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microstructure and microhardness of aluminium alloy with underwater and in-air wire-feed laser deposition

International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 670-677页

作者： Ning Guo Qi Cheng Yunlong Fu Yang Gao Hao Chen Shuai Zhang Xin Zhang Jinlong He State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Shandong Provincial Key Laboratory of Special Welding Technology Harbin Institute of Technology at WeihaiWeihai 264209China Shandong Institute of Shipbuilding Technology Weihai 264209China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China China Oil&Gas Pipeline Network Corporation Beijing 100101China

This study carried out the underwater and in-air wire-feed laser deposition of an aluminium alloy with a thin-walled tubular structure. For both the underwater and in-air deposition layers, both were well-formed and incomplete fusion, cracks, or other defects did not *** with the single-track deposition layer in air, the oxidation degree of the underwater single-track deposition layer was slightly *** both the underwater and in-air deposition layers, columnar dendrites nucleated close to the fusion line and grew along the direction of the maximum cooling rate in the fusion region(FR), while equiaxed grains formed in the deposited region(DR). As the environment changed from air to water, the width of DR and height of FR decreased, but the deposition angle and height of DR increased. The grain size and ratio of the high-angle boundaries also decreased due to the large cooling rate and low peak temperature in the water ***, the existence of a water environment benefitted the reduction of magnesium element burning loss in the DR. The microhardness values of the underwater deposition layer were much larger than those of the in-air layer, owing to the fine grains and high magnesium content.

关键词： wire-feed laser deposition microstructure magnesium element burn loss microhardness

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microstructure and mechanical properties of lightweight Ti_(3)Zr_(1.5)NbVAl_(x)(x=0,0.25,0.5 and 0.75) refractory complex concentrated alloys

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Journal of Materials Science & Technology 2022年第35期130卷 64-74页

作者： Shuai Zeng Yongkang Zhou Huan Li Hongwei Zhang Haifeng Zhang Zhengwang Zhu Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Combining high strength and good ductility is an urgent requirement for traditional structural materials,but yet a *** emerging ductile Ti_(3)Zr_(1.5)VNbAl_(x)(x=0,0.25,0.5,0.75) refractory complex concentrated alloys(RCCAs) with high specific strength were designed and synthesized via vacuum *** effects of Al on microstructure and mechanical properties were systematically *** was found that the phase composition in this alloy system changes from the single disordered body-centered cubic(BCC) phase to a nano-scale mixture of co-continuous disordered BCC and ordered B2 phases with the increase of Al *** structure transition results in a remarkable increase in the yield strength of the RCCAs,i.e.,from 790 to 1118 MPa,leading to a superior specific yield strength of 199.4 MPa cm^(3)g^(-1)for the Al0.75 alloy,meanwhile,the tension plasticity maintained at~10%.TEM observation demonstrates that cell-forming structure and HDDWs induced by wave slip play a crucial role of considerable plasticity in Al0.25 alloy,whereas in Al0.5 alloy,microbands induced by planar slip dominant deformation *** current work is important not only for providing novel high strength and tough structural materials with low density,but also sheds light on designing highperformance lightweight alloys with tunable microstructure.

关键词： Refractory complex concentrated alloys microstructure Mechanical properties Strengthening mechanisms Deformation behavior

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microstructure and high temperature fracture toughness of NG-TIG welded Inconel 617B superalloy

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Journal of Materials Science & Technology 2020年第4期39卷 173-182页

作者： Xiaogang Li Kejian Li Shanlin Li Yao Wu Zhipeng Cai Jiluan Pan Department of Mechanical Engineering Tsinghua UniversityBeijing100084China State Key Laboratory of Tribology Tsinghua UniversityBeijing100084China Collaborative Innovation Center of Advanced Nuclear Energy Technology Tsinghua UniversityBeijing100084China Tsinghua University Research Institute for Advanced Equipment Tianjin300304China

In the present study,the microstructure,fracture toughness,and fracture behavior of Inconel 617 B narrow gap tungsten inert gas(NG-TIG)welded joint were investigated systematically at the designed service temperature of 700℃.Fracture toughness(J0.2)of base metal(BM)and heat affected zone(HAZ)was higher than that of weld metal(WM).In HAZ and BM,strain mainly loc alised at grain boundaries with large misorientation and there were lots of coincidence site lattice(CSL)∑3 boundaries related to twins inside grains,which led to the much higher fracture toughness of BM and HAZ than *** high numbers of twins as well as the less serious strain localization at grain boundaries resulted in the most outstanding fracture toughness of BM.

