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学者姓名：宁汉维
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Abstract ：
A multi-layered Al-Cu joint is achieved by vaporizing foil actuator welding (VFAW). The process of welding, tensile properties and microstructure of multi-layered Al-Cu joint are systematically investigated using numerical simulations and experiments. Micro-melting at the welding interface contributes to metallurgical bonding. When the impact velocity exceeds 430 m/s, a larger metallurgical bonding area is created between the two neighbouring sheets, which in turn increases the shear strength of the joint. Comparing to the Cu-Cu interface, the Al-Cu interface forms a distinct waveform because of the differences between the base material in hardness and density. Due to the rapid cooling rate of VFAW, a gradient structure containing nanocrystals and amorphous zone is formed between the matrices and the transition zone.
Keyword ：
interfacial microstructure interfacial microstructure multi-layered Al-Cu joint multi-layered Al-Cu joint numerical simulation numerical simulation vaporizing foil actuator welding vaporizing foil actuator welding
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| GB/T 7714 | Yao, Yujie , Deng, Jianghua , Fan, Zhisong et al. Impact welding process and microstructure of multi-layered Al-Cu joint by vaporizing foil actuator [J]. | MATERIALS SCIENCE AND TECHNOLOGY , 2025 . |
| MLA | Yao, Yujie et al. "Impact welding process and microstructure of multi-layered Al-Cu joint by vaporizing foil actuator" . | MATERIALS SCIENCE AND TECHNOLOGY (2025) . |
| APA | Yao, Yujie , Deng, Jianghua , Fan, Zhisong , Ning, Hanwei , Tang, Weijie . Impact welding process and microstructure of multi-layered Al-Cu joint by vaporizing foil actuator . | MATERIALS SCIENCE AND TECHNOLOGY , 2025 . |
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Abstract ：
As a near-net forming method, the spark plasma sintering (SPS) process could quickly compact the alloys and refine the grains, indicating significant advantage in preparing of precipitation-strengthened superalloy. In this article, the K4202 superalloy was prepared using the SPS process. During sintering, the powders leakage and mold damage occurred when the sintering temperature exceeded 1100 degrees C. To solve this problem, the macroscale model containing sintered body and graphite molds, as well as the microscale model analyzing powder particles, were both calculated under finite element method. Based on the simulation and experimental results, the sintering process was optimized and the mentioned defects were overcome using the adjusted loading curve. In addition, the densification behavior of the alloy has been discussed in detail. It is noted that the local temperature rise is beneficial for the migration of materials and diffusion of atoms, which could facilitate the formation and flattening of sintering necks. The mechanical properties of the prepared alloy were further optimized by heat treatment, and the results show that the large amount of gamma '' phase generated after aging could significantly strengthen the alloy.
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| GB/T 7714 | Wang, Dongjun , Ning, Hanwei , Wu, Beiqing et al. Spark Plasma Sintering Densification Behavior of the K4202 Alloy and Its Mechanical Properties [J]. | METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE , 2025 . |
| MLA | Wang, Dongjun et al. "Spark Plasma Sintering Densification Behavior of the K4202 Alloy and Its Mechanical Properties" . | METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE (2025) . |
| APA | Wang, Dongjun , Ning, Hanwei , Wu, Beiqing , Qin, Shaohua , Liu, Ze , Liu, Gang . Spark Plasma Sintering Densification Behavior of the K4202 Alloy and Its Mechanical Properties . | METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE , 2025 . |
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Over the past decades, the formation mechanisms of adiabatic shear bands under dynamic loading have attracted wide coverage from researchers. This study introduces a novel approach focusing on the transition zones at ASB edge rather than their fully recrystallized center to advance current understanding. These regions can be regarded as transitional stages within the unaccomplished dynamic recrystallization process, thereby demonstrating the accurate evolution. Using electromagnetic riveting processing of commercial 2A10 Al-Cu alloy, we generated ASB (>130 mu m) with distinguishable edge regions exceeding 10 mu m in width. Through microstructure characterization under focused ion beam and kinetic analysis, the direct microscopic evidence of rotational dynamic recrystallization and additional recrystallization mechanisms activated alongside rotational dynamic recrystallization were discovered. The results demonstrate the sequential mechanisms: rotational dynamic recrystallization initiates firstly during deformation, producing ultrafine grains at ASB centers; discontinuous dynamic recrystallization subsequently emerges with localized temperature elevation; continuous dynamic recrystallization requires a longer duration than the deformation process itself, classified as incomplete recrystallization.
