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Microstructural characteristics and mechanical behavior of B4Cp/6061Al composites synthesized at different hot-pressing temperatures

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Journal of Materials Science & technology 2019年第8期35卷 1523-1531页

作者： Minqiang Gao Zongning Chen Huijun Kang Enyu Guo Rengeng Li Ying Fu Honglan Xie Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024 China Engineering Institute Bohai UniversityJinzhou 121013 China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204 China

B4Cp/6061Al composites have become important structural and functional materials and can be fabricated by powder metallurgy and subsequent hot rolling. In this work, the effects of the hot-pressing temperature on microstructures and mechanical behaviors of the B4Cp/6061Al composites were investigated. The results showed that compared with the T4 heat treated B4Cp/6061Al composite hot pressed at 560℃, the yield strength and failure strain of the composites hot pressed at 580℃ were increased to 235 MPa and 18.4%, respectively. This was associated with the interface bonding strength between the B4C particles and the matrix. However, the reaction products, identified to be MgAl2O4 phases, were detected in the composites hot pressed at 600℃. The formation of the MgAl2O4 phases resulted in the Mg depletion, thus reducing the yield strength to 203.5 MPa after the T4 heat treatment due to the effect of the solid solution strengthening being weakened. In addition, the variation of hardness and electrical conductivity was mainly related to the Mg content in the matrix. Based on the as-rolled microstructures observed by SEM, SR-μCT and fracture surfaces, the deformation schematic diagram was depicted to reflect the tensile deformation process of the composites.

关键词： B4Cp/6061Al composite Hot-pressing temperature Microstructure Mechanical behavior Reaction product

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A novel Cu-bearing high-entropy alloy with significant antibacterial behavior against corrosive marine biofilms

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Journal of Materials Science & technology 2020年第11期42卷 201-210页

作者： Enze Zhou Dongxu Qiao Yi Yang Dake Xu Yiping Lu Jianjun Wang Jessica A.Smith Huabing Li Hongliang Zhao Peter K.Liaw Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Key Laboratory for Anisotrotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Department of Biomolecular Sciences Central Connecticut State University1615 Stanley StreetNew BritainCT 06050USA School of Materials Science and Engineering Zhengzhou University100 Kexue AvenueZhengzhou 450001China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN37996USA

The design of novel high-entropy alloys(HEAs)provides a unique opportunity for the development of structure-function integrated materials with high mechanical and antimicrobial *** this study,by employing the antibacterial effect of copper,a novel Al0.4CoCrCuFeNi HEA with broad-spectrum antibacterial and strong mechanical properties was *** concentrations of copper ions released from the HEA prevented growth and biofilm formation by biocorrosive marine bacterial *** findings serve as a proof-of-concept for further development of unique HEA materials with high antimicrobial efficiency and mechanical properties,compared to conventional antibacterial alloys.

关键词： High entropy alloys Biofilms Antibacterial property Mechanical properties

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Microstructures and Hardening Effects of Refractory High Entropy Alloys Irradiated by Proton & He Ion Dual Beam

SSRN

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SSRN 2023年

作者： Wan, Hao Su, Zhengxiong Yan, Xu Yang, Jinxue Lu, Yiping Shi, Tan Gao, Ning Tang, Yu He, Xinfu Lu, Chenyang School of Mechanical and Electrical Engineering Taizhou University Taizhou225300 China School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China Key Laboratory of Solidification Control and Digital Preparation Technology School of Materials Science and Engineering Dalian University of Technology Liaoning Province Dalian116024 China Institute of Frontier and Interdisciplinary Science Key Laboratory of Particle Physics and Particle Irradiation MOE Shandong University Qingdao266237 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China Department of Materials Science and Engineering College of Aerospace Science and Engineering National University of Defense Technology Changsha410073 China China Institute of Atomic Energy Beijing102413 China

