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Mechanistic investigation on Ce addition in tuning recrystallization behavior and mechanical property of Mg alloy

Journal of Materials Science & Technology 2023年第1期132卷 1-17页

作者： J.R.Li D.S.Xie Z.R.Zeng B.Song H.B.Xie R.S.Pei H.C.Pan Y.P.Ren G.W.Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) College of Materials Science and EngineeringNortheastern UniversityShenyang110819China College of Engineering and Computer Science Australian National UniversityACT 2601Australia School of Materials and Energy Southwest UniversityChongqing 400715China Institute for Physical Metallurgy and Materials Physics RWTH Aachen UniversityAachen 52062Germany

Constructing bimodal grain structure is a promising approach to achieve the high strength-ductility syn-ergy in Mg *** of bimodal grain is closely related to the dynamic and/or static recrystal-lization process,which has not been fully understood in the typical Mg-RE based *** this work,it is claimed for the first time that the minor Ce addition(∼0.3 wt%)into Mg matrix significantly pro-motes the pyramidaland non-basaldislocations at the early stage of extrusion,which con-sequently enhances the formation of sub-grain boundaries via the movement and recovery of pyramidal II-type*** this stage,fine sub-grain lamellae are widely observed predominantly due to the low migration rate of sub-grain boundary caused by the limited mobility of*** the later stage,the sub-grains continuously transform into dynamic recrystallized(DRXed)grains that have10¯10Taylor axis and also strong fiber texture,indicating substantial activation of pyramidal II-type*** low mobility ofdislocations,accompanied with the solute drag from grain boundary(GB)segregation and pinning from nano-phases,cause a sluggish DRX process and thus a bimodal microstructure with ultra-fined DRXed grains,∼0.51μ*** resultant texture hardening and grain refinement hardening effects,originated from bimodal microstructure,result in a yield strength of∼352 MPa,which is exceptional in Mg-Ce dilute *** work clarifies the critical role of Ce addition in tuning recrystallization behavior and mechanical property of magnesium,and can also shed light on designing the other high-performance Mg alloys.

关键词： Mg alloys recrystallization behavior Mechanical property Pyramidal dislocation Thermal stability

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Microstructure Evolution and recrystallization behavior of Friction Stir Welded Thick Al-Mg-Zn-Cu alloys:Influence of Pin Centerline Deviation

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Acta Metallurgica Sinica(English Letters) 2022年第5期35卷 745-756页

作者： Yu-Qing Mao Ping Yang Li-Ming Ke Yang Xu Yu-Hua Chen National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology Nanchang Hangkong UniversityNanchang330063China

Four tools with different pin centerline deviations were fabricated to friction stir weld(FSW)thick plates of Al-Mg-Zn-Cu *** results show that,compared with the pin without pin centerline deviation,the applying of pin centerline deviation is favorable to improve the flowability of plastic material,enlarging the size of nugget zone,refining the grains and reprecipitated phase particles,enhancing the degrees of dynamic recrystallization and quantity of high angle grain boundaries owing to higher temperature and bigger eccentric force,resulting in the increase of strain *** for the used pin with a centerline deviation of 0.2 mm,the highest average hardness and best metallurgical properties of thick FSW joints are produced,and which are consistent with the microstructure evolution and recrystallization ***,the fracture mode of the joints produced by the pins with centerline deviation from 0 mm to 0.3 mm changes gradually from a brittle fracture in the nugget zone(NZ)to a ductile failure in the HAZ.