Keyword ：
2A10 Aluminum Alloy 2A10 Aluminum Alloy Adiabatic shear bands Adiabatic shear bands Dynamic recrystallization mechanism Dynamic recrystallization mechanism Electromagnetic riveting Electromagnetic riveting Microstructural evolution Microstructural evolution
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| GB/T 7714 | Ning, Hanwei , Lv, Yichao , Yao, Yujie et al. Multiple recrystallization mechanisms of adiabatic shear bands: Observations via electromagnetic force-induced wide-range transition zones [J]. | INTERNATIONAL JOURNAL OF PLASTICITY , 2025 , 191 . |
| MLA | Ning, Hanwei et al. "Multiple recrystallization mechanisms of adiabatic shear bands: Observations via electromagnetic force-induced wide-range transition zones" . | INTERNATIONAL JOURNAL OF PLASTICITY 191 (2025) . |
| APA | Ning, Hanwei , Lv, Yichao , Yao, Yujie , Deng, Jianghua , Gong, Chengpeng , Fan, Zhisong . Multiple recrystallization mechanisms of adiabatic shear bands: Observations via electromagnetic force-induced wide-range transition zones . | INTERNATIONAL JOURNAL OF PLASTICITY , 2025 , 191 . |
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In this study, to overcome the bottleneck of forming NiAl for aerospace applications, a novel combined sintering method based on hot-press sintering, which divides the components into various parts and compacts them gradually, is proposed and studied. Two typical close cross-sectional components (tube -like components and conical tube components with flanges), which are highly demanding and more challenging to obtain for NiAl intermetallic, were prepared and analyzed in detail. Based on these results, both prepared components were fully dense. In addition, as shown by the bending tests, the interfacial strength is between the strengths of the base alloys on the two sides, which confirms the reliable bonding ability achieved by this method. For the conical tube component with flange, the ultimate tensile strength of the combined -sintered part in 1000 degree celsius is 406.7 +/- 3.2 MPa, and the ultimate strength of the pre -sintered part is 368.6 +/- 2.7 MPa, which are 39% and 26% higher than the strength of blade -like component prepared by casting and hot isostatic pressing (292 MPa). The proposed method discussed in our study can overcome the uneven density defects in HPS and achieve collaborative control of both the shape and performance when preparing a high height -to -thickness ratio or a complex -shaped close crosssection component.
Keyword ：
Close cross-section component Close cross-section component Intermetallic compound Intermetallic compound Joining Joining Mechanical properties Mechanical properties NiAl-based alloy NiAl-based alloy Sintering Sintering
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| GB/T 7714 | Ning, Hanwei , Wang, Dongjun , Qin, Shaohua et al. Preparation of the close cross-section component of NiAl-based alloy by a novel combined sintering method [J]. | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY , 2024 , 327 . |
| MLA | Ning, Hanwei et al. "Preparation of the close cross-section component of NiAl-based alloy by a novel combined sintering method" . | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 327 (2024) . |
| APA | Ning, Hanwei , Wang, Dongjun , Qin, Shaohua , Zhao, Jie , Wei, Wenqing , Liu, Gang . Preparation of the close cross-section component of NiAl-based alloy by a novel combined sintering method . | JOURNAL OF MATERIALS PROCESSING TECHNOLOGY , 2024 , 327 . |
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In this work, the vaporizing foil actuator welding (VFAW) has been used for impact welding of aluminum AA1060 to copper T2 sheets. The microstructural feature, mechanical properties, and electrical conductivity of Al-Cu welded joints were investigated. The VFAW process was simulated by LS-DYNA to analyze the effect of impact velocity and angle. The evolution of the microstructure of the welding interface was revealed by smoothed particle hydrodynamics numerical simulation. The qualities of Al-Cu joints were evaluated by microstructure observations, lap shear tensile testing and resistance measurements. The results show that the Al-Cu joints have a flat welding interface at the discharge voltage of 8 kV, but the joints failed at the interface due to the residual Al2O3. Owing to the change in interfacial effective plastic strain and impact pressure, increasing the discharge voltage resulted in the transition of the interface waveform from flat to wavy, and the site of tensile failure changed from the welding interface to the Al base metal. The results of element analysis showed that there was a transition zone consisting of Al-Cu intermetallic compounds at the interface. This transition zone would change from intermittent to continuous and become thicker after increasing the discharge voltage. Variations in discharge voltage can change the resistivity, thickness, and area of the welding region, which in turn affects the joint resistance.