This research revealed the irradiation hardening mechanism in two novel NbZrTiV and VNbMoTaWTi refractory high entropy alloys (RHEAs). The RHEA samples were irradiated by a dual beam of 0.5 MeV protons and 2 MeV He ions at 300 K. Irradiation-induced defect clusters and irradiation hardening were characterized by transmission electron microscope (TEM) and nanoindenter, respectively. It was discovered that the defect clusters were mostly consisted of nano-sized dislocation loops and helium bubbles. The effect of compositional complexity and heterogeneity on defect cluster distribution in the RHEAs was discussed. The yield strength and hardness increments induced by irradiation were calculated by dispersed barrier hardening (DBH) model. The hardness of the entire irradiated layer was estimated according to the volume fraction of the plateau and peak region in hemispherical plasticity affected zone (PAZ). Additionally, nanoindentation was used to assess how bubbles and dislocation loops affected hardening. The actual hardness of the irradiation layer was extracted for nanoindentation hardness using the Kasada method. After that, the DBH-calculated hardness and the measured hardness of the irradiated NbZrTiV and VNbMoTaWTi were compared. The results show that the DBH hardness increments match well with those measured by nanoindentation. © 2023, The Authors. All rights reserved.

关键词： Ions

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Grain refinement and mechanical property enhancement of AM60B magnesium alloy via TiB 2 particle regulation

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Materials Today Communications 2025年 47卷

作者： Hangze Wu Zelong Du Yukang An Zongning Chen Zhirou Zhang Huijun Kang Tongzheng Xin Enyu Guo Guohao Du Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Ningbo Institute of Dalian University of Technology Ningbo 315000 China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute CAS Shanghai 201204 China

AM60B magnesium alloy exhibits a broad range of applications in the industry. However, its relatively low strength makes it unsuitable for more demanding operational conditions. This study demonstrates that the strength and plasticity of AM60B alloy can be significantly enhanced by the addition of trace TiB 2 particles. With the addition of only 0.2 % TiB 2 , the AM60B-0.2TiB 2 exhibits superior mechanical characteristics, recording values of 257 MPa (ultimate tensile), 86 MPa (yield strength), and 15.6 % (elongation) under standardized testing protocols, respectively, which represents an increase of 12.2 %, 13.1 %, and 43.2 %, respectively, compared to the AM60B matrix alloy. Transmission electron microscopy analysis reveals a distinct crystallographic orientation relationship between TiB 2 particles and α-Mg grains, specifically ( 0001 ) TiB 2 // ( 10 1 ̅ 1 ) α − Mg and [ 2 ̅ 110 ] TiB 2 // [ 2 ̅ 110 ] α − Mg , which is consistent with the observed grain refinement effects. Theoretical calculations reveals that the lattice mismatch along this specific orientation is 8.3 %, demonstrating the potential of TiB 2 particulates to act as potent heterogeneous nucleation sites for α-Mg phase formation during solidification processes. Synchrotron tomographic analysis demonstrates that TiB 2 incorporation induces threefold microstructural refinement: grain dimension reduction, intermetallic phase size suppression, and improved secondary phase distribution homogeneity. Quantitative analysis reveals that the improved mechanical properties are primarily attributed to grain boundary and precipitation strengthening.

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Effect of Nb doping on microstructures and thermoelectric properties of SrTiO_3 ceramics

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Chinese Physics B 2018年第4期27卷 90-95页

作者： Da-Quan Liu Yu-Wei Zhang Hui-Jun Kang Jin-Ling Li Xiong Yang Tong-Min Wang Key Laboratory of Solidification Control and Digital Preparation Technology （Liaoning Province） School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China

Nb-doped SrTiO3 thermoelectric ceramics with different niobium concentrations,sintering temperatures and Sr-site vacancies are successfully prepared by high energy ball milling combined with carbon burial *** fully understanding the effect of niobium doping on SrTiO3,thermoelectric transport properties are systematically investigated in a temperature range from 300 K to 1100 *** carrier mobility can be significantly enhanced,and the electrical conductivity is quadrupled,when the sintering temperature rises from 1673 K to 1773 K（beyond the eutectic temperature（1713 K） of SrTiO3–TiO2）.The lattice vibration can be suppressed by the lattice distortion introduced by the doped niobium ***,Sr-site vacancies compensate for the lattice distortion and increase the lattice thermal conductivity more or ***,we achieve a maximum value of figure-of-merit z T of 0.21 at 1100 K for Sr Ti（0.9）Nb（0.1）O3 ceramic sintered at1773 K.

