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Anomalous ductility-strength synergy occurred after cold rolling in a high Gd content Mg alloy

材料科学技术（英文版） 2025年第4期207卷 177-190页

作者： Ning Lv Lingyu Zhao Hong Yan Boyu Liu Rongshi Chen Zhiwei Shan 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 School of Materials Science and Engineering Shenyang Ligong UniversityShenyang 110159China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Center for Advancing Materials Performance From the Nanoscale(CAMP-Nano)& Hysitron Applied Research Center in China(HARCC) State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an 710049China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

During cold rolling in magnesium(Mg)alloys,there will always be serious ductility deterioration,which greatly restricts the application of this processing *** this work,ductility-strength synergy oc-curred after cold rolling was carried out on a(0001)fiber textured Mg-17.5Gd-Zr alloy(wt.％).The ductility-strength synergy can be mainly attributed to texture randomization,microstructure refinement,and easier basal slip transfer condition in the twinned ***,the activation of multiple twinning behaviors,i.e.,{10-12},{10-11},and {11-21} twinning,and related twin-twin interaction restrict the formation of strong basal texture and facilitate the texture ***,profuse high-angle grain boundaries form through dislocation-twin interaction,twin-twin interaction,and dislocation inter-action,which promote microstructure ***,the basal slip transfer becomes easier in the twinned grains owing to the activation of multiple twinning behaviors and their ***-tion of {11-21} twinning anddislocations and the<0001>fiber texture which is favorable for multiple twinning activating during cold rolling are considered to be the key roles for microstructure and texture optimization.

关键词： Ductility-strength synergy {11-21} twin Cold rolling Texture Mg alloys

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Laser shock processing of titanium alloys:A critical review on the microstructure evolution and enhanced engineering performance

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材料科学技术（英文版） 2025年第6期209卷 262-291页

作者： Qian Liu Shuangjie Chu Xing Zhang Yuqian Wang Haiyan Zhao Bohao Zhou Hao Wang Genbin Wu Bo Mao School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Baoshan Iron & Steel Cooperation Limited Shanghai 201900China School of Mechanical and Electric Engineering Soochow UniversitySuzhou 215100China Department of Mechanical Engineering University of Nevada-RenoReno 89557USA School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Baowu Special Metallurgy Cooperation Limited Shanghai 201900China Shanghai Engineering Research Center of Laser Intelligent Manufacturing Shanghai Institute of Laser Technology Co.Ltd.Shanghai 200233China Department of Orthopaedic Surgery Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China

Titanium(Ti)and its alloys are frequently utilized as critical components in a variety of engineering ap-plications because of their high specific strength and excellent corrosion *** to conven-tional surface strengthening technologies,laser shock peening(LSP)has increasingly attracted attention from researchers and industries,since it significantly improves the surface strength,biocompatibility,fa-tigue resistance,and anti-corrosion ability of Ti and its *** numerous studies that have been carried out to elucidate the effects of LSP on microstructural evolution and mechanical properties of Ti and its alloys in recent years,a comprehensive review of recent advancements in the field of Ti and its alloys subjected to LSP is still *** this review,the standard LSP and the novel process designs of LSP assisted by thermal,cryogenic,electropulsing and magnetic fields are discussed and *** evolution,with focuses on the dislocation dynamics,deformation twinning,grain refine-ment and surface amorphization,during LSP processing of Ti alloys is ***,the en-hanced engineering performance of the LSP-processed(LSPed)Ti alloys,including surface hardness,wear resistance,fatigue life and corrosion resistance are ***,this review concludes by present-ing an overview of the current challenges encountered in this field and offering insights into anticipated future trends.

