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Journal of Magnesium and Alloys 2021年第5期9卷 1761-1772页

作者： Haipeng Zheng ruizhi wu Legan Hou Jinghuai Zhang Milin Zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationHarbin Engineering UniversityNo.145 Nantong Street Nangang DistrictHarbin 150001China College of Science Heihe UniversityHeihe 164300PR China

Based on the traditional two-layer accumulative roll bonding(TARB),the geometrical variations and mathematical relationship during the four-layer accumulative roll bonding(FARB)were derived and ***,the multi-layer accumulative roll bonding(MARB)technology was proposed and the geometrical variations and mathematical relationship of MARB were simultaneously derived and ***,Mg-14Li-3Al-2Gd(LAGd1432)sheets were fabricated by TARB and FARB,*** with the TARB,the FARB has a higher accumulative efficiency in terms of accumulative layers,total number of interfaces,interface spacing,total deformation and equivalent ***,the FARB-processed sheets in lower cycles have the similar microstructure and mechanical properties of the TARB-processed sheets in higher *** addition,FARB process can further break through the deformation limit of TARB process in a single cycle through adopting two-step rolling in one cycle with 50%deformation in one pass and 75%accumulative deformation in one cycle,which can effectively solve the problem of poor interface bonding of the latest interface brought by the last cycle,and thus significantly improve the phenomenon of unstable performance of the ARB-processed sheets.

关键词： ARB Mathematical relationship Equivalent strain Strengthening mechanism

Towards designing high mechanical performance low-alloyed wrought magnesium alloys via grain boundary segregation strategy:A review

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Journal of Magnesium and Alloys 2024年第5期12卷 1774-1791页

作者： Zhi Zhang Jinshu Xie Jinghuai Zhang Xu-Sheng Yang ruizhi wu Key Laboratory of Superlight Material and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Ultra-Precision Machining Technology Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518060China

Low-alloyed magnesium(Mg)alloys have emerged as one of the most promising candidates for lightweight ***,their further application potential has been hampered by limitations such as low strength,poor plasticity at room temperature,and unsatisfactory *** address these challenges,grain refinement and grain structure control have been identified as crucial factors to achieving high performance in low-alloyed Mg *** effective way for regulating grain structure is through grain boundary(GB)*** review presents a comprehensive summary of the distribution criteria of segregated atoms and the effects of solute segregation on grain size and growth in Mg *** analysis encompasses both single element segregation and multi-element co-segregation behavior,considering coherent interfaces and incoherent ***,we introduce the high mechanical performance low-alloyed wrought Mg alloys that utilize GB segregation and analyze the potential impact mechanisms through which GB segregation influences materials *** upon these studies,we propose strategies for the design of high mechanical performance Mg alloys with desirable properties,including high strength,excellent ductility,and good formability,achieved through the implementation of GB *** findings of this review contribute to advancing the understanding of grain boundary engineering in Mg alloys and provide valuable insights for future alloy design and optimization.

关键词： Magnesium alloys Grain boundary segregation High strength High plasticity High formability

Effect of Y and Ce on the microstructure, mechanical properties and anisotropy of as-rolled Mg-8Li-1Al alloy

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Journal of Materials Science & Technology 2020年第4期39卷 124-134页

作者： Feng Zhong Huajie wu Yunlei Jiao ruizhi wu Jinghuai Zhang Legan Hou Milin Zhang Key Laboratory of Superlight Material and Surface Technology(Harbin Engineering University) Ministry of EducationHarbin 150001China College of Science Heihe UniversityHeihe UniversityHeihe 164300China Tianjin Institute of Aerospace Mechanical and Electrical Equipment Tianjin 300301China

The effects of combined addition of Y and Ce on the microstructure,mechanical properties and anisotropy of as-rolled Mg-8 Li-1 Al(LA81)alloy were *** combined addition of Y and Ce improves the mechanical properties with a low plasticity loss by solution strengthening,dispersion strengthening,grain refinement ***-8 Li-1 Al-0.6 Y-0.6 Ce(LA81-0.6 Y-0.6 Ce)has better mechanical properties and shows an almost *** possesses an ultimate tensile strength of 278.7 MPa and an elongation of 15.0%.Compared to LA81 alloy,the ultimate tensile strength increases by about 17.6%with an elongation reduction of only 3.5%,and a good isotropy of ultimate tensile strength and elongation(the value of ravg is near 1).