关键词： thermoelectric materials SrTiO3 Nb-doped sintering temperature

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Unraveling the individual and synergistic effects of copper and gadolinium on the microstructure and mechanical properties of Mg-6Zn-0.5Ca alloy

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Journal of Alloys and Compounds 2025年

作者： Zelong Du Chong Wang Fuyuan Liu Zhirou Zhang Huijun Kang Huanyue Zhang Zongning Chen Guohao Du Enyu Guo Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Ningbo Institute of Dalian University of Technology Ningbo 315000 China Instrumental Analysis Center Dalian University of Technology Dalian 116024 China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute CAS Shanghai 201204 China

Improving the strength and ductility of Mg-Zn-Ca alloys is critical for their industrial applications. Herein, the individual and synergistic effects of copper and gadolinium on the microstructure and mechanical properties of Mg-6Zn-0.5Ca alloy were investigated. The results illustrate that the CuMgZn phases along the grain boundaries are connected with Ca 2 Mg 6 Zn 3 phases by addition of Cu while the addition of Gd promotes the formation of Mg 3 Zn 3 Gd 2 in the grain interior of as-cast alloys. After extrusion, the irregular stripped phases consisting of CuMgZn and Ca 2 Mg 6 Zn 3 phases are partially crushed into micro-scale bulk phases. Unexpectedly, the originally unstable Mg 3 Zn 3 Gd 2 phases are bond with the CuMgZn phases and form the spherical phases together with the fragmentation of the irregular phases by co-addition of Cu and Gd. The highest density of remaining second phases after extrusion causes enough density of the dislocation walls, then successively transfer to dynamic recrystallization grain boundaries. Consequently, Mg-6Zn-0.5Ca-0.6Cu-0.6Gd alloy exhibits optimized mechanical properties good combination of UTS (324.4 MPa), YS (290.2 MPa), and EL (11.8%).

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A promising new class of irradiation tolerant materials:Ti_2ZrHfV_(0.5)Mo_(0.2) high-entropy alloy

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Journal of Materials Science & technology 2019年第3期35卷 369-373页

作者： Yiping Lu Hefei Huang Xuzhou Gao Cuilan Ren Jie Gao Huanzhi Zhang Shijian Zheng Qianqian Jin Yonghao Zhao Chenyang Lu Tongmin Wang Tingju Li Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Shanghai Institute of Applied Physics Chinese Academy of Sciences (CAS) School of Materials Science and Engineering Nanjing University of Science and Technology Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Department of Nuclear Engineering and Radiological Sciences University of Michigan

Recently, high-entropy alloys(HEAs) or multi-principal-element alloys with unprecedented physical,chemical, and mechanical properties, have been considered as candidate materials used in advanced reactors due to their promising irradiation resistant behavior. Here, we report a new single-phase bodycentered cubic(BCC) structured Ti_2 ZrHfV_(0.5)Mo_(0.2) HEA possessing excellent irradiation resistance, i.e.,scarcely irradiation hardening and abnormal lattice constant reduction after helium-ion irradiation,which is completely different from conventional alloys. This is the first time to report the abnormal XRD phenomenon of metallic alloys and almost no hardening after irradiation. These excellent properties make it to be a potential candidate material used as core components in next-generation nuclear reactors. The particular irradiation tolerance derives from high density lattice vacancies/defects.

关键词： High-entropy alloy Irradiation resistance Microstructural characterization Defects evolution

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Achieving high strength via significantly enhanced precipitation strengthening in Mg-5Bi-3Al-xSn alloys

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Journal of Alloys and Compounds 2025年 1033卷

作者： Hongrui Li Zhirou Zhang Chao Xu Yafei Liu Lifeng Jiang Shuo Yin Huijun Kang Zongning Chen Enyu Guo Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China AVIC Manufacturing Technology Institute Beijing 100024 PR China Department of Mechanical Manufacturing and Biomedical Engineering Trinity College Dublin The University of Dublin Dublin 2 Ireland Ningbo Institute of Dalian University of Technology Ningbo 315000 China

