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Strengthening effect of prefabrication(10-12)tensile twinning on AZ80+0.4%Ce magnesium alloy and inhibition mechanism of discontinuous precipitation

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Journal of magnesium and alloys 2024年第5期12卷 1918-1930页

作者： Zhen Wang Xi Zhao Zhimin Zhang Yaojin Wu Kai Chen Xianwei Ren Dengkui Wang Wei Wang School of Mechanical and Electrical Engineering North University of ChinaTaiyuan 030051China Engineering Technology Research Center for Integrated Precision Forming of Shanxi Province North University of ChinaTaiyuan 030051China

This paper provided an effective method to further improve the mechanical properties of the AZ80+0.4%Ce magnesium alloy wheel *** effect of high strength and ductility was obtained with a yield strength of 295.36 MPa,an elongation of 10%,by the combination of pre-deformation(7%deformation)and two-stage aging treatment(120℃/9 h+175℃/24 h).The evolution of the microstructure and properties of the alloy was explored under the coupling conditions of different pre-deformation degrees and multi-stage *** results show that,pre-deformation introduced a large number of(1012)tensile twinning and dislocations,which greatly promoted the probability of continuous precipitates(CPs)*** the contrary,the discontinuous precipitates(DPs)were limited by the vertical and horizontal twin *** a result,the pre-nucleation method of two-stage aging increased the proportion of CPs by 34%-38%.Owing to the DPs was effectively suppressed,the alloy's yield strength has been greatly ***,under multi-stage aging,the twin boundaries induce protruding nucleation to form static recrystallization by hindering the migration of dislocations,and the matrix swallows the twins,then the texture gradually tilts from the two poles to the basal *** an important supplement,the grain refinement and oblique texture promoted the improvement of the yield strength of the component.

关键词： magnesium alloy Pre-deformed Two-stage aging Tensile twinning Continuous precipitates Texture

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Investigation of the Micro-Mechanics of an Extruded Precipitation-Strengthened magnesium alloy under Cyclic Loading

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Journal of Materials Science and Chemical Engineering 2024年第7期12卷 40-52页

作者： Chuhao Liu Xiaodan Zhang Huamiao Wang Yinghong Peng State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai China School of Mechanics and Engineering Science Shanghai University Shanghai China

Precipitation strengthening is a crucial microscopic mechanism for enhancing the strength of magnesium alloys. In order to elucidate the influence of precipitation on the microscopic deformation mechanisms and macroscopic mechanical response of magnesium alloys under cyclic loading conditions, we employed a crystal plasticity model to analyze the stress-strain curves, specific crystal plane diffraction intensities, and the temporal evolution of various microscopic deformation mechanisms and twinning volume fractions for an extruded magnesium alloy, AXM10304, containing coherent precipitates. The research findings indicate that precipitation does not fundamentally alter the microscopic mechanisms of this alloy. However, it hinders twinning during the compression stage, mildly promotes detwinning during the tension stage, and enhances tension secondary hardening by elevating the difficulty of activation of the prismatic slip.

关键词： Cyclic Deformation magnesium alloy In-Situ Neutron Diffraction Precipitation Strengthening Crystal Plasticity Lattice Strain Mechanism Evolution

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Study on anisotropy of microstructure and mechanical properties of AZ31 magnesium alloy fabricated by wire arc additive manufacturing

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China Foundry 2023年第4期20卷 280-288页

作者： Dong Ma Chun-jie Xu Jun Tian Shang Sui Can Guo Xiang-quan Wu Zhong-ming Zhang School of Materials Science and Engineering Xi'an University of TechnologyXi'an 710048China Xi'an Shechtman Nobel Prize New Materials Institute Xi'an 710048China Xi'an Key Laboratory of Advanced magnesium alloy Additive Manufacturing and Precision Forming Xi'an 710048China MGM Nobel Prize New Materials Co. Ltd.Tongchuan 727100ShaanxiChina

Based on wire arc additive manufacturing(WAAM)technology,AZ31 magnesium alloy in bulk was successfully fabricated,and its microstructure as well as mechanical properties in different planes were observed and *** AZ31 magnesium alloy has a similar microstructure in the building direction(Z)and travel direction(X),both of which are equiaxed *** are heat-affected zones(HAZs)with coarse grains below the fusion *** second phase is primarily composed of the Mg17Al12 phase,which is evenly distributed in different *** addition,the residual stress varies in different *** is no significant difference in the hardness of the AZ31 alloy along the Z and X directions,with the average hardness being 68.4 HV and 67.9 HV,*** though the specimens’ultimate tensile strength along the travel direction is higher in comparison to that along the building direction,their differences in elongation and yield strength are smaller,indicating that the anisotropy of the mechanical properties of the material is small.

