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激光增材制造Al_(x)CoCrFeNi高熵合金的组织与性能

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材料工程 2024年第1期52卷 220-230页

作者：于丽莹王晨朱礼龙张华黄海亮阮晶晶张尚洲江亮周鑫烟台大学精准材料高等研究院山东烟台264005 中南大学粉末冶金国家重点实验室长沙410083

为了研究Al含量对FeCoCrNi合金组织性能的影响,采用多路送粉激光熔覆设备高通量制备Al_(x)CoCrFeNi高熵合金(0≤x≤0.9),通过X射线衍射仪、金相显微镜、扫描电子显微镜、电子探针和显微硬度计测试合金的相组成、显微组织结构、成分和硬... 详细信息

为了研究Al含量对FeCoCrNi合金组织性能的影响,采用多路送粉激光熔覆设备高通量制备Al_(x)CoCrFeNi高熵合金(0≤x≤0.9),通过X射线衍射仪、金相显微镜、扫描电子显微镜、电子探针和显微硬度计测试合金的相组成、显微组织结构、成分和硬度。结果表明:随着Al含量的增加,Al_(x)CoCrFeNi高熵合金由单一FCC相(x≤0.35)转变为FCC+BCC双相结构(0.35

关键词：激光熔覆高熵合金 Al_(x)CoCrFeNi 相组成微观组织

维普期刊数据库博看期刊

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化学还原法制备银粉及其在导电胶中的应用

电镀与精饰 2024年第9期46卷 102-107页

作者：崔振国秦松马丽杰张尚洲宋曰海烟台大学核装备与核工程学院山东烟台264000

研究化学还原法制备银粉过程中Ag~+浓度、还原液滴加方式、分散体系对银粉形貌的影响机理,获得一款适合用于导电胶制备的银粉。采用硝酸银为银源,分别以明胶、阿拉伯树胶以及聚乙烯吡咯烷酮(简称PVP)和明胶混合体系作为分散剂,研究不同... 详细信息

研究化学还原法制备银粉过程中Ag~+浓度、还原液滴加方式、分散体系对银粉形貌的影响机理,获得一款适合用于导电胶制备的银粉。采用硝酸银为银源,分别以明胶、阿拉伯树胶以及聚乙烯吡咯烷酮(简称PVP)和明胶混合体系作为分散剂,研究不同分散体系对银粉形貌及粒径等性能。结果表明银粉粒径随着溶液中Ag~+浓度升高呈现变大趋势;不同分散体系制备的银粉形貌差别较大,而粒径差别不大。以明胶为分散剂制备的银粉为规则的球状,以阿拉伯树胶为分散剂制备的银粉为规则的片簇状,以PVP和明胶混合体系作为分散剂制备的银粉形貌为球状与片状的混合。还原液加入方式对银粉粒径也有较大影响,以一次加入方式制备的银粉粒径分布范围较大。此外,银粉粒径随反应温度升高呈现逐渐变大的趋势。通过对比发现最适合用于导电胶制备的银粉为用以阿拉伯明胶单分散体系制备的球状银粉。化学还原法制备银粉过程中,溶液中Ag^(+)浓度、还原液滴加方式以及分散体系均对银粉形貌和粒径有不同程度的影响,用不同形貌的银粉制备导电胶时的体积电阻率有差别。

关键词：银粉形貌和粒径分散体系导电胶体积电阻率

Microstructural evolution during aging of Ti-10V-2Fe-3Al titanium alloy

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Journal of University of Science and Technology Beijing 2007年第4期14卷 335-340页

作者： Bo Wang Ziquan Liu Yuan Gao shangzhou zhang Xiaoyan Wang School of Environmental and Materials Engineering Yantai University Yantai 264005 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The development of microstructure during the aging of Ti-10V-2Fe-3A1 alloy in the 13 and （α＋β） solution-treated and quenched conditions was investigated. The results showed that the isothermal holding below 400℃ yielded homogeneously distributed, spherical ω-phase particles. Fine α aggregates are formed uniformly within 13 grains by nucleating at at particles or β/ω interfaces. At higher temperatures, thin martensite plates decomposed in water-quenched condition. The formation of ω phase was avoided and coarse coarse α-phase plates directly precipitated from the 13 matrix. The highest hardness values were found when the alloys were aged at 400℃ for 8 h. The significance of the observations was discussed in terms of the effect of aging on the precipitations and property.