High strength is a primary objective in developing low-cost Mg-Bi-Al alloys. This study fabricates new Mg-5Bi-3Al- x Sn (wt%, x  = 0, 1, 3 and 5) alloys possessing high mechanical strength after extrusion. In as-extruded alloys, grains are gradually refined with increasing Sn content. Trace Sn (1 wt%) promotes dynamic recrystallization, but a further increase in Sn content inhibits this process, and subsequently leads to weakening and strengthening of texture. Experimental results and density-functional theory calculations suggest that Bi atoms replace Sn atoms in Mg 2 Sn phase and promote precipitation of Mg 2 Sn phase, and Mg 2 Sn gradually becomes one of the main strengthening phases. Tensile tests demonstrate that yield strength and ultimate tensile strength increase progressively with Sn content. As-extruded Mg-5Bi-3Al-5Sn alloy exhibits increments of 72 MPa in yield strength and 63 MPa in ultimate tensile strength compared to as-extruded Mg-5Bi-3Al alloy, which reaches 384 and 400 MPa, respectively. Fine-grained structure and massive uniformly distributed nano precipitates are mainly responsible for high performance. This work offers new insights for optimizing Mg-Bi-Al alloy composition to develop high-strength Mg alloys.

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Tailoring Zr-vacancy induces superior thermoelectric performance of Hf-free ZrCoSb-based half-Heusler compounds

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Nano Energy 2025年 142卷

作者： Shuyue Tan Lifeng Jiang Saichao Cao Donghu Zhou Hongrui Li Huijun Kang Rongchun Chen Zongning Chen Enyu Guo Pengfei Yu Mingxu Xia Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Shanghai Synchrotron Radiation Facility Zhangjiang Laboratory Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China Ningbo Institute of Dalian University of Technology Ningbo 315000 China School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

Recent studies have established a research paradigm for decoupling thermoelectric parameters through Hf doping in half-Heusler (HH) compounds with high structural symmetry. However, the high cost of Hf significantly hinders commercialization, thereby driving the urgent need to develop low-cost and efficient alternatives for performance regulation. Here, we propose a simple and effective modulation strategy, tailoring Zr vacancies to achieve a notable thermoelectric performance for Hf-free ZrCoSb-based HH compounds. We demonstrate the multifunctional roles of Zr vacancies in regulating power factor and thermal conductivity, including local electronic states, in-gap states, and vacancy collapse. As a result, a high figure of merit of ∼0.81 is achieved in Zr 0.9 CoSb 0.8 Sn 0.2 at 973 K by tailoring Zr vacancies, which is nearly the highest value reported for Hf-free ZrCoSb-based HH compounds. This work not only presents a promising pathway to optimize thermoelectric performance in Hf-free HH compounds but also provides new insights into vacancy engineering for HH compounds.

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Negative mixing enthalpy route guides strong and ductile soft magnetic high-entropy alloys with high saturation magnetization

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Materials Today 2025年

作者： Shang Zhao Mingliang Wang Xiaodong Han Zeyu Ding Huan Wang Peter K. Liaw Yusheng Wang Yiping Lu Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Engineering Research Center of High Entropy Alloy Materials (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Beijing Key Laboratory of Microstructure and Property of Advanced Materials Faculty of Materials and Manufacturing Beijing University of Technology Beijing China Department of Materials Science and Engineering The University of Tennessee Knoxville TN 37996 USA

Soft magnetic materials need high saturation magnetization ( M s ), low coercivity ( H c ) , and excellent mechanical properties to ensure the safe and efficient operation of the electric engine. Realizing these characteristics in a material is challenging because of the conflict between mechanical and soft magnetic properties. Soft magnetic high-entropy alloys (HEAs) with excellent mechanical properties have attracted particular attention due to their unique microstructures that overcome the dilemma of high strength and coercivity. However, its lower saturation magnetization than conventional soft magnetic alloys limits the power output of the machine, which is against lightweight development. Herein, we propose a negative mixing enthalpy route and fabricate a Fe-Co-Ni-Al-Nb-B HEA. The alloy has high saturation magnetization ( M s = 135.28 Am 2 kg −1 ), low coercivity ( H c = 227.54 A m −1 ), high tensile strength ( σ UTS = 1187.5 MPa), and elongation ( ε f = 38.7 %). These exhibit a combination that surpasses other state-of-the-art soft magnetic alloys. This excellent performance synergy is attributed to the negative mixing enthalpy ( Δ H mix ) between ferromagnetic elements (Fe, Co, and Ni) and strengthening elements (Al and Nb), facilitating the formation of ordered L1 2 nanoprecipitates, which favors the mechanical properties and simultaneously maintain a low H c . The present work provides valuable insight into the development of high-performance soft magnetic materials with both strength and ductility.

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