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Coordinated Regulation of Bonding Interfacial Structure and Mechanical Properties of Al/Mg Alloy Composite Plates by Electrically Assisted Rolling

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Chinese Journal of Mechanical Engineering 2025年第1期38卷 246-260页

作者： Tingting Zhang Xingrun An Yan Wang Gongbo Bian Tao Wang College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment of Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan University of TechnologyTaiyuan 030024China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China.

Current research on the fabrication of rolled composite plates primarily focuses on processing and bonding *** with hot-rolling technology,the electrically assisted rolling process has demonstrated excellent performance in interfacial bonding ***,the influence of different current loading modes on the interfacial recombination process of composite panels varies *** this study,low-frequency electrically assisted rolling was used in the first pass to pre-bond a composite plate at a low reduction rate of 15%.High-frequency electrically assisted rolling was used during the second pass,and Al/Mg alloy composite plates were *** interfacial microstructure and mechanical properties of the composite plate were coordinated regulation by designing the rolling reduction *** results showed the interfacial morphology of the alternating distribution of the melt-diffusion layer,diffusion layer,and the formation of a new Al/Mg bonding *** the melt-diffusion interface,the irregular intermetallic compounds(IMCs)and the new Al/Mg bonding interface were alternately distributed,and the IMCs contained theα-Mg,Mg17Al12,and Mg2Al3 *** addition,an extremely high shear strength of 78.26 MPa was *** of the Mg alloy matrix was observed on the fracture surface of the Al alloy *** high shear strength was mainly attributed to the formation of a unique interfacial structure and the appearance of a melt-diffusion *** to the diffusion-reduction interface,the regular rectangular IMCs and the new Al/Mg bonding interface were alternately distributed,and the IMCs consisted of the Mg17Al12 and Mg2Al3 *** shear test results showed that the shear strength of the interface reached 68.69 MPa,and a regular distribution of the Mg alloy matrix with dimples and the Al alloy matrix with a necking zone was observed on the fracture surface of the Al *** strength test results revealed a maximum value of

关键词： Al/Mg alloy composite plate Electrically assisted rolling Bonding properties Interfacial structure

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Effect of two-pass rolling of textured roll and polished roll on surface topography and mechanical properties of 316L stainless steel ultra-thin strip

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Journal of Iron and Steel Research International 2025年第1期32卷 186-197页

作者： Zeng-qiang Zhang Xi Liao Zhong-kai Ren Zhen-hua Wang Ya-xing Liu Tao Wang Qing-xue Huang College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment of Ministry of Education Taiyuan University of TechnologyTaiyuan030024ShanxiChina National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan University of TechnologyTaiyuan030024ShanxiChina Shanxi TISCO Stainless Steel Precision Strip Co. Ltd.Taiyuan030032ShanxiChina

The textured roll and polished roll were applied instead of the ground roll in a 20-high mill to conduct two-pass rolling of 316L stainless steel strip with thickness of 0.027 *** the two-pass rolling with the textured roll and polished roll(TPR),the surface roughness of the strip is dramatically reduced,and the surface topographical anisotropy index is diminished to 30.9%of the initial *** with the strip rolled using the ground roll in both passes(GGR),the elongation of TPR rolled strip is obviously improved,and the mechanical property anisotropy is greatly *** anisotropy index of tensile strength and elongation are 42.58%and 52.59%of that of GGR rolled strip,which is mainly attributed to the significant decrease of the texture intensity of the strip by TPR *** results indicate that TPR process can obtain the stainless steel ultra-thin strip with smooth and uniform surface topography and good mechanical properties.