关键词： beta titanium alloy microstructure aging precipitation property

Growth Behavior of a Phase in ***-0.35Si-0.7Nd Titanium Alloy

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Journal of Materials Science & Technology 2006年第4期22卷 459-464页

作者： shangzhou zhang Yuan GAO Guodong WANG Yuyin LIU Rui YANG School of Environmental and Materials Engineering Yantai University Yantai 264005 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The thermal stability of the microstructure of a near-α titanium alloy after aging at 750℃ was investigated using optical microscope and transmission electron microscope as well as composition analysis. Aging treatment brings about significant coarsening of grain boundary α and α platelets within the colonies for martensitic microstructure. The observed changes are related to the growth steps or ledges of the interface and lamellar termination presented in the microstructure. The composition analysis of the coarsened α plate is consistent with the growth kinetics. The α Widmanstaetten plates were coarsened due to the movement of α /β interface for Widmanstaetten microstructure, and the phase boundaries of primary α（αp） phase directly moved into the transformed β for bimodal microstructure.

关键词： Near-α titanium alloy Microstructure Coarsening Aging

Microstructural Evolution of Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-0.7Nd Titanium Alloy with Carbon Additions

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Journal of Materials Science & Technology 2006年第5期22卷 616-620页

作者： shangzhou zhang Yuan GAO Ziquan LIU Yuyin LIU Rui YANG School of Environment and Materials Engineering Yantai University Yantai 264005 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The effect of carbon addition on microstructural evolution was studied in a near-α titanium alloy （Ti-5.6Al- 4.8Sn-2Zr-1Mo-0.35Si-0.7Nd）. It was found that flake and ribbon titanium carbides with a NaCl crystal structure formed in the as-cast alloys with carbon additions of over 0.17 wt pct. Flake carbide particles are the product of eutectic transformation and precipitate from the high-temperature β phase. The ribbon carbide particles are primary phases formed prior to the nucleation of any metallic phases. The as-cast alloys with carbide precipitation after heat-treatment at βt-30℃ followed by water quenching showed the spheroidization of α lamellae and partial dissolution of carbide particles. After annealing at βt＋15℃, carbide particles are mostly distributed at the grain boundary and spheroidized through mixed grain boundary plus bulk diffusions.

关键词： Titanium alloy Carbon Microstructure Heat treatment Carbide

Longitudinal Compression Behavior of Functionally Graded Ti–6Al–4V Meshes

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Journal of Materials Science & Technology 2016年第11期32卷 1098-1104页

作者： shangzhou zhang Cong Li Wentao Hou Shuo Zhao Shujun Li School of Environmental and Materials Engineering Yantai University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

The compressive deformation behavior in the longitudinal direction of graded Ti–6Al–4V meshes fabricated by electron beam melting was investigated using experiments and finite element methods（FEM）.The results indicate that the overall strain along the longitudinal direction is the sum of the net strain carried by each uniform mesh constituent and the deformation behavior fits the Reuss model well. The layer thickness and the sectional area have no effect on the elastic modulus, whereas the strength increases with the sectional area due to the edge effect of each uniform mesh constituent. By optimizing3 D graded/gradient design, meshes with balanced superior properties, such as high strength, energy absorption and low elastic modulus, can be fabricated by electron beam melting.

关键词： Graded Ti–6Al–4V meshes Electron beam melting Reuss model Compressive deformation Edge effect

Experimental and numerical investigations on fatigue behavior of aluminum alloy 7050-T7451 single lap four-bolted joints

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Journal of Materials Science & Technology 2018年第7期34卷 1205-1213页