关键词： Mg-Li alloy Cross rolling Alloying Mechanical properties Anisotropy

Modifying microstructures and tensile properties of Mg-Sm based alloy via extrusion ratio

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Journal of Magnesium and Alloys 2021年第3期9卷 1098-1109页

作者： Kai Guan Rui Ma Jinghuai Zhang ruizhi wu Qiang Yang Jian Meng Key Laboratory of Superlight Material and Surface Technology Ministry of EducationCollege of Material Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001PR China Department of Materials Engineering The University of TokyoTokyo 113-8656Japan State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022PR China

Microstructure and tensile properties of a Mg-Sm-Zn-Zr alloy with various extrusion ratios(ERs)of 6.9,10.4 and 17.6 were systematically *** was identified that,greater ER increased dynamic recrystallization(DRX)fraction and coarsened DRX grains,which further suggests weakened basal fiber texture for the studied *** is mainly due to the rising temperature from massive deformation heat when *** a result,greater ER corresponds to a decreased strength but improved ***,transmission electron microscopy(TEM)observations reveal that the dominant intermetallic phase,Mg_(3)Sm,is metastable,and it will transform into Mg_(41)Sm_(5)during extrusion with *** transformation leads to the accumulation of surplus Sm and Zn atoms,which induces the precipitation of Sm Zn_(3)phase at the surface of Mg_(41)Sm_(5)matrix.

关键词： Magnesium alloys Extrusion ratio Microstructure Phase transition Transmission electron microscopy Tensile properties

Effects of icosahedral phase on mechanical anisotropy of as-extruded Mg-14Li (in wt%) based alloys

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Journal of Materials Science & Technology 2019年第11期35卷 2477-2484页

作者： Chuanqiang Li Daokui Xu Baojie Wang Liyuan Sheng ruizhi wu Enhou Han Peking University Shenzhen InstituteShenzhen Key Lab Human Tissue Regenerate&RepairShenzhen 518057China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang 110159China Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China

Through investigating and comparing microstructure and crystallographic texture of as-extruded Mg-14Li and Mg-14Li-6Zn-1Y(in wt%)alloys,the differences in their mechanical anisotropy were *** revealed that the formation of I-phase(Mg3Zn6Y,icosahedral structure)can effectively refine grain ***,compared with Mg-14Li alloy,the texture type of Mg-14Li-6Zn-1Y alloy changed slightly,but its texture intensity decreased *** a result,the stronger texture contributed to the"normal"mechanical anisotropy of Mg-14Li alloy with higher tensile strength and a lower elongation ratio along transverse direction(TD)than those along extrusion direction(ED).However,for Mg-14Li-6Zn-1Y alloy,the zonal distribution of I-phase particles along ED caused"abnormal"mechanical anisotropy,*** tensile strength and better plasticity along ED.

关键词： Mg-Li alloys Texture I-phase Mechanical anisotropy Fracture

Influence of power dissipation value and deformation activation energy on recrystallization in compression deformation behavior of Mg-Li-Zn-Y alloy

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Journal of Rare Earths 2024年第12期42卷 2341-2349,I0006页

作者： Di An Bingyu Qian ruizhi wu Xiang Wang Legan Hou Xiaochun Ma Jinghuai Zhang Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationCollege of Materials Science&Chemical EngineeringHarbin Engineering UniversityHarbin150001China College of Materials Science and Engineering Heilongjiang University of Science and TechnologyHarbin150022China