关键词： Nickel alloys Welding Fracture behavior microstructure Misorientation

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microstructure and properties of an Al–Ti–Cu–Si brazing alloy for SiC–metal joining

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International Journal of Minerals,Metallurgy and Materials 2017年第5期24卷 557-565页

作者： Chun-duo Dai Rui-na Ma Wei Wang Xiao-ming Cao Yan Yu School of Materials Science and Engineering Hebei University of Technology Commercial Aircraft Corporation of China Ltd.

An Al–Ti–Cu–Si solid–liquid dual-phase alloy that exhibits good wettability and appropriate interfacial reaction with SiC at 500–600°C was designed for SiC–metal joining. The microstructure, phases, differential thermal curves, and high-temperature wetting behavior of the alloy were analyzed using scanning electron microscopy, X-ray diffraction analysis, differential scanning calorimetry, and the sessile drop method. The experimental results show that the 76.5Al–8.5Ti–5Cu–10Si alloy is mainly composed of Al–Al2Cu and Al–Si hypoeutectic low-melting-point microstructures (493–586°C) and the high-melting-point intermetallic compound AlTiSi (840°C). The contact angle, determined by high-temperature wetting experiments, is approximately 54°. Furthermore, the wetting interface is smooth and contains no obvious defects. Metallurgical bonding at the interface is attributable to the reaction between Al and Si in the alloy and ceramic, respectively. The formation of the brittle Al4C3phase at the interface is suppressed by the addition of 10wt% Si to the alloy. © 2017, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.

关键词： Alloys Aluminum copper alloys Ceramic materials Differential scanning calorimetry Intermetallics Joining Melting point Metals microstructure Scanning electron microscopy Silicon Silicon alloys Silicon carbide Soldering alloys Titanium alloys Wetting X ray diffraction analysis

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microstructure and dry sliding wear behavior of laser clad AlCrNiSiTi multi-principal element alloy coatings

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Rare Metals 2017年第7期36卷 562-568页

作者： Can Huang Yi-Zhou Tang Yong-Zhong Zhang An-Ping Dong Jian Tu Lin-Jiang Chai Zhi-Ming Zhou School of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology Chongqing 400054China Center for Composites General Research Institute forNonferrous MetalsBeijing 100088China Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming Shanghai Jiao Tong UniversityShanghai 200240China

The approximately equimolar ratio A1CrNiSiTi multi-principal element alloy （MPEA） coatings were fab- ricated by laser cladding on Ti-6Al-4V （Ti64） alloy. Scanning electron microscopy （SEM）, equipped with an energy-dispersive spectroscopy （EDS）, and X-ray diffrac- tion （XRD） were used to characterize the microstructure and composition. Investigations show that the coatings consist of （Ti, Cr）5Si3 and NiA1 phases, formed by in situ reaction. The phase composition is initially explicated according to obtainable binary and ternary phase diagrams, and the formation Gibbs energy of TisSi3, VsSi3 and CrsSi3. Dry sliding reciprocating friction and wear tests of the A1CrNiSiTi coating and Ti64 alloy substrate without coating were evaluated. A surface mapping profiler was used to evaluate the wear volume. The worn surface was characterized by SEM-EDS. The hardness and wear resistance of the A1CrNiSiTi coating are well compared with that of the basal material （Ti64）. The main wear mechanism of the AICrNiSiTi coating is slightly adhesive transfer from GCrl5 counterpart, and a mixed layer com- posed of transferred materials and oxide is formed.