关键词： Thick Al-Mg-Zn-Cu alloys Friction stir welding Pin centerline deviation Microstructure evolution recrystallization behavior

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Texture evolution and recrystallization behaviors of Cu-Ag alloys subjected to cryogenic rolling

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Transactions of Nonferrous Metals Society of China 2015年第9期25卷 2948-2957页

作者：鲁月马茹王轶农大连理工大学材料科学与工程学院大连116024

The texture evolution and mechanical properties of Cu-Ag alloys subjected to severe plastic deformation at cryogenic temperature（CT） were investigated and the sequent annealing behaviors were also *** with the sheets rolled at room temperature（RT） showing copper texture,the CT-rolled sheets exhibited brass texture which indicated that cross-slip was suppressed at CT,and both the ultimate tensile strength and yield strength of the sheets were *** to the in-situ recrystallization mechanism,recrystallization textures in as-annealed CT-rolled sheets were randomly distributed,while the as-annealed RT-rolled sheets mainly contained cube *** of the rolled and annealed sheets were observed using optical microscopy and electronic back-scatter *** results show that the dynamic recovery was suppressed during CT-rolling and resulted in higher deformation energy ***,the recrystallization of CT-rolled sheets could start at a lower temperature than that of RT-rolled sheet at the same reduction.

关键词： cryogenic rolling copper alloy texture evolution recrystallization behavior

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High strength and high ductility Mg-Gd-Y-Zn-Zr alloys obtained by controlling texture and dynamic precipitation through LPSO phase structure of different initial morphologies

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Journal of Rare Earths 2024年第12期42卷 2217-2230,I0002页

作者： Yayun He Rui Guo Xi Zhao Zhimin Zhang College of Mechanical and Electrical Engineering North University of ChinaTaiyuan030051China School of Aeronautics and Astronautics North University of ChinaTaiyuan030051China College of Materials Science and Engineering North University of ChinaTaiyuan030051China

This paper investigated the effects of three different initial phase structures on the microstructure evolution and tensile properties of extruded Mg-Gd-Y-Zn-Zr alloy,using an extrusion ratio of *** three initial phase structures were obtained by heat treatment,which is narrow spacing long-period stacking ordered phase(LPSO)phase structure alloy(EN alloy),wide spacing LPSO phase structure alloy(EW alloy),and narrow spacing LPSO phase andβphase overlapping phase structure alloy(EO alloy).The dynamic recrystallization(DRX)and dynamic precipitation behavior of extruded alloys with different initial structures,as well as their strengthening and ductility mechanisms were studied in *** hot extrusion with a low extrusion ratio,the alloy exhibits a bimodal structure composed of undynamic recrystallization(UN-DRX)grains and dynamic recrystallization(DRX)grains with strong *** narrow-spacing LPSO phase structure inhibits DRX and dynamic precipitation,while both the wide-spacing LPSO phase structure and the overlapping phase structure alloys promote DRX and dynamic *** strength improvement is mainly due to the strong texture and internal dislocation pinning of the undynamic recrystallization zone(UN-DRX)and the high strengthening effect of the narrow spacing LPSO *** the promotion of DRX improves grain boundary strengthening effect,it cannot make up for reducing the UN-DRXed grain strengthening effect.A lower volume fraction ofβdynamic precipitation phase is beneficial for improving the ductility of the alloy.

关键词： Mg-Gd-Y-Zn-Zr alloy recrystallization behavior Mechanical property Rare earths

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Evolution of Goss texture in thin-walled copper tube at different heat treatment temperatures

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Transactions of Nonferrous Metals Society of China 2022年第4期32卷 1205-1216页

作者： Song-wei WANG Hong-wu SONG Yan CHEN Qi YU Shi-hong ZHANG Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Jiangxi Copper Corporation Co. Ltd.Nanchang 330096China

The evolution of microstructure,textures,and mechanical properties of thin-walled copper tube during heat treatment was investigated using EBSD technique and tensile *** results show that the initial deformation textures of pre-drawn thin-walled copper tube are mainly composed of Copper and Y components,while with the increase of temperatures,the textures are transformed into a strong Goss texture *** high-resolution microstructural characterizations indicate that the new Goss recrystallized grains nucleate and grow up within the deformed Copper grains and Y grains in different mechanisms,*** tensile strength of the thin-walled copper tube decreases gradually with the increase of the temperature,while the elongation increases first and then decreases sharply due to the action of grain sizes and texture components.

关键词： thin-walled copper tube recrystallization behavior Goss texture nucleation mechanism annealing twin

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