关键词： Laser shock peening Titanium alloys Microstructure evolution mechanical properties

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Bio-Inspired Ionic Sensors: Transforming Natural Mechanisms into Sensory Technologies

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Nano-Micro Letters 2025年第8期17卷 67-94页

作者： Kyongtae Choi Gibeom Lee Min-Gyu Lee Hee Jae Hwang Kibeom Lee Younghoon Lee Department of Mechanical Engineering Kyung Hee University1732 Deogyeong-daeroGiheung-guYonginGyeonggi-do 17104Republic of Korea Department of Mechanical Engineering Gachon University1342 Seongnam-daeroSujeong-guSeongnamGyeonggi-do 13120Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Mechanical Design Engineering Kumoh National Institute of Technology61 Daehak-roGumiGyeongsangbuk-do 39177Republic of Korea

Many natural organisms have evolved unique sensory systems over millions of years that have allowed them to detect various changes in their surrounding *** systems feature numerous receptors—such as photoreceptors,mechanoreceptors,and chemoreceptors—that detect various types of external stimuli,including light,pressure,vibration,sound,and chemical *** stimuli are converted into electrochemical signals,which are transmitted to the brain to produce the sensations of sight,touch,hearing,taste,and *** by the biological principles of sensory systems,recent advancements in electronics have led to a wide range of applications in artificial *** the current review,we highlight recent developments in artificial sensors inspired by biological sensory systems utilizing soft ionic *** versatile characteristics of these ionic materials are introduced while focusing on their mechanical and electrical *** features and working principles of natural and artificial sensing systems are investigated in terms of six categories:vision,tactile,hearing,gustatory,olfactory,and proximity ***,we explore several challenges that must be overcome while outlining future research directions in the field of soft ionic sensors.

关键词： Sensors Iontronics Soft materials Biomimetics

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Design and development of an integrated enset processing machine suitable for central highland farmers of west shewa zone Ethiopia

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Discover Agriculture 2025年第1期3卷 1-26页

作者： Jima, Beka Adugna Kolhe, Kishor Purushottam Jiru, Moera Gutu Agricultural Machinery Engineering Program Department of Mechanical Engineering School of Mechanical Chemical and Materials Engineering at Adama Science and Technology University Adama Ethiopia Department of Mechanical Engineering School of Mechanical Chemical and Materials Engineering at Adama Science and Technology University Adama Ethiopia

The development of Integrated Enset processing technology is significant for the easy availability of stable food in the current condition for fulfilling the pangs of hunger in Ethiopia, currently; individual manual technologies such as decortication, corm granting, bulla extraction, and fermenting techniques eventually contribute to utilizing food security such as Kocho, which is not affordable for the marginal farmers of Ethiopia. However, there is a lack of integrated compromise of the all-function process of corm granting, decortication, and pulverization in one machine wholesome of the product such as Kocho, and bulla within consuming time and labor. Therefore, it is decided to design and develop an integrated enset processing machine for central high land of Ethiopian farmers with high-quality production. The physical and mechanical properties of the enset is studied to get an efficient and robust design of the various components. The overall design and development of proposed machine components were carried out at Adama science and Technology University, Ethiopia by using ANSYS 2023 R1 software by considering the engineering economics and material specifications as per ASTM standards. The process parameters of the proposed machine are identified as feed rate, drum speed, concave to drum clearance, power requirement, etc. Also, the enset characteristics were considered as decorticating and granting, fiber cutting resistance, fiber length, dimension, shape, and weight. The overall developed enset integrated machine assembles are analyzed for granting and decorticating with drum clearance and bulla extraction throughput capacity, reliability, simplicity, safety, and overall cost. The machine's safety from a Design Perspective is checked and validated by a simulation study on the critical parts subjected to higher stresses. The cost of available individual decorticators, granting, pulverized, and bulla squeezer machines is costly to the farmer’s community. Theref

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Enhancing the Wear Resistance of AlSi9Mg Alloys Using Rotatable Inner-Surface Laser Cladding Method

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Journal of Thermal Spray Technology 2025年 1-16页

作者： Wang, Keyan Yin, Xianqing Lu, Haoran Ai, Yanli State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China

