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Microwave Absorption of Crystalline Fe/MnO@C Nanocapsules Embedded in Amorphous Carbon

Nano-Micro Letters 2020年第4期12卷 152-167页

作者： Gaihua He Yuping Duan Huifang Pang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology

Crystalline Fe/MnO@C core–shell nanocapsules inlaid in porous amorphous carbon matrix(FMCA)was synthesized successfully with a novel confinement *** heterogeneous Fe/MnO nanocrystals are with approximate single-domain size which gives rise to natural resonance in 2–18 *** addition of MnO2 confines degree of graphitization catalyzed by iron and contributes to the formation of amorphous *** heterogeneous materials composed of crystalline–amorphous structures disperse evenly and its density is significantly reduced on account of porous ***,adjustable dielectric loss is achieved by interrupting Fe core aggregation and stacking graphene conductive *** dielectric loss synergistically with magnetic loss endows the FMCA enhanced *** optimal reflection loss(RL)is up to−45 dB,and the effective bandwidth(RL<−10 dB)is 5.0 GHz with 2.0 mm *** proposed confinement strategy not only lays the foundation for designing high-performance microwave absorber,but also offers a general duty synthesis method for heterogeneous crystalline–amorphous composites with tunable composition in other fields.

关键词： Crystalline nanocapsule Amorphous carbon Core–shell structure Interfacial polarization Microwave absorption

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Constructing Bi_(2)WO_(6)-decorated TiO_(2) composite films for photocathodic protection of 304 stainless steel

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Journal of Iron and Steel Research International 2021年第8期28卷 1054-1063页

作者： Ming-liang Wang Yuan Lin Yi-ping Lu Na Wei Ting-ju Li Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024LiaoningChina School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590ShandongChina

Bi_(2)WO_(6) nanoplate/TiO_(2) nanowire and Bi_(2)WO_(6) nanoflower/TiO_(2) nanowire composite films were successfully prepared using a hydrothermal *** results show that the light absorption for Bi_(2)WO_(6)/TiO_(2) composite films is extended to the visible region after Bi_(2)WO_(6) nanoplates and nanoflowers are assembled onto TiO_(2) ***,Bi_(2)WO_(6) nanoflower/TiO_(2) nano wire composite film exhibits a better absorption property compared to Bi_(2)WO_(6) nanoplate/TiO_(2) nanowire film,which is mainly ascribed to the narrower bandgap of Bi_(2)WO_(6) nanoflower compared to that of Bi_(2)WO_(6) *** photocurrent density for Bi_(2)WO_(6) nanoflower/TiO_(2) nanowire and Bi_(2)WO_(6) nanoplate/TiO_(2) nanowire composite films can reach 95 and 62.5 μA cm-2,respectively,which are much higher than that obtained for a pure TiO_(2) nanowire film(25 μA cm-2).Meanwhile,under illumination,the pure TiO_(2) nanowire,Bi_(2)WO_(6) nanoplate/TiO_(2) nanowire and Bi_(2)WO_(6) nanoflower/TiO_(2) nanowire films can reduce the potential of the coupled 304 stainless steel in 3.5 wt.%NaCl solution by 299,719 and 739 mV,***,Bi_(2)WO_(6) nanoflower/TiO_(2) nanowire film is found to provide the best effective photocathodic protection for 304 stainless *** work not only provides an example of shape-dependent photocathodic protection based on Bi_(2)WO_(6) but also opens up new possibilities to design an ideal microstructure on the basis of semiconductor materials for future applications of photocathodic protection.

关键词： Photocathodic protection Composite film Bi_(2)WO_(6) TiO_(2) Stainless steel

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球化和再结晶工艺协同改善脆性CoCrNi_(2)(V_(3)B_(2)Si)_(0.2)共晶高熵合金强韧性研究

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Science China Materials 2023年第11期66卷 4197-4206页

作者：张令坤阿卜杜喀迪尔·艾麦尔张梦圆刘瑾泽闫宏伟张永安卢一平 Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.LTDBeijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China