关键词： magnesium alloy wire arc additive manufacturing anisotropy microstructure mechanical properties

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Plastic deformation of magnesium alloy with different forming parameters during ultrasonic vibration-assisted single-point incremental forming

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Rare Metals 2022年第11期41卷 3878-3886页

作者： Chun Jian Su Ting Ting Xu Ke Zhang Ke Zhang Shu Mei Lou Qing Wang College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao266590China

The research of forming parameters on the ultrasonic vibration single-point incremental forming of magnesium alloy plastic deformation can provide a theoretical basis for the establishment of the forming *** to the forming characteristics of magnesium alloy sheet,a new method of ultrasonic vibration-as sis ted single-point incremental forming was *** influence of forming parameters on the plastic deformation of magnesium alloy was studied by finite element simulation and *** influence of vibration frequency,amplitude,friction coefficient,and tool head size on stress and thinning rate of magnesium alloy during ultrasonic vibration-as sis ted single-point asymptotic forming was *** results show that the vibration frequency of 20 kHz and forming tool radius of about 5 mm are beneficial for plastic deformation magnesium alloy in ultrasonic vibration-assisted single-point incremental *** vibration amplitude increasing,the maximum shear stress tends to decrease as a whole,but at the amplitude of 0.16 mm,the thinning rate is large and fracture occurs *** friction coefficient increasing,the maximum shear stress tends to increase,and there is a good linear relationship between the maximum thinning rate and the friction coefficient.

关键词： magnesium alloy Ultrasonic vibration Incremental forming Forming parameters Plastic deformation

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Coupling a titanium dioxide based heterostructure photoanode with electroless-deposited nickel-phosphorus alloy coating on magnesium alloy for enhanced corrosion protection

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Journal of Materials Science & Technology 2022年第31期126卷 252-265页

作者： Yue Liu Feng Peng Guang-Ling Yang Zhi-Hui Xie Wenxin Dai Yuejun Ouyang Liang Wu Chuan-Jian Zhong Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China Medical Research Center Department of OrthopedicsGuangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou 510080China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116China Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol(PVA)Fiber Material Huaihua UniversityHuaihua 418000China College of Materials Science and Engineering/National Engineering Research Center for magnesium alloys Chongqing UniversityChongqing 400044China Department of Chemistry State University of New York at BinghamtonBinghamtonNY13902United States

The utilization of photoelectrochemical cathodic protection(PECCP)enables an indirect corrosion pro-tection of metals with low self-corrosion potential by introducing a metallic nickel ***,the ability to enhance the PECCP efficiency remains challenging because of the inherent property of the ***,this ability is demonstrated by coupling a covalent organic framework(TpBD)dec-orated TiO 2 photoanode(TiO 2/TpBD)with nickel coating on magnesium alloy for an effective corrosion *** composite photoanode showed direct PECCP for the nickel interlayer and indirect corro-sion protection of the magnesium *** composite structure of the nanotube array and the covalent organic framework for the photoanode were confirmed by field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).The en-hanced photoelectrochemical conversion capability and PECCP performance of the nickel-coated Mg alloy were evidenced by the results from electrochemical and photoelectrochemical measurements including Mott-Schottky curves,photoinduced potential variations,and electrochemical impedance spectroscopy(EIS).Lastly,a corrosion protection mechanism is proposed,where the enhanced PECCP efficiency is at-tributed to the formation of a direct Z-scheme heterojunction,which is substantiated by the results from valence band(VB)XPS and electron spin resonance characterizations.