Keyword ：
Al-Cu joint Al-Cu joint electrical conductivity electrical conductivity interface microstructure interface microstructure mechanical property mechanical property vaporizing foil actuator welding vaporizing foil actuator welding
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| GB/T 7714 | Yao, Yujie , Deng, Jianghua , Ning, Hanwei et al. Impact Welding of Aluminum AA1060 and Copper T2 Sheets by Vaporizing Foil Actuator: Microstructure, Mechanical Properties, and Electrical Conductivity [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2024 , 34 (13) : 13218-13228 . |
| MLA | Yao, Yujie et al. "Impact Welding of Aluminum AA1060 and Copper T2 Sheets by Vaporizing Foil Actuator: Microstructure, Mechanical Properties, and Electrical Conductivity" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 34 . 13 (2024) : 13218-13228 . |
| APA | Yao, Yujie , Deng, Jianghua , Ning, Hanwei , Lv, Yichao , Fan, Zhisong . Impact Welding of Aluminum AA1060 and Copper T2 Sheets by Vaporizing Foil Actuator: Microstructure, Mechanical Properties, and Electrical Conductivity . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2024 , 34 (13) , 13218-13228 . |
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Abstract ：
Herein, a novel method is proposed to prepare the multimaterial composite component for aerospace applications using the current sintering. Two representative high-temperature structural materials, the new potential intermetallic NiAl and the widely used Ni-based superalloy K4202, have been employed to achieve the target. As shown by the results, a clean interface with almost no defects is successfully obtained in NiAl/K4202 alloy. Nevertheless, the existence of a continuous Cr(Mo) phase along the region leads to an insufficient bonding ability. To optimize the interfacial microstructure, a Ni foil is employed as the interlayer. The results indicate that the interlayer can hinder the intense diffusion of elements and prevent the abnormal growth of Cr(Mo) phases, which result in a considerable improvement of interfacial properties. A novel method is proposed to prepare NiAl-based intermetallics/K4202 superalloy dissimilar materials using the solid-state sintering-joining method. A clean interface with no defects is obtained in NiAl/K4202 material. Nevertheless, the existence of a continuous Cr(Mo) phase along the region leads to insufficient bonding. A Ni foil is used as the interlayer, which improves the interfacial strength. The relationship between the property and microstructure of the interface has been revealed.image (c) 2023 WILEY-VCH GmbH
Keyword ：
intermetallics intermetallics mechanical properties mechanical properties microstructures microstructures sintering sintering superalloys superalloys
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| GB/T 7714 | Ning, Hanwei , Wang, Dongjun , Qin, Shaohua et al. A Novel Method for Preparing Intermetallics/Superalloy Dissimilar Materials Using Current Sintering of Metallic Powders [J]. | ADVANCED ENGINEERING MATERIALS , 2023 , 25 (23) . |
| MLA | Ning, Hanwei et al. "A Novel Method for Preparing Intermetallics/Superalloy Dissimilar Materials Using Current Sintering of Metallic Powders" . | ADVANCED ENGINEERING MATERIALS 25 . 23 (2023) . |
| APA | Ning, Hanwei , Wang, Dongjun , Qin, Shaohua , Zhao, Jie , Wei, Wenqing , Liu, Ze et al. A Novel Method for Preparing Intermetallics/Superalloy Dissimilar Materials Using Current Sintering of Metallic Powders . | ADVANCED ENGINEERING MATERIALS , 2023 , 25 (23) . |
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