作者： Xiaomei Liu Hao Cui shangzhou zhang Haipo Liu Gaofeng Liu Shujun Li School of Fmvironmental and Materials Engineering Yantai University Yantai 264005 China Oriental Bluesky Titanium Technology Co. LTD. Yantai 264005 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The fatigue behavior of aluminum alloy 7050-T7451 single lap four-bolted joints was studied by high- frequency fatigue test and finite element （FE） methods. The fatigue test results showed that a better enhancement of fatigue life was achieved for the joints with highlocked bolts by employing the combinations of cold expansion, interference fit, and clamping force. The fractography revealed that fatigue cracks propagated tortuously; more fatigue micro-cliffs, tearing ridges, lamellar structure were observed, and fatigue striation spacing was simultaneously reduced. The evaluation of residual stress conducted by FE methods confirmed the experimental results and locations of fatigue crack initiation. The extension of fatigue lives can be attributed to the evolution of fatigue damage and effect of beneficial compressive residual stresses around the hole, resulting in the delay of crack initiation, crack deflection, and plasticityinduced crack closure.2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： 7050 aluminum alloy Bolted joint Fatigue behavior Finite element analysis Residual stress

Finite element analysis of temperature and residual stress profiles of porous cubic Ti-6Al-4V titanium alloy by electron beam melting

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Journal of Materials Science & Technology 2020年第9期44卷 191-200页

作者： Xiaochun He Yang Li Yongjie Bi Xiaomei Liu Bing Zhou shangzhou zhang Shujun Li School of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai 264005China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The temperature and stress profiles of porous cubic Ti-6Al-4V titanium alloy grids by additive manufacturing via electron beam melting(EBM)based on finite element(FE)method were ***-dimensional FE models were developed to simulate the single-layer and five-layer girds under annular and lateral *** results showed that the molten pool temperature in five-layer girds was higher than that in single-layer grids owing to the larger mass and higher heat *** energies accumulated by the longer scanning time for annular path than lateral path led to the higher temperature and steeper temperature *** thermal stress drastically fluctuated during EBM process and the residual stress decreased with the increase of powder layer where the largest stress appeared at the first layer along the build *** stress under lateral scanning was slightly larger but relatively more homogeneous distribution than those under annular *** stress distribution showed anisotropy and the maximum Von Mises stress occurred around the central *** stress profiles were explained by the temperature fields and grids structure.

关键词： Electron beam melting Ti-6Al-4V titanium alloy Porous cubic grids Finite element analysis Temperature field Stress field

Effect of Extrusion Combination Types on Microstructure and Mechanical Properties of the AZ31/GW103K Bimetallic Composite Plates

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Acta Metallurgica Sinica(English Letters) 2022年第12期35卷 1959-1972页

作者： Yunpeng Meng Boyu Lin Lifei Wang Jianfeng Fan shangzhou zhang Liwei Lu Hans Jφrgen Roven Hua zhang Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China Institute for Advanced Studies in Precision Materials Yantai UniversityYantai 264005China Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material Hunan University of Science and TechnologyXiangtan 411201China Department of Materials Science and Engineering Norwegian University of Science and Technology7491 TrondheimNorway

The AZ31/GW103 K bimetallic composite plates were prepared by co-extrusion of different combination types(sandwich extrusion type and double semicircle extrusion type),and effects of different extrusion combination types on the microstructure and mechanical properties of bimetallic composite plates were systematically *** results show that both the AZ31/GW103 K bimetallic composite plates prepared by different extrusion combination types have good metallurgical bonding,and changing the combination type does not affect the thickness of the interfacial transition layer of composite *** with the monolithic AZ31 and GW103 K extruded plates,co-extrusion can promote the dynamic recrystallization(DRX)of AZ31 and GW103 K components in composite plates,and double semicircular extrusion type has a better promotion effect on the DRX than sandwich extrusion *** addition,the texture of AZ31 in both monolithic AZ31 and AZ31/GW103 K/AZ31(A/G/A)plates is a typical(0002)basal texture,while that in the AZ31/GW103 K(A/G)composite plate shifts to the tangent direction(TD)of extruded *** with the monolithic AZ31 extruded plate,both the yield strength and tensile strength of A/G and A/G/A bimetallic composite plates are significantly *** strength of A/G/A composite plate is higher than that of A/G composite plate,but its elongation is ***,co-extrusion reduces the dislocation density of AZ31 and GW 103 K components in composite plates,and different extrusion combination types also affect the dislocation density.

关键词： Bimetallic composite plates Extrusion combination types Dynamic recrystallization Dislocation density Mechanical behavior