The thermal compression deformation behavior of Mg-6Li-11Zn-2.5Y alloy was systematically investigated by using the isothermal hot compression tests using the Gleeble-3500 thermal mechanical physical simulation system with the conditions of the temperature of 513-593 K and the strain rate of *** constitutive model and thermal processing map were *** variation pattern of the unstable region under different strains was analyzed and the safe processing region was *** influence of different power dissipation values and deformation activation energies on the dynamic recrystallization mechanism was *** results demonstrate that the deformation activation energy is 156.08 k J/*** unstable region gradually expands from the low temperature and low strain region to the high temperature and high strain region with the strain *** the unstable region,adiabatic shear band pear in a-Mg phase,of which the main reason is the poor processing formability in the unstable *** dominant nucleation mechanism is discontinuous dynamic recrystallization under the conditions of high power dissipation and low deformation activation ***,under the conditions of low power dissipation and high deformation activation energy,the nucleation mechanism is mainly driven by the particle stimulated nucleation.

关键词： Mg-Li Constitutive model Processing map Dynamic recrystallization Rare earths

Coarsening kinetics and strengthening mechanisms of core-shell nanoscale precipitates in Al-Li-Yb-Er-Sc-Zr alloy

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Journal of Materials Science & Technology 2021年第2期61卷 197-203页

作者： Yang Wang Shun Zhang ruizhi wu Nodir Turakhodjaev Legan Hou Jinghuai Zhang Sergey Betsofen Key Laboratory of Superlight Materials&1 Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China College of Science Heihe UniversityHeihe 164300China Department of Machine Building Tashkent State Technical UniversityTashkent 100056Uzbekistan Moscow Aviation Institute National Research UniversityMoscow 109383Russia

The tailored nanoparticles with a complex core/shell structure can satisfy a variety of demands, such as lattice misfit, shearability and coarsening resistance. In this research, core-shell nanoscale Al3(Yb, Er, Sc,Zr, Li) composite particles were precipitated in Al-2 Li-0.1 Yb-0.1 Er-0.1 Sc-0.1 Zr(wt%) alloy through the double-aging treatment, in which the core was(Yb, Er, Sc, Zr)-rich formed at 300°C and the shell was Li-rich formed at 150°C. The coarsening kinetics and precipitate size distributions(PSDs) of Al3(Yb, Er, Sc,Zr, Li) particles aged at 150°C previously aged at 300°C for 24 h showed a better fit to the relation of 2∝ kt and normal distribution, indicating that the coarsening of precipitates was controlled by interface reaction, not diffusion. The Orowan bypass strengthening was operative mechanism at 150°C.

关键词： Al-Li alloys Aging Core-shell structure Coarsening kinetics Strengthening mechanisms

Effect of Initial Microstructure Prior to Extrusion on the Microstructure and Mechanical Properties of Extruded AZ80 Alloy with a Low Temperature and a Low Ratio

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Chinese Journal of Mechanical Engineering 2023年第3期36卷 339-349页

作者： Hang Zhang Haipeng Li Rongguang Li Boshu Liu ruizhi wu Dongyue Zhao Shanshan Li School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142China Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China

Magnesium(Mg)alloys are the lightest metal structural material for engineering applications and therefore have a wide market of ***,compared to steel and aluminum alloys,Mg alloys have lower mechanical properties,which greatly limits their *** is one of the most important processing methods for Mg and its ***,the effect of such a heterogeneous microstructure achieved at low temperatures on the mechanical properties is lacking *** this work,commercial AZ80 alloys with different initial microstructures(as-cast and as-homogenized)were selected and extruded at a low extrusion temperature of 220℃and a low extrusion ratio of *** microstructure and mechanical properties of the two extruded AZ80 alloys were *** results show that homogenized-extruded(HE)sample exhibits higher strength than the cast-extruded(CE)sample,which is mainly attributed to the high number density of fine dynamic precipitates and the high fraction of recrystallized ultrafine *** to the coarse compounds existing in CE sample,the fine dynamical precipitates of Mg17(Al,Zn)12form in the HE sample can effectively promote the dynamical recrystallization during extrusion,while they exhibit a similar effect on the size and orientation of the recrystallized *** results can facilitate the designing of high-strength wrought magnesium alloys by rational microstructure construction.

