Junjie Feng Honglian Deng Xiang Zhang

This research investigates the impact of Al and Ti elements on the formation of self-generated ordered phase in high-entropy alloys (HEA), which have been receiving widespread concentration in present times thanks to their remarkable multifunctional properties and wide range of component selection. By adjusting the dual elements of Al and Ti, the study explores the regulation of quantity and distribution of the in-situ self-generated ordered phases in the alloy. The results of the annealing heat treatment process demonstrated that, through accession Al and Ti elements, the Cr-Fe-Ni medium-entropy alloy transfer from BCC phase to BCC+FCC phase and the precipitation of new phases such as B2, L21, and σ. This led to a synergistic impact of second phase strengthening, and also of solid solution strengthening, resulting in improved compressive properties of HEA.

High-Entropy Alloys

10.20944/preprints202409.1787.v1

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Effect of Microstructure and Performance of Nb–Cr–Fe–Ni Quaternary Alloys with the Variation of Niobium Element Content

Transactions of the Indian Institute of Metals (2022)

Honglian Deng Linsen Li Junjie Feng Jiqiu Qi Fuxiang Wei

Laves phase

Passivation

10.1007/s12666-022-02644-z

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Water-Fertilizer Regulation Improves Yield, Quality, and Water-Fertilizer Use Efficiency of Greenhouse Lettuce by Altering the Bacterial Community in Nutrient Solutions

Q Zhao Junjie Feng Shulong Guo S. J. Yang Rui Jing

Soil nutrients

10.2139/ssrn.5049533

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A Prediction Method for the Average Winding Temperature of a Transformer Based on the Fully Connected Neural Network

Applied Sciences (2024)

Junjie Feng Ziyu Feng Guojun Jiang Guangyong Zhang Wei Jin

The average winding temperature of a transformer (AWTT), serving as a key indicator for assessing the running state of the transformer, is of utmost importance in determining a transformer’s electrical properties and the insulation longevity of the transformer. An accurate prediction of AWTT is essential for ensuring the safe operation of the transformer. A novel method for predicting AWTT is introduced based on the analysis of field monitoring data. Firstly, the thermal characteristics and operational mechanisms of oil-immersed transformers are examined. Secondly, a factor analysis model is developed to streamline the network structure, accounting for the strong correlations among ambient temperature, load current, and top oil temperature. Thirdly, the independent temperature factor and load factor are extracted as pivotal features, and then input into the fully connected neural network to predict AWTT. Through a case study involving a 110 kV/10 kV oil-immersed transformer, the results show that the proposed method reduces redundant correlation information compared to traditional methods and improves the prediction accuracy of AWTT, establishing a foundation for further transformer state assessments.

10.3390/app14156841

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Effects of minor B addition on microstructure and properties of Al19Co20Fe20Ni41 eutectic high-entropy alloy

Transactions of Nonferrous Metals Society of China (2021)

Junjie Feng Shuo Gao Kun Han Yidong Miao Jiqiu Qi

The simultaneous strengthening of mechanical and magnetic properties is an ideal fabrication strategy for soft-magnetic materials. A non-equiatomic Al19Co20Fe20Ni41 eutectic high-entropy alloy was prepared to investigate the alloying effect of B on the microstructure evolution, phase formation, mechanical and soft-magnetic properties. With the increase in B content, the microstructures of (Al19Co20Fe20Ni41)100−xBx alloys transformed from the initial lamellar eutectic structure (x=0) to the divorced eutectic structure (x>0.6). Fine borides precipitated in the intergranular phase (x≥0.6). The hardness of alloys increased from HV 328.66 to HV 436.34 and the compression mechanical performance displayed a transition from plastic material to brittle material. The Al19Co20Fe20Ni41 alloy possesses good soft-magnetic properties, and the minor B addition has little effect on it. Increasing the resistivity can effectively reduce the eddy current loss when used as a soft-magnetic material.

10.1016/s1003-6326(21)65560-7

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Citations (21)