关键词： Laser cladding Multi-principal element alloy microstructure Wear behavior

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microstructure,mechanical properties,and corrosion resistance of an explosively welded Mg-Al composite

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Journal of Magnesium and Alloys 2022年第4期10卷 1086-1095页

作者： Mustafa Acarer Bilge Demir Burak Dikici Emin Salur Department of Metallurgical and Materials Engineering Technology FacultySelcuk UniversityKonya 42075Turkey Department of Mechanical Engineering Karabuk UniversityKarabuk 78100Turkey Department of Metallurgical and Materials Engineering Atatürk UniversityErzurum 25240Turkey

In this study,an attempt was made to manufacture an AZ31–Al5005 laminated composite by explosive welding.A mixture of ammonium nitrate(90%),fuel oil(5%),and TNT(5%)was used as the *** detonation velocity of the explosive material was approximately 3100 m•s^(−1).The microstructure and mechanical and corrosion properties of the joint were comparatively *** characterisation of the joint was conducted by optical microscopy(OM),scanning electron microscopy with energy-dispersive spectroscopy(SEM-EDS),high-resolution transmission electron microscopy(HR-TEM),and X-ray diffraction(XRD).The mechanical properties were determined using micro-Vickers hardness,tensile,and Charpy impact *** addition,electrochemical tests were conducted on the AZ31–Al5005 laminated composite and the individual components to determine their corrosion *** corrosion behaviours of the structures were determined in a 3.5%NaCl solution at room temperature using potentiodynamic scanning(PDS).The metallurgical structure and mechanical properties of the joints were within the acceptable limits.

关键词： corrosion welded microstructure

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microstructure and mechanical properties improvements in cemented carbides by(Cr,Mo,Ta)_(2)(C,N) inhibitors

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Rare Metals 2021年第3期40卷 679-686页

作者： Jie Tang Ying Liu Jin-Wen Ye Zhi-Nan Cao Shi-Qing Ma Xiao-Jiao Yang School of Materials Science and Engineering Sichuan UniversityChengdu 610065China Key Laboratory of Advanced Special Material and Technology Ministry of EducationChengdu 610065China

Grain growth inhibitors can effectively suppress the grain size of tungsten carbide(WC),and consequently improve the hardness and strength of the cemented carbides;however,the toughness,one of the most important properties,usually deteriorates with ***,(Cr,Mo,Ta)_(2)(C,N) synthesized by carbothermal reductionnitridation was used as a novel inhibitor,and its effects on the microstructure and mechanical properties of the cemented carbides were *** results showed that the cemented carbides containing(Cr,Mo,Ta)_(2)(C,N)outperformed its counterpart comprising the traditional inhibitors in comprehensive mechanical properties,which was mainly attributed to the better inhibition performance provided by the(Cr,Mo,Ta)_(2)(C,N) solid-solution *** the content of(Cr,Mo,Ta)_(2)(C,N) increasing from 0 wt% to 1.25 wt%,the average grain size of WC in the cemented carbides decreased from 0.85 to 0.60 μm firstly,and then increased to 0.64 μ*** 1.00 wt%(Cr,Mo,-Ta)_(2)(C,N) addition,the cemented carbides with the best performance of hardness(HV_(30)) of 15.55 GPa,transverse rupture strength of 4272 MPa,fracture toughness of13.91 MPa·m1/2 were *** electron backscattered diffraction(EBSD) measurements showed that cemented carbides with(Cr,Mo,Ta)_(2)(C,N) processed more amount of∑2 boundary compared with the other specimens,which contributed to better fracture resistance.

关键词： Cemented carbides microstructure Mechanical properties (Cr,Mo,Ta)_(2)(C,N) Electron backscattered diffraction(EBSD)

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microstructure and mechanical properties of repair welds of low-pressure sand-cast Mg?Y?RE?Zr alloy by tungsten inert gas welding

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Journal of Magnesium and Alloys 2022年第1期10卷 195-209页

作者： Xin Tong Guohua Wu Liang Zhang Yingxin Wang Wencai Liu Wenjiang Ding National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The sand castings of Mg-Y-RE-Zr series alloys are widely utilized in the large scales and complex shapes in the aerospace industry,as a result of which there are always some cast defects in the products. In this study, the feasibility of repair welding of sand-cast Mg-4 Y-3 RE-0.5 Zr alloy by tungsten inert gas(TIG) welding was scrutinized with different welding currents from 150 to 210 A. The results indicated that defect-free repaired joints with good appearance could be acquired at 170 and 190 A. Interestingly, the grain size of the fusion zone(FZ) was refined initially and then increased with the linear increment of welding current. Because at the higher heat inputs, although the cooling rate of the molten pool was reduced, substantial constitutional supercooling for the grain refinement was attained after the Zr particles were transformed into Zr solutes. The tensile strength of the repaired joint at 170 A was 195 MPa with the maximum joint efficiency of 87.8%, and the elongation reached to 124.4% of the sand-cast base material(BM). However, serious grain coarsening and continuous eutectic structures generated in heat-affected zone(HAZ) above 190 A resulted in the weakening of the joint due to the brittle intergranular fracture.