关键词： magnesium alloy Corrosion Nickel coating Electroless Photoelectrochemical cathodic protection

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Aluminum Electroplating on AZ31 magnesium alloy with Acetic Anhydride Pretreatment

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Acta Metallurgica Sinica(English Letters) 2022年第12期35卷 1996-2006页

作者： Zelei Zhang Atsushi Kitada Kazuhiro Fukami Kuniaki Murase Department of Materials Science and Engineering Kyoto UniversityKyoto 606-8501Japan Department of Chemical System Engineering The University of TokyoTokyo 113-8656Japan

magnesium(Mg)alloys for metal electroplating require a surface pretreatment,i.e.,the removal of the spontaneously oxidized surface layer(MgO,Mg(OH)_(2),andMgCO_(3)).However,the use of highly toxic and/or corrosive acids in conventional pretreatment processes has become an *** this study,a facile and less toxic pretreatment is demonstrated and applied in aluminum(Al)*** immersion of the AZ31 Mg alloy into acetic anhydride(Ac_(2)O)removed the spontaneously oxidized surface layer and formed a thin but stable magnesium acetate(Mg(OAc)_(2))layer that protects the metal substrate from further *** Al electroplating bath is a concentrated diglyme(G2)-AlCl_(3)organic solution that can readily dissolve Mg(OAc)_(2)to enable direct plating onto a metal *** as-deposited Al layer has a compact and crack-free morphology that improves the corrosion resistance and hardness(2.7 GPa).Owing to the lack of an interfacial oxidized layer,heat treatment led to the successful diff usion of Mg and Al atoms,which increased the hardness to 4.4 *** Ac_(2)O pretreatment of Mg alloys enables the successful Al electroplating and subsequent heat treatment.

关键词： magnesium alloy Surface modifi cation Electrodeposition Hardness Corrosion resistance

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Mechanism of plasticity enhancement of AZ31B magnesium alloy sheet by accumulative alternating back extrusion

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Journal of magnesium and alloys 2023年第5期11卷 1791-1801页

作者： Ye Wang Feng Li Nan Bian Hua Qiu Du Peng Da Huo School of Materials Science and Engineering Harbin University of Science and TechnologyHarbin 150040PR China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080PR China

Accumulative alternating back extrusion was a potential fine-grain modification *** this paper,it was an innovative attempt to develop high-performance magnesium alloy sheet by this *** the condition of 350 K,commercial AZ31 magnesium alloy was made into billet by accumulative alternating back extrusion,and then extruded into fine-grain magnesium alloy *** a systematic study of its microstructure and mechanical properties,the results showed that the initial state had an important influence on the evolution of the structure during *** accumulative alternating back extrusion to produce the billet,the grain size of the sheet obtained by extrusion was significantly refined,which was related to the accumulation of deformation and grain refinement during the alternating loading *** refinement caused the proportion of dynamic recrystallization inside the sheet with 2 cycles of accumulative alternating back extrusion to drop to 27%.With the increase of extrusion cycles from 2 to 4,the high density of dislocations led to an increase in the proportion of dynamic recrystallization and finer *** texture changed from strong basal texture to weak bimodal *** results of uniaxial tensile test show that due to grain refinement and texture change,the yield strength was significantly reduced,and the plasticity was significantly *** was verified that accumulative alternating back extrusion was meaningful for subsequent processing,and it also provided scientific guidance for the development of fine-grained magnesium alloy sheet.

关键词： magnesium alloy Alternating back extrusion Microstructure uniformity Bimodal texture Texture weakening Sheet anisotropy

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Friction self-piercing riveting(F-SPR)of aluminum alloy to magnesium alloy using a flat die

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Journal of magnesium and alloys 2022年第5期10卷 1207-1219页

作者： Bingxin Yang Yunwu Ma He Shan Sizhe Niu Yongbing Li Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai200240PR China State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240PR China Joining and Welding Research Institute Osaka UniversityOsaka 567-0047Japan

Friction self-piercing riveting(F-SPR)process based on a pip die has been invented to solve the cracking problems in riveting high-strength and low-ductility light metals,such as magnesium alloys,cast aluminum,and 7 series aluminum *** this paper,in order to solve quality issues caused by the misalignment between rivet and pip-die in F-SPR,a flat-die based F-SPR process was proposed and employed to join 1.27 mm-thick AA6061-T6 to 3 mm-thick *** results indicate that a 1.0 mm die distance is effective to avoid rivet upset and insufficient *** the feed rate increases,the heat input in the whole process decreases,resulting in a larger riveting force,which in turn increases both the bottom thickness and interlock ***,solid-state bonding,including Al-Mg intermetallic compounds(IMCs),Al-Mg mechanical mixture,and Al-Fe atom interdiffusion was observed at the joint *** upper Al layer was softened,but the lower Mg layer was hardened,and both sheets exhibited a narrowed affected region with the increase of feed rate,while the rivet hardness shows no obvious *** fracture modes appeared accompanying the variations in lap-shear strength and energy absorption as the feed rate increased from 2 mm/s to 8 mm/***,the F-SPR process using a flat die was compared to those using a pip die and a flat bottom die to show the advantage of flat die on coping with the misalignment problem.