关键词： Textured roll Polished roll Surface topography Mechanical property Stainless steel ultra-thin strip

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Enhanced strength-ductility synergy of Mg/Al laminate by coordinating the strain gradient of constituting layers

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Journal of Materials Science and technology 2025年 233卷 264-279页

作者： Qian, Lihua Chen, Liang Tang, Jianwei Li, Yefei Zhang, Cunsheng Kong, Xiangshan State key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan250061 China Shandong University Jinan250061 China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an710049 China School of Mechanical Engineering Xinjiang University Urumqi830047 China

Mg/Al laminate with ZK60Mg and TiB2/6061Al as constitute layers was fabricated through the porthole die co-extrusion and hot rolling. The effects of rolling and roll temperatures on the microstructure, interfacial structure, mechanical properties, and crack propagation paths were studied. The results show that the intermetallic compounds layer shows an intermittent form. The strong strain/dislocation hardening ability of Mg/Al laminate is attributed to the coupled effects of interlocking Al/β interface, strain gradient, and β layer with nanotwins and stacking faults. The complex dislocation structures such as network, loop, and array are found in the Al layer. Dislocation slip is the main deformation mode of the Al layer, while dislocation slip and dynamic recrystallization are the main deformation modes of the Mg layer. As roll temperature increases, prismatic 〈a〉 slip replaces the basal 〈a〉 slip as the most important slip mode. At a rolling temperature of 400 °C and a roll temperature of 150 °C, an optimal synergy of mechanical properties is achieved, with ultimate tensile strength, shear strength, and elongation of 262.1 MPa, 36.4 MPa, and 18.1 %, respectively. As the rolling temperature increases, the fracture mode of Mg/Al laminate changes from discontinuous plastic shrinkage to transverse and longitudinal cracks. With increasing the roll temperature, the through cracks tend to form, indicating the plasticity and bonding quality of Mg/Al laminate are effectively enhanced. © 2025

关键词： Dynamic recrystallization

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Numerical Simulation and Experimental Investigation on Friction and Lubrication Behaviors of Chevron Micro-Textured Valve Plate/Cylinder Block Interface With Various Area Densities

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Journal of Tribology 2025年第7期147卷 072201页

作者： Chen, Luanxia Liu, Zhanqiang Huang, Haihong Zhu, Yingying School of Mechanical Engineering Hefei University of Technology Hefei230009 China Key Laboratory of Green Design and Manufacturing of Mechanical Industry Hefei University of Technology Hefei230009 China School of Mechanical Engineering Shandong University Jinan250061 China State Key Laboratory for High-end Equipment and Advanced Technology of Metal Forming Shandong University Jinan250061 China

As the critical friction pairs of swashplate-type axial piston pumps, the cylinder block/valve plate lubricating interface is the primary source of friction, wear, and leakage in axial piston pumps. Surface micro-texturing has been widely employed in cylinder block/valve plate conjunctions to ameliorate tribological performance. However, little research has been conducted to investigate the influence of chevron micro-texture area density on the tribological behaviors and lubricating properties of cylinder block/valve plate interface both experimentally and numerically. In this article, the chevron micro-textures with various area densities were manufactured on H62 brass by micro-milling and subsequently characterized with a laser scanning confocal microscope (LSCM). The friction and wear performance of H62 brass/38CrMoAl conjunctions were obtained via disc-on-disc tribological tests to simulate the cylinder block/valve plate lubricating interface. Moreover, the load-carrying capacity of untextured and chevron micro-textured samples was numerically investigated under hydrodynamic lubrication. It was found that the chevron micro-textured surface with an area density of 30.1% displayed the lowest friction coefficient and the shallowest wear depth. Although the load-carrying capacity of chevron micro-textured samples with a high dimple area density was larger, the severe stress concentration induced by the reduced micro-texture spacing caused the increment and large fluctuations of friction coefficient. Copyright © 2024 by ASME.

关键词： Friction

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稀有金属材料与工程 2025年第2期54卷 311-318页

作者： Zhang Wenxin Zhang Xiankun Shi Lei Li Shengli Jiang Yuanning Wu Chuansong State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong UniversityJinan 250061China Key Laboratory for Liquid-Solid Structure Evolution&Processing of Materials Ministry of EducationShandong UniversityJinan 250061China

Friction stir lap welding of AA2195 Al-Li alloy and Ti alloy was conducted to investigate the formation,microstructure,and mechanical properties of the *** show that under different welding parameters,with the decrease in welding heat input,the weld surface is *** Ti/Al joint interface is flat without obvious Ti and Al mixed structure,and the hook structure is not formed under optimal *** to the enhanced breaking effect of the stirring head,the hook structural defects and intermetallic compounds are more likely to form at the Ti/Al interface at high rotational speed of 1000 r/min,thereby deteriorating the mechanical properties of *** the heat input is beneficial to hardness enhancement of the aluminum alloy in the weld nugget *** the optimal parameters of rotation speed of 800 r/min and welding speed of 120 mm/min,the maximum tensile shear strength of joint is 289 N/mm.