关键词： Sand-cast Mg-Y-RE-Zr alloy Repair welding microstructure Tensile properties Fracture behavior

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microstructure,Corrosion and Mechanical Properties of Medium-Thick 6061-T6 Alloy/T2 Pure Cu Dissimilar Joints Produced by Double Side Friction Stir Z Shape Lap-Butt Welding

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 385-400页

作者： Jiuxing Tang Guoxin Dai Lei Shi Chuansong Wu Sergey Mironov Surendra Kumar Patel Song Gao Mingxiao Wu MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing Shandong UniversityJinan 250061China Laboratory of Mechanical Properties of Nanoscale Materials and Superalloys Belgorod State UniversityBelgorod 308015Russia School of Mechanical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China State Grid Henan Electric Power Research Institute Zhengzhou 450052China

A novel double side friction stir Z shape lap-butt welding(DS-FSZW)process was proposed to achieve excellent mechanical properties of Al/Cu medium-thick dissimilar *** influence of welding parameters on weld microstructure and properties of DS-FSZW joint were systematically *** indicated that defect-free medium-thick Al/Cu DS-FSZW joint could be achieved under an optimal welding ***-FSZW joint was prone to form void defects in the bottom of the second-pass *** recrystallization mechanisms at the top and middle of the weld nugget zone(WNZ)were continuous dynamic recrystallization(CDRX)and geometric dynamic recrystallization(GDRX).While the major recrystallization mechanism at the bottom of the WNZ was ***-FSZW joint of the optimal welding condition with 850 r/min-400 mm/min was produced with a continuous thin and crack-free IMCs layer at the Al/Cu interface,and the maximum tensile strength of this joint is 160.57 MPa,which is equivalent to 65.54%of pure Cu base ***,the corrosion resistance of Al/Cu DS-FSZW joints also achieved its maximum value at the optimal welding parameter of 850 r/min-400 mm/*** demonstrates that the DS-FSZW process can simultaneously produce medium-thick Al/Cu joints with excellent mechanical performance and corrosion resistance.

关键词： DS-FSZW Al/Cu dissimilar joint Corrosion behaviour Intermetallic compounds microstructure Mechanical properties

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microstructure evolution,texture and mechanical properties of a Mg-Gd-Y-Zn-Zr alloy fabricated by cyclic expansion extrusion with an asymmetrical extrusion cavity:The influence of passes and processing route

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Journal of Magnesium and Alloys 2021年第3期9卷 964-982页

作者： Zhaoming Yan Xubin Li Jie Zheng Zhimin Zhang Qiang Wang Kaihua Xu Hongzhi Fan Guanshi Zhang Jiaxuan Zhu Yong Xue School of Materials Science and Engineering North University of ChinaTaiyuan 030051China College of Mechatronics Engineering North University of ChinaTaiyuan 030051China

In the present work,two processing routes(A and B)with 3 CEE-AEC passes are performed on Mg-13 Gd-4 Y-2 Zn-0.4 Zr alloys,and the resultant microstructure evolution,texture analysis and mechanical properties are investigated *** core difference between the two processing routes is the orientation between the expansion and extrusion steps,i.e.,they are parallel to each other for on route A and perpendicular to each other for route *** results show that a remarkable grain refinement is achieved via both processing routes due to dynamic recrystallization(DRX).Fine equiaxed grains are observed in the samples processed with route B with a final size of 3.6±0.4μm compared to the grain size of 4.5±0.5μm with route *** an increasing number of CEE-AEC passes,the overall texture intensity decreases,and the basal texture gradually changes to the mixed texture *** shear deformation introduced by the asymmetrical extrusion cavity promotes a broad angular distribution of the basal planes on routes A and B,leading to an obvious increase in the Schmid factor for the activation of the basal a slip *** tensile test at ambient temperature reveals that the comprehensive mechanical properties are improved,and the conventional mechanical anisotropy of as-received alloys is alleviated by successive CEE-AEC processing,which is mainly derived from the competitive balance relation between the grain refinement and texture modification.

关键词： CEE-AEC Mg-Gd-Y-Zn-Zr microstructure Texture Mechanical properties

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