共晶高熵合金因其所展现出的特殊物理/化学性能而受到材料界的广泛关注.然而,除了FCC+B2系外,其他大部分所报道的共晶高熵合金系均呈现为固有脆性,这使得它们逐渐失去了工业应用的竞争优势.本工作提出了一种新的协同改善脆性CoCrNi_(2)(... 详细信息

共晶高熵合金因其所展现出的特殊物理/化学性能而受到材料界的广泛关注.然而,除了FCC+B2系外,其他大部分所报道的共晶高熵合金系均呈现为固有脆性,这使得它们逐渐失去了工业应用的竞争优势.本工作提出了一种新的协同改善脆性CoCrNi_(2)(V_(3)B_(2)Si)_(0.2)共晶高熵合金强韧性的球化+再结晶工艺.基于该工艺,CoCrNi_(2)(V_(3)B_(2)Si)_(0.2)共晶高熵合金获得了一种精心设计的球状M3B2镶嵌在细小FCC晶界处的微观结构,使其抗拉强度、屈服强度和延伸率从923 MPa/620 MPa/1.3%提高到1326-1530 MPa/990-1330 MPa/8.4%-13.9%,提高了43.7%-65.8%/59.7%-114.5%/546%-9.69%.强塑化机制主要归因于球化和再结晶微观结构提供了更多的界面阻碍位错移动和促进了更加均匀的应力分布.该工作为协同改善脆性共晶高熵合金强韧性以满足工程安全性需求提供了新的思路.

关键词： eutectic high-entropy alloys microstructure spher-oidization recrystallization mechanical properties

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Design and preparation of aluminum alloy with high thermal conductivity based on CALPHAD and first-principles calculation

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China Foundry 2022年第3期19卷 225-237页

作者： Ye Wang Hui-jun Kang Yu Guo Hong-tao Chen Mao-liang Hu Ze-sheng Ji School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150004China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationDalian 116024LiaoningChina Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024LiaoningChina School of Science and Engineering Huzhou CollegeHuzhou 313000ZhejiangChina

To obtain the aluminum alloy with high thermal and mechanical properties,the effects of alloying elements and the second phases on the thermal conductivity of Al alloys were investigated by CALPHAD and first-principles calculation,*** properties of the second phases,including Young's modulus,Poisson's ratio and minimum thermal conductivity,were systematically *** show that the ranking order of the effects of the alloying elements on the thermal conductivity is Mg>Cu>Fe>Si,and for Al-12Si alloys,the mathematical model of the relationship between the alloying elements and the thermal conductivity can be expressed as λ=ax^(2)-bx+c when the second phase precipitates in the *** kinds of ternary phases of Al-Fe-Si have higher deformation resistance,rigidity,theoretical hardness,Debye temperature and thermal conductivity than the other phases which possibly exist in the Al-12Si *** on the guidance of CALPHAD and first-principles calculation,the optimized chemical composition of Al alloy with high conductivity is Al-11.5Si-0.4Fe-0.2Mg(wt.%)with a thermal conductivity of 137.50 W·m^(-1)·K^(-1)and a hardness of 81.3 HBW.

关键词： design and preparation CALPHAD first-principles calculation thermal conductivity aluminum alloy

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一种兼具优异软磁性能和耐腐蚀性能的高熵合金

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Science China Materials 2023年第2期66卷 772-779页

作者：段嘉诚王明亮黄瑞苗军伟卢一平王同敏李廷举 Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China High Entropy Alloy Material Engineering Research Center(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China

耐腐蚀性能差限制了大多数软磁材料在腐蚀环境中的应用,尤其是海洋环境.因此,提高软磁材料的耐腐蚀性能是其在海洋环境工业应用的关键.然而,磁性能和耐腐蚀性能之间存在矛盾关系,耐腐蚀性能的主要贡献元素Cr的反铁磁性会严重损害合金的... 详细信息