关键词： Ti/Al dissimilar welding friction stir lap welding Ti alloy Al-Li alloy interface bonding mechanical property

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Effect of rolling schedules on ridging resistance of ultra-thin ferritic stainless steel foil

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Journal of Iron and Steel Research International 2025年第1期32卷 198-214页

作者： Jing-wei Zhao Qing-zhong Xie Li-nan Ma Cun-long Zhou Zheng-yi Jiang Xi Liao Xiao-guang Ma College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of EducationTaiyuan030024ShanxiChina National Key Laboratory of Metal Forming Technology and Heavy Equipment Ministry of Science and TechnologyTaiyuan030024ShanxiChina School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuan 030024ShanxiChina School of Mechanical MaterialsBiomedical and Mechatronic EngineeringUniversity of WollongongWollongongNSW2522Australia Shanxi Taigang Stainless Steel Precision Strip Co. Ltd.Taiyuan 030006ShanxiChina

The effect of rolling schedules on the ridging resistance of ultra-thin ferritic stainless steel(FSS)430 foil was evaluated by studying the microstructure and *** results show that specimens processed with three-pass cold rolling under the reductions of 40%,40%and 31%,respectively,exhibit improved ridging resistance owing to the microstructural refinement and the texture structure optimization.A nearly 40%reduction of ridging height can be achieved using the proposed rolling schedule compared to the other two rolling *** addition,the effect of annealing temperature after cold rolling on the ridging resistance of FSS 430 foil is also found to be crucial,and an optimal annealing temperature of 900℃ is obtained for FSS 430 foil with high ridging ***,the improvement in the ridging resistance of FSS 430 foil can be attributed to the reduction in the fraction of{001}<110>and{114}<110>components by optimization of the rolling and annealing processes.

关键词： Ferritic stainless steel foil Ridging Cold rolling Annealing Microstructure Texture

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Finite element simulation of wear-resistant steel ball forging process 5

Finite element simulation of wear-resistant steel ball forgi...

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2024 5th International Conference on advanced Materials and Intelligent Manufacturing, ICAMIM 2024

作者： Pan, Peng Ge, Feng Yang, Ming Yu, Jinxi Zuo, Lingli Beijing National Innovation of Lightweight Ltd. Beijing101400 China State Key Laboratory for Advanced Forming Technology and Equipment China Academy of Machinery and Technology Beijing101400 China

Deform-3D software was used to analyse the forming characteristics of wear-resistant steel balls, material fluidity, stress-strain distribution, load-time curve, and break coefficient of three kinds of forging billets in the forging process. It was concluded that with the reduction of the height of the original billet, the damage coefficient of the middle position of the billet decreased during the final stage of billet forming. The forging ratio of the blank should be appropriately reduced to reduce the risk of forming defects in the forging process. 2025 Published under licence by IOP Publishing Ltd.

关键词： Billets (metal bars)

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Study on the Uniformity Criterion of Homogenization for W-Mo Superalloys

Study on the Uniformity Criterion of Homogenization for W-Mo...

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Chinese Materials Conference 2024, CMC 2024

作者： Guo, Xulong Zhou, Yang Qi, Huiling Jiang, Shichuan Xiao, Dongping Chengdu Advanced Metal Materials Industrial Technology Institute Co. Ltd. Chengdu610300 China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan114009 China