关键词： Friction self-piercing riveting(F-SPR) Flat die Aluminum alloy magnesium alloy Mechanical joining Solid-state bonding

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Design of self-healing PEO-based protective layers containing in-situ grown LDH loaded with inhibitor on the MA8 magnesium alloy

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Journal of magnesium and alloys 2023年第10期11卷 3688-3709页

作者： A.S.Gnedenkov S.L.Sinebryukhov A.D.Nomerovskii V.S.Filonina A.Yu.Ustinov S.V.Gnedenkov Institute of Chemistry of FEB RAS 159 Pr.100-letiya VladivostokaVladivostok690022Russia

The high corrosion rate of magnesium and its alloys in chloride-containing solution significantly reduces the potential of this material for diverse ***,the formation of a smart protective coating was achieved in this work to prevent degradation of the MA8 magnesium alloy.A porous ceramic-like matrix was obtained on the material by plasma electrolytic oxidation(PEO).Further surface functionalization was performed using layered double hydroxides(LDH) served as nanocontainers for the corrosion *** methods of LDH intercalation with benzotriazole(BTA) were *** composition and morphology of the formed coating were studied using SEM-EDX analysis,XRD,XPS,and Raman *** corrosion behavior of the coated samples was evaluated using electrochemical impedance spectroscopy and potentiodynamic *** corrosion rate was estimated using volumetry and gravimetry *** formed composite coating provides the Mg alloy with the lowest corrosion activity(|Z|_(f)=0.1 Hz)=8.48·10^(5) Ω·cm^(2),I_(c)=1.4·10^(-8)A/cm^(2),P_(H)=0.21 mm/year) and improves the protective properties of the PEO-coated sample(|Z|_(f)=0.1 Hz)=8.37·10^(3) Ω·cm^(2),I_(c)=4.1·10^(-7)A/cm^(2),P_(H)=0.31 mm/year).The realization of the self-healing effect of the inhibitor-containing LDH/PEO-coated system was studied using localized electrochemical methods(SVET and SIET) with two artificial defects on the surface.A mechanism involving three stages for the active corrosion protection of the alloy was *** findings contribute to the follow-up work of developing modified LDH/PEO-based structures that promote the Mg alloy with high corrosion resistance,superior electrochemical performance for applications in various fields of industry and medicine.

关键词： magnesium alloy Plasma electrolytic oxidation Layered double hydroxides Corrosion inhibitor Electrochemistry Corrosion rate

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Generating micro/nanostructures on magnesium alloy surface using ultraprecision diamond surface texturing process

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Journal of magnesium and alloys 2023年第4期11卷 1472-1483页

作者： Hanheng Du Mengnan Jiang Zuankai Wang Zhiwei Zhu Suet To State Key Laboratory of Ultra-Precision Machining Technology Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHong KongChina Department of Mechanical Engineering City University of Hong KongHong KongChina School of Mechanical Engineering Nanjing University of Science and TechnologyNanjingChina

The lightness and high strength-to-weight ratio of the magnesium alloy have attracted more interest in various ***,micro/nanostructure generation on their surfaces remains a challenge due to the flammability and *** by this,this study proposed a machining process,named the ultraprecision diamond surface texturing process,to machine the micro/nanostructures on magnesium alloy *** results showed the various microstructures and sawtooth-shaped nanostructures were successfully generated on the AZ31B magnesium alloy surfaces,demonstrating the effectiveness of this proposed machining ***,sawtooth-shaped nanostructures had the function of inducing the optical effect and generating different colors on workpiece *** colorful letter and colorful flower image were clearly viewed on magnesium alloy *** corresponding cutting force,chip morphology,and tool wear were systematically investigated to understand the machining mechanism of micro/nanostructures on magnesium alloy *** proposed machining process can further improve the performances of the magnesium alloy and extend its functions to other fields,such as optics.

关键词： magnesium alloy Micro/nanostructure Ultraprecision diamond surface texturing Cutting force Chip morphology Structural color

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