耐腐蚀性能差限制了大多数软磁材料在腐蚀环境中的应用,尤其是海洋环境.因此,提高软磁材料的耐腐蚀性能是其在海洋环境工业应用的关键.然而,磁性能和耐腐蚀性能之间存在矛盾关系,耐腐蚀性能的主要贡献元素Cr的反铁磁性会严重损害合金的磁性能.本研究开发了一种兼具优异力学性能和耐腐蚀性能的软磁高熵合金(Fe_(2.25)Co_(1.25)Cr)_(94)Al_(6),其综合性能优于绝大多数已报道的传统和高熵合金软磁材料.该合金的饱和磁化强度高达141.88 emu g^(-1),矫顽力仅有2.9 Oe;其在模拟海水中的耐腐蚀性能优于大多数已报道的软磁高熵合金和传统304不锈钢;同时,该合金还具有优异的力学性能,屈服强度高达1.1 Gpa,压缩断裂延伸率超过33%,硬度高于469 HV.这种新型的耐蚀软磁高熵合金有望满足海洋环境中的使役要求,解决软磁材料在海洋腐蚀环境下的使役难题.

关键词：软磁性能 304不锈钢软磁材料高熵合金耐腐蚀性能海洋环境饱和磁化强度断裂延伸率

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Transformation between nanosheets and nanowires structure in MnO2 upon providing Co^2+ions and applications for microwave absorption

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Nano Research 2020年第1期13卷 95-104页

作者： Lulu Song Yuping Duan Jia Liu Huifang Pang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116085China

The phase transition process of the MnO2 phase with increases in Co^2+doping can be described by the Ouroboros *** undoped sample is pureδ-MnO2 with nanosheets *** a small amount of Co^2+ions changes the final products and generatesα-MnO2 nanofibres in theδ-MnO2 *** products become pureα-MnO2 with an appropriate amount of Co ***,when the Co amount continues to increase,the amount ofα-MnO2 decreases in the products and turns back to form pureδ-MnO2 in the *** the electromagnetic absorption performance,the relationship between the properties and the proportion ofδ-MnO2/α-MnO2 in the powders adjusted by Co^2+doping has been explored,and the composites ofδ-/α-MnO2 show better absorption ability than the single-phase *** a result,the optimal reflection loss(RL)is−54.8 dB,and the effective absorption bandwidth can cover the Ku band at a thickness of 2.2 mm and the X band at a thickness of 3.1 mm with 50 wt.%filler loading *** research might shed new light on the improvement of novel microwave absorption materials.

关键词： phase transitions self-assembly impedance matching microwave absorption

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Top-down method to fabricate TiNi_(1+x)Sn half-Heusler alloy with high thermoelectric performance

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Journal of Materials Science & technology 2021年第28期87卷 39-45页

作者： Xiong Yang Daquan Liu Jianbo Li Ruonan Min Huijun Kang Li Linwei Zongning Chen Enyu Guo Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China School of Physics and Electronic Information Hulunbeier UniversityInner Mongolia 021008China Ningbo Institute of Dalian University of Technology Ningbo 315000China

The top-down method was used to fabricate the TiNi_(1+x)Sn half-Heusler *** knotty problems have been solved using the top-down method,including the generation of impurity phases,the visible discrepancy in the grain size of the TiNi_(2)Sn second phase,and irregular variations in the Seebeck coefficient(S),electrical conductivity(σ),and thermal conductivity(κ)with increasing Ni *** generation of a large number of incoherent interfaces between the half-Heusler(HH)and full-Heusler(FH)phases fabricated by the top-down method drastically improved and retained κ and S,thereby leading to an enhancement in the dimensionless figure of merit(ZT)by~19%for the TiNi_(1.05)Sn sample as compared to the ZT of the samples prepared by the conventional method.

关键词： n-type TiNi_(1+x)Sn Thermoelectric Thermal conductivity Incoherent interfaces Electrical conductivity

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Tensile deformation behavior and mechanical properties of a bulk cast Al0.9 CoFeNi2 eutectic high-entropy alloy

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Journal of Materials Science & technology 2021年第2期61卷 119-124页

作者： Hui Jiang Dongxu Qiao Wenna Jiao Kaiming Han Yiping Lu Peter K.Liaw College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Stare Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Department of Materials Science and Engineering the University of TennesseeKnoxvilleTN37996USA