关键词： Magnesium alloy Low temperature and low ratio extrusion Bimodal grain structure Dynamic precipitate Dynamic recrystallization

Enhanced Electromagnetic Interference Shielding in a Duplex-Phase Mg-9Li-3Al-1Zn Alloy Processed by Accumulative Roll Bonding

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Acta Metallurgica Sinica(English Letters) 2020年第4期33卷 490-499页

作者： Jiahao Wang Lin Xu ruizhi wu Jing Feng Jinghuai Zhang Legan Hou Milin Zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China College of Science Heihe UniversityHeihe 164300China

High electromagnetic shielding performance was achieved in the Mg-9Li-3Al-1Zn alloy processed by accumulative roll bonding(ARB).The microstructure,electromagnetic interference shielding effectiveness(SE) in the frequency of 30-1500 MHz and mechanical properties of the alloy were investigated.A model based on the shielding of the electromagnetic plane wave was used to theoretically discuss the EMI shielding mechanisms of ARB-processed *** indicate that the SE of the material increases gradually with the increase in the ARB *** enhanced SE can be attributed to the obvious microstructure orientation caused by ARB,and the alternative arrangement of alpha(Mg) phase and beta(Li)*** addition,with the increase in ARB pass,the number of interfaces between layers increases and the grain orientation of each layer tends to alignment along c-axis,which is beneficial to the reflection loss and multiple reflection loss of the incident electromagnetic wave.

关键词： Accumulative roll bonding(ARB) Mg-Li alloy Dual-phase alloys Electromagnetic interference Reflection loss

Synergistic improvement of damping capacity and mechanical properties of magnesium alloy prepared with UHP technology

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Journal of Rare Earths 2024年第12期42卷 2279-2284,I0003页

作者： Dan Wang Peizhao Huang ruizhi wu Hailiang Huang Tao Zhong Cunwei Zou Yaqiang Song Key Laboratory of New Carbon-based Functional and Super-hard Materials of Heilongjiang Province School of Physics and Electronic EngineeringMudanjiang Normal UniversityMudanjiang157011China Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin150001China Nanning College for Vocational Technology Nanning530008China

The contradictory relationship between the damping capacity and strength of metals,governed by dislocation mechanisms,poses a challenge in improving simultaneously through dislocation ***,exploring novel methods to synergistically enhance mechanical properties and damping capacity is designated as a focal research subject in recent *** study at hand aims to tackle this challenge through the manipulation of microstructures in Mg-Y-Er-Zn-Zr alloy via ultra-high pressure(UHP)heat treatment,yielding Mg-based alloys of exceptionally lightweight with outstanding damping and mechanical *** UHP,a significant refinement in the alloy's grain size is observed,with the average grain size decreasing from 114 to 23μm,accompanied by substantial introduction of dislocations into the matrix,along with the emergence of twin within the *** tensile strength of M-6GPa-1000 alloy subjected to UHP treatment achieves 326 MPa,demonstrating a 95%increase compared to ordinary heat treatment alloys while maintaining an elongation of 11.9%.Additionally,the damping capacity value Q-1 of M-6GPa-1000 alloy treated with UHP during the low-strain zone is 0.03,exhibiting a threefold increase compared to that of the conventionally heat-treated *** UHP treatment,the alloy's microstructure is regulated,achieving a synergistic enhancement of strength and damping *** study comprehensively analyzes the synergistic improvement of mechanical and damping characteristics in the *** proposed UHP technology holds significant potential for the fabrication of advanced Mg-Re components.

关键词： Mg-RE alloy Ultra-high pressure treatment Mechanical properties Damping capacity Rare earths