The primary aim of this research is to enhance the wear resistance in commonly used aluminum alloys in the automotive industry, with special emphasis on car engine cylinders. Our approach was based on the development and testing of a unique process called rotatable inner-surface laser cladding (RILC). This process was utilized to generate a stainless steel cladding layer that fortified the inner surface of aluminum cylinders. The results revealed the high-speed laser cladding layer to possess superior qualities such as a thinner cladding layer which is approximately 512 μm and a narrower heat-affected zone. Furthermore, it proved to offer enhanced wear resistance compared to the low-speed laser cladding layer. Microstructure analysis showed that the high cooling rate of high-speed laser cladding significantly refined the grain size in the cladding layer. Additionally, the thickness of the transition layer at the interface was reduced by approximately 50%. Post experimental findings showed the wear depth to be about 1/20 of the substrate, indicating a noteworthy improvement in wear resistance. Consequently, our study enshrines the high-speed laser cladding method as an efficient, economical, and effective process for heightening the wear resistance of aluminum alloys in automotive applications. © ASM International 2025.

关键词： Aluminum alloys

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Impact of Ni doping into Co2SiO4 compound: Synthesis, structural, morphological, dielectric, optical, photoluminescence, and magnetic properties

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Ceramics International 2025年第15期51卷 20839-20853页

作者： Anil Kumar, Bharat Barwar, Abhishek Barbar, Shiv K. Materials Science Laboratory Department of Physics Jai Narain Vyas University Jodhpur342005 India Department of Mechanical Engineering BITS Pilani Rajasthan India

The fabrication and characterization of orthosilicate compounds have received great interest due to their unique optical and magnetic features, and numerous fundamental and technological applications. Herein, a series of Ni doped cobalt orthosilicate compounds, Co2-xNixSiO4 (x = 0.0, 0.1, 0.3 and 0.5) were fabricated via ceramic route by sintering the processed powder at high temperatures. The powder X-ray diffraction results revealed that these compounds crystallize in the orthorhombic symmetry with crystallite size ranging from 29 to 56 nm. Fourier transform infrared and Raman spectra support the phase pure formation of these compounds in the orthorhombic structure. The micro images illustrate a wide range particle size distributions, and elemental analysis affirms the right stoichiometry of these compounds. The dielectric constant and loss angle tangent spectra over the broader frequency range of 101–109 Hz reveal the fundamental polarization and relaxation characteristics of dielectric ceramics. Frequency dependent alternating current electrical conductivity and analysis of UV–Vis reflectance spectra exhibit the wide band gap semiconducting behaviour which establish uses of these compounds in futuristic power electronic module and optoelectronic devices. The fluorescence spectra show a little shift towards the lower wavelength in the emission band by increasing the Ni concentration in the compound. Additionally, the CIE coordinates explain that the blue-violet emission from these compounds, make them useful for cutting edge luminescent devices. Magnetic characterization identified the antiferromagnetic to paramagnetic transition (TN) in these compounds, together with a decrease in TN from 50 K (x = 0.0) to 38 K (x = 0.5). The low temperature (10 K) magnetic hysteresis loops confirm the existence of strong antiferromagnetism with weak ferromagnetism. The presence of two p-type semiconductors (cobalt oxide and nickel oxide) play an important role between magnetic

关键词： Nickel oxide

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Characterization of H2-air detonations with high-speed (2.5 MHz) Rayleigh scattering and single-shot planar laser-induced fluorescence of nitric oxide

Characterization of H2-air detonations with high-speed (2.5 ...