In order to establish the homogenization criteria for superalloys containing W and Mo, this paper took GH5188 (containing W), GH4141 (containing Mo), and GH3128 (containing W and Mo) alloys as examples for research and analysis. Firstly, the microstructure and elemental segregation of the alloy after heat treatment with different homogenization regimes were observed using a desktop scanning electron microscope (SEM) and a field emission electron probe microanalyser. Secondly, the theoretical and actual segregation coefficients of the alloy elements after heat treatment with different homogenization regimes were calculated using the Jmatpro thermodynamic software and electron probe. The difference between theoretical and actual segregation coefficients was used to determine whether the elements were completely diffused, and the homogenization criteria for the alloy was obtained. Finally, the plasticity and physical properties of alloys after different homogenization treatments were measured using a Gleeble3800 thermomechanical simulator, a Qness Q30A+fully automatic high-precision microhardness tester, and an electronic high-temperature creep tester. The accuracy of the homogenization criterion was verified by comparing the numerical changes under different conditions. Results indicated that for alloys containing only W, W achieved complete diffusion when K′ ≤ 5%;for alloys containing only Mo, Mo achieved complete diffusion when K′ ≤ 10%;and for alloys containing both W and Mo, the elements achieved complete diffusion when K′ ≤ 10%. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Molybdenum alloys

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Towards ultrasonic welding of robust thermoplastic composite joints without the use of energy directors

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Composites Part B: Engineering 2025年 302卷

作者： Wang, Xuemin Quan, Dong Liu, Jiaming Yue, Dongsheng Pan, Jiaying Zhao, Guoqun State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Shandong Jinan250061 China Shandong University Shandong Jinan250061 China

The development of an advanced ultrasonic welding process for thermoplastic composites (TPCs) without the usage of energy directors (EDs) represents a significant challenge and a highly desirable innovation for aerospace applications. A major obstacle in ED-less ultrasonic welding is the non-uniform heat generation and distribution at the welding interface, leading to inconsistent weld quality. This study addressed this challenge by introducing a novel strategy of co-consolidating an extra resin layer (eRL) onto the CF/PEI surfaces prior to the welding. The results demonstrated that applying eRLs with an optimal thickness on the CF/PEI adherends enhanced heat generation efficiency and ensured sufficient melt flow at the welding interface, while effectively eliminating carbon fibre squeeze-out. This approach significantly improves weld uniformity and mechanical performance, achieving a maximum lap-shear strength of 43.2 MPa. Overall, the incorporation of eRLs offers a promising pathway for the cost-effective, high-quality ultrasonic welding of large-scale and complex TPC structures without the usage of EDs. © 2025 Elsevier Ltd

关键词： Ultrasonic welding

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Ultrasonic welding of thermoplastic composites with woven mesh energy directors: Enhanced strength and hygrothermal resistance

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Journal of Materials Research and technology 2025年 36卷 9699-9712页

作者： Dongsheng Yue Guoqun Zhao Jiaying Pan Jiaming Liu Dong Quan State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan Shandong 250061 China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University Jinan Shandong 250061 China

In ultrasonic welding of thermoplastic composites, energy directors (EDs) based on thermoplastic films often exhibit low heat generation efficiency and uneven temperature distribution at the welding interface, which negatively affect weld quality and joint strength. To address these limitations, this study introduces a novel plain-woven mesh ED for the ultrasonic welding of carbon fiber-reinforced PPS (CF/PPS) composites. The influence of welding amplitude and displacement on the welding process and joint quality was systematically investigated based on a single-lap shear test. Additionally, the moisture absorption behavior and mechanical performance degradation, and failure mechanisms of welded joints exposed to hydrothermal environments were also investigated. The results demonstrate that the uniform distribution of filament crossings and open areas in the mesh ED significantly enhances its deformation capability under ultrasonic vibration, leading to improved heat generation efficiency and more uniform temperature distribution at the welding interface. As a result, superior weld quality was achieved. By optimizing process parameters, a low defect level of 1.1 % and a maximum shear strength of 32.6 MPa was obtained for the welded joints. Furthermore, after aging at 80 °C and 95 % relative humidity for 12 weeks, the joint strength remained unchanged, demonstrating exceptional resistance to hygrothermal aging. These findings highlight the potential of mesh ED to overcome the limitations of traditional film-type ED, significantly enhancing both the performance and durability of ultrasonic-welded thermoplastic composite joints.

关键词： Thermoplastic composites (TPCs) Ultrasonic welding Energy director (ED) Environmental degradation Welding/joining

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