In this study,a new Al0.9CoFeNi2 eutectic high entropy alloy(EHEA) was designed,and the microstructures as well as the deformation behavior were *** bulk cast Al0.9CoFeNi2 EHEA exhibited an order face-centered cubic FCC(L12) and an order body-centered cubic(B2) dual-phase lamellar eutectic *** volume fractions of FCC(L12) and B2 phases are measured to be 60 % and 40 %,*** combination of the soft and ductile FCC(L12) phase together with the hard B2 phase resulted in superior strength of 1005 MPa and ductility as high as 6.2 % in tension at room *** Al0.9CoFeNi2 EHEA exhibited obvious three-stage work hardening characteristics and high workhardening *** evolving dislocation substructure s during uniaxial tensile deformation found that planar slip dominates in both FCC(L12) and B2 phases,and the FCC(L12) phase is easier to deform than the B2 *** post-deformation transmission electron microscopy revealed that the sub-structural evolution of the FCC(L12) phase is from planar dislocations to bending dislocations,high-density dislocations,dislocation network,and then to dislocation walls,and Taylor lattices,while the sub-structural evolution of the B2 phase is from a very small number of short dislocations to a number of planar ***,obvious ductile fracture in the FCC(L12) phase and a brittle-like fracture in the B2 phase were observed on the fracture surface of the Al0.9CoFeNi2 *** re search results provide some insight into the microstructure-property relationship.

关键词： Eutectic high-entropy alloy Microstructure Mechanical properties Deformation behavior

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Significant Promotion of Interlayer Ion Diffusion for Mos2 /Mobs Heterostructure as High Performance Li/Na Ion Batteries Anode Material

SSRN

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SSRN 2024年

作者： Chen, Jian Kang, Yao Wang, Xudong Huang, Hao Yao, Man Key Laboratory of Energy Materials and Devices Liaoning China School of Materials Science and Engineering Dalian University of Technology Dalian116024 China Key Laboratory of Solidification Control and Digital Preparation Technology Dalian University of Technology Liaoning Dalian116024 China

As a member of the new two-dimensional materials family, functionalized MoB (MBene) attracts great interest as energy storage materials due to their excellent mechanical properties and metallicity. Here, we aim to leverage the superior properties of MBene to develop new promising electron materials for Li/Na-ion batteries by designing the MoS2 /MoBS heterostructure. Our investigation focuses on the structural stability, mechanical and electrochemical properties by first-principles calculation. The high Young’s modulus, robust structural stability and metallicity prevent the electrode pulverization and guarantee cycle stability of battery. Impressively, the interlayer diffusion barriers of Li and Na atoms are only 0.26 and 0.16 eV, outperforming other MoS2-based heterostructures. With calculated open circuit voltage of 0.01-1.83 V for Li atoms and 0.02-1.28 V for Na atoms, the heterostructure is suitable for deployment as an anode material. Besides, the reversible specific capacity (376 mAh/g) of Li atoms is improved by the electron transfer caused by the formation of heterostructure compared to that of monolayer MoS2 (335 mAh/g) and MoBS(193 mAh/g). These findings fully underline the potential of MoS2/MoBS heterostructure as anode material of Li/Na-ion batteries. © 2024, The Authors. All rights reserved.

关键词： Stability

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Ultrasound-Assisted Solidifi cation of a Cu–Cr Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第12期35卷 2082-2088页

作者： Siruo Zhang Huijun Kang Min Cheng Zongning Chen Zhicheng Wang Enyu Guo Jiehua Li Tongmin Wang Key Laboratory of Solidifi cation Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Ningbo Institute of Dalian University of Technology Ningbo 315000China Institute of Casting Research Montanuniversitat Leoben8700LeobenAustria

Ultrasonic cavitation radiates huge power in a small solidifying bulk,leading to significant grain refinement,purification and homogenization of the final *** vibration has mostly been used for treating the solidification of light metals,but it is difficult to directly introduce ultrasonic vibration into copper alloy due to the lack of proper *** this work,we have used a Sialon ceramic sonotrode to propagate acoustic waves in a Cu-Cr alloy *** grain refinement and modification of primary Cr have been *** the ultrasound vibration treatment,the mechanical properties of the as-cast Cu-Cr alloy have been *** wear resistance of the Cu-Cr alloy has also shown enhancement with respect to the untreated alloy.

关键词： Cu-Cr alloys Microstructure Ultrasonic vibration Acoustic cavitation solidification process

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