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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Chatelain, Karl P. Alicherif, Mhedine Guiberti, Thibault F. Lacoste, Deanna A. Mechanical Engineering Program Physical Science and Engineering Division PO box 4700 Thuwal23955-6900 Saudi Arabia

ISBN: (纸本)9781624107238

This study characterizes a CJ hydrogen-air detonation using high-speed Rayleigh scattering and single-shot planar laser-induced fluorescence of nitric oxide (NO-PLIF). Firstly, we demonstrate that a Nd:YAG laser cluster can be employed to conduct high-speed Rayleigh scattering visualizations of hydrogen-air detonations at 25 kPa, achieving effective visualization frequencies of 2.5MHz in this study. This multipulse Rayleigh scattering diagnostic is complementary to the existing techniques: (i) it enables the characterization of any detonation, from CJ detonations in large aspect ratio channel to marginal detonations in narrow channels;(ii) it is significantly less expensive than typical burst-mode lasers;(iii) it has adjustable visualization frequency, which can go beyond 10MHz with the same energy per pulse. This makes this diagnostic even more suitable for high-pressure detonations or for undiluted conditions, where structures are smaller and detonations faster, respectively;(iv) it is easily applicable to higher initial pressures since the Rayleigh signal scales with number density. Secondly, we combine this multipulse Rayleigh scattering with NO-PLIF to complement the average speed and speed decay measurements with local induction zone length (δi) measurements. This five-beam configuration provides measurement capabilities similar to our previous three beam configuration, outside of the local speed decay. Furthermore, an experimental and numerical assessment reveals that δi measurements cannot be achieved from Rayleigh scattering, as they are significantly underestimated—by approximately 25%—compared to those from NO-PLIF. Hence, NO-PLIF is recommended over Rayleigh scattering for accurate δi measurements in future studies. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Rayleigh scattering

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Achieving high strength and large ductility in a Cr30Co30Ni30Al5Ti5 alloy through intergranular precipitation

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Journal of materials science and Technology 2025年 215卷 167-179页

作者： Zou, Jiawei Chen, Siyu Cheng, Pengming Ding, Jun Zhang, Chongle Zhang, Shengze Zhang, Bozhao Fu, Xiaoqian Chen, Yujie Zhao, Yuping Qi, Xu Gu, Lin Zhang, Ze Sha, Gang Yu, Qian Center of Electron Microscopy and State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Zhejiang University Hangzhou310027 China School of Materials Science and Engineering Herbert Gleiter Institute of Nanoscience Nanjing University of Science and Technology Nanjing210094 China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an710049 China Center for Alloy Innovation and Design State Key Laboratory for Mechanical Xi'an Jiaotong University Xi'an710049 China Pico Electron Microscopy Center Innovation Institute for Ocean Materials Characterization Technology Center for Advanced Studies in Precision Instruments Hainan University Haikou570228 China Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials School of Materials Science and Engineering Tsinghua University Beijing100084 China

Precipitation at grain boundaries is typically not regarded as an efficient method for strengthening materials since it can induce grain boundary embrittlement, which detrimentally affects ductility. In this research, we developed a multi-principal element alloy (MPEA) with the composition Cr30Co30Ni30Al5Ti5 (at.%), incorporating both intragranular and intergranular nanoprecipitates. Utilizing multiscale, three-dimensional, and in-situ electron microscopy techniques, coupled with computational simulations, we established that intergranular nanoprecipitation in this material plays a crucial role in enhancing strength and promoting dislocation plasticity. The structure of intergranular nanoprecipitation comprises multiple phases with varying composition and structure. Despite the diversity, the crystal planes conducive to the easy glide of dislocations are well-matched, allowing for the sustained continuity of dislocation slipping across different phase structures. Simultaneously, this structure generates an undulated stress field near grain boundaries, amplifying the strengthening effect and facilitating multiple slip and cross-slip during deformation. Consequently, it promotes the proliferation and storage of dislocations. As a result, our material exhibits a yield strength of approximately 1010 MPa and an ultimate tensile strength of around 1500 MPa, accompanied by a significant fracture elongation of 41 %. Our findings illuminate the potential for harnessing intergranular nanoprecipitation to optimize the strength-ductility trade-off in MPEAs, emphasizing the strategy of leveraging complex compositions for the design of sophisticated functional microstructures. © 2024

关键词： Ductility

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Influence of surface layer and screw angle on tribological wear of sliding pedicle screws used in a growth guidance system

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Archives of Civil and mechanical engineering 2025年第3期25卷 1-23页

作者： Szkoda-Poliszuk, Klaudia Dobrowolska-Brończyk, Anna Żak, Malgorzata Pezowicz, Celina Department of Mechanics Materials and Biomedical Engineering Faculty of Mechanical Engineering Wroclaw University of Science and Technology ul. Lukasiewicza 7/9 Wroclaw50-371 Poland Department of Fundamentals of Machine Design and Mechatronic Systems Faculty of Mechanical Engineering Wroclaw University of Science and Technology ul. Lukasiewicza 5 Wroclaw50-371 Poland

The aim of the study was to assess the influence of the type of surface layer (passive vs. diamond-like carbon coated) and the angle of pedicle screw implantation on abrasive wear of sliding screw caps used in spinal growth guidance systems. The scope of the experiment included the performance of high-cycle mechanical tests using reciprocating motion, imitating friction processes that occur during the use of implants. Measurements and identification were also carried out of the type of wear generated by friction (tests of surface topography and changes in chemical composition). Examination of friction surfaces revealed all mechanisms of abrasive wear, i.e., microcutting, scratching, and furrowing. In the case of traditional locking caps, furrowing and scratching were most frequently observed, while for caps coated with diamond-like carbon (DLC), the dominant mechanism was scratching. For most of the friction nodes tested, those with a passive coating showed significantly greater wear than friction nodes with a DLC layer, regardless of the screw implantation angle. On one hand, the use of DLC coatings improves durability owing to increased resistance of the coated surfaces to abrasive wear, but on the other hand, it carries the risk of emergency wear when the DLC coating wears out. © The Author(s) 2025.

关键词： Tribology

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Enhancing Corrosion Resistance and Antibacterial Properties of ZK60 Magnesium Alloy Using Micro-Arc Oxidation Coating Containing Nano-Zinc Oxide

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Acta Metallurgica Sinica(English Letters) 2025年第1期38卷 45-58页

作者： Jin-Xiu Li Jun-Xiu Chen M.A.Siddiqui S.K.Kolawole Yang Yang Ying Shen Jian-Ping Yang Jian-Hua Wang Xu-Ping Su Key Laboratory of Materials Surface Science and Technology of Jiangsu Province Higher Education Institutes Changzhou UniversityChangzhou213164China Department of Orthopedics and Traumatology The Chinese University of Hong KongHong Kong999077China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China Metallurgical Engineering Department NED University of Engineering and TechnologyUniversity RoadKarachiPakistan Mechanical Engineering Department School of Engineering and TechnologyFederal PolytechnicOffa P.M.B 420OffaNigeria Department of Orthopedics Changzhou Hospital of Traditional Chinese MedicineChangzhou213004China

Nano-zinc oxides(ZnO)demonstrate remarkable antibacterial *** further enhance the corrosion resistance and antibacterial efficiency of magnesium alloy micro-arc oxidation(MAO)coatings,this study investigates the preparation of ZnO-containing micro-arc oxidation coatings with dual functionality by incorporating nano-ZnO into MAO *** influence of varying ZnO concentrations on the microstructure,corrosion resistance,and antibacterial properties of the coating was examined through microstructure analysis,immersion tests,electrochemical experiments,and antibacterial *** findings revealed that the addition of nano-ZnO significantly enhanced the corrosion resistance of the MAO-coated ***,when the ZnO concentration in the electrolyte was 5 g/L,the corrosion rate was more than ten times lower compared to the MAO coatings without ***,the antibacterial efficacy of ZnO+MAO coating,prepared with a ZnO concentration of 5 g/L,surpassed 95%after 24 h of co-culturing with Staphylococcus aureus(***).The nano-ZnO+MAO-coated alloy exhibited exceptional degradation resistance,corrosion resistance,and antibacterial effectiveness.

关键词： Nano-ZnO Micro-arc oxidation(MAO)coating ZK60 alloy Corrosion behavior Antibacterial characteristics

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