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Transformation of long-period stacking ordered structures in Mg-Gd-Y-Zn alloys upon synergistic characterization of first-principles calculation and experiment and its effects on mechanical properties

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Journal of Magnesium and Alloys 2024年第5期12卷 1867-1879页

作者： Mingyu Li guangzong Zhang Siqi Yin Changfeng Wang Ying Fu Chenyang Gu renguo guan School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province Dalian Jiaotong UniversityDalian 116028China Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian 116028China Songshan Lake Materials Laboratory Dongguan 523808China

Based on experiments and first-principles calculations,the microstructures and mechanical properties of as-cast and solution treated Mg-10Gd-4Y-xZn-0.6Zr(x=0,1,2,wt.%)alloys are *** transformation process of long-period stacking ordered(LPSO)structure during solidification and heat treatment and its effect on the mechanical properties of experimental alloys are *** reveal that the stacking faults and 18R LPSO phases appear in the as-cast Mg-10Gd-4Y-1Zn-0.6Zr and Mg-10Gd-4Y-2Zn-0.6Zr alloys,*** solution treatment,the stacking faults and 18R LPSO phase transform into 14H LPSO *** Enthalpies of formation and reaction energy of 14H and 18R LPSO are calculated based on *** show that the alloying ability of 18R is stronger than that of *** reaction energies show that the 14H LPSO phase is more stable than the 18R *** elastic properties of the 14H and 18R LPSO phases are also evaluated by first-principles calculations,and the results are in good agreement with the experimental *** precipitation of LPSO phase improves the tensile strength,yield strength and elongation of the *** solution treatment,the Mg-10Gd-4Y-2Zn-0.6Zr alloy has the best mechanical properties,and its ultimate tensile strength and yield strength are 278.7 MPa and 196.4 MPa,*** elongation of Mg-10Gd-4Y-2Zn-0.6Zr reaches 15.1,which is higher than that of Mg-10Gd-4Y0.6Zr *** improving mechanism of elastic modulus by the LPSO phases and the influence on the alloy mechanical properties are also analyzed.

关键词： Mg-Gd-Y-Zn alloys Long-period stacking ordered First-principles calculations Enthalpies Mechanical properties

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累积连续流变挤压对Al-Mg(-Mn-Fe)合金组织性能影响

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精密成形工程 2024年第7期16卷 215-223页

作者：高民强杨博威管仁国大连交通大学连续挤压教育部工程研究中心辽宁大连116028

目的研究多道次累积连续流变挤压变形对Al-Mg(-Mn-Fe)合金组织演化和力学行为的影响,为高性能细晶Al-Mg(-Mn-Fe)合金的制备提供借鉴与参考。方法采用连续流变挤压方法制备Al-Mg(-Mn-Fe)合金,对流变挤压态Al-Mg(-Mn-Fe)合金进行多道次累... 详细信息

目的研究多道次累积连续流变挤压变形对Al-Mg(-Mn-Fe)合金组织演化和力学行为的影响,为高性能细晶Al-Mg(-Mn-Fe)合金的制备提供借鉴与参考。方法采用连续流变挤压方法制备Al-Mg(-Mn-Fe)合金,对流变挤压态Al-Mg(-Mn-Fe)合金进行多道次累积连续流变挤压变形,研究多道次变形前后Al-Mg(-Mn-Fe)合金的微观组织和力学性能变化,讨论变形过程中Al_(6)(Mn,Fe)相对动态再结晶的影响,揭示累积连续流变挤压态Al-Mg(-Mn-Fe)合金的强化机制。结果经3道次累积连续流变挤压变形后,Al-Mg合金和Al-Mg-Mn-Fe合金的平均晶粒尺寸分别减小至21.5μm和2.8μm,细化效果显著;在多道次变形过程中,Al-Mg-Mn-Fe合金内的Al_(6)(Mn,Fe)相逐渐破碎细化并趋于均匀分布,再结晶驱动力增加,阻碍再结晶晶粒长大;经3道次变形后,Al-Mg合金杆材的抗拉强度和伸长率同步提高至267.4 MPa和52.2%,而Al-Mg-Mn-Fe合金杆材的抗拉强度提高至364.2 MPa,伸长率降低至31.7%,该合金的强化机制主要包括细晶强化、位错强化和第二相强化。结论累积连续流变挤压变形可有效细化合金内的晶粒及第二相,提高Al-Mg(-Mn-Fe)合金的综合力学性能。

关键词： Al-Mg(-Mn-Fe)合金累积连续流变挤压变形道次组织性能

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Microstructural evolution and strengthening mechanism of Al–Mg alloys with fine grains processed by accumulative continuous extrusion forming

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Journal of Materials Science & Technology 2022年第33期128卷 195-204页

作者： Bowei Yang Yu Wang Minqiang Gao Changfeng Wang renguo guan School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province Dalian Jiaotong UniversityDalian 116028China Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian 116028China

In this work,the mechanical properties and strengthening mechanisms induced by microstructural evolution in a rheo-extruded 5087 alloy processed via accumulative continuous extrusion forming(ACEF)were *** back-scattered diffraction(EBSD)and transmission electron microscopy(TEM)were utilized to characterize the microstructure of the alloy subjected to ACEF with various *** grain refinement caused by continuous dynamic recrystallization(CDRX)was *** results demonstrated that after 3 passes of ACEF,there was a significant grain refinement effect on the alloy,and the average grain size decreased from 45.6μm to 2.5μm;the ultimate tensile strength(UTS)and yield strength(YS)of the alloy increased to 362.8 MPa and 234.6 MPa,*** cells/walls generated during deformation promoted the formation of low angle grain boundaries(LAGBs).The accumulative strain accelerated the transformation of LAGBs to high angle grain boundaries(HAGBs).Dislocation pile-up enhanced the driving force of CDRX,and nano-sized Al_6(Mn,Fe)phases at the grain boundaries inhibited the growth of grains due to the pinning *** on the quantitative estimation,dislocation strengthening and grain boundary strengthening dominated the enhancement in YS of the ACEFed alloy.

关键词： Al-Mg alloy Grain refinement Mechanical property Dynamic recrystallization Strengthening mechanism

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挤压比对流变挤压成形Al-0.1Fe合金组织性能的影响

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精密成形工程 2024年第8期16卷 52-60页

作者：杨博威刘文月高民强刘鑫郭庆涛巩俐管仁国海洋装备用金属材料及其应用国家重点实验室辽宁鞍山114009 鞍钢集团北京研究院有限公司北京102200 大连交通大学连续挤压教育部工程研究中心辽宁大连116028

目的研究挤压比对流变挤压态Al-0.1Fe合金微观组织演化和力学性能的影响规律,为通过流变挤压成形制备高性能Al材过程中挤压比的选用提供依据与参考。方法采用重力铸造和流变挤压方法制备了Al-0.1Fe合金,对比了铸态和流变挤压态Al-0.1Fe... 详细信息

目的研究挤压比对流变挤压态Al-0.1Fe合金微观组织演化和力学性能的影响规律,为通过流变挤压成形制备高性能Al材过程中挤压比的选用提供依据与参考。方法采用重力铸造和流变挤压方法制备了Al-0.1Fe合金,对比了铸态和流变挤压态Al-0.1Fe合金的微观组织和力学性能,通过Arrhenius方程建立了晶界迁移速率与温度之间的关系,研究了流变挤压过程中不同挤压比对Al-0.1Fe合金组织性能的影响。结果流变挤压变形可消除铸造过程中形成的粗大枝晶,破碎微米尺寸Al_(3)Fe相,使之转变为细小的等轴晶和纳米尺寸Al_(3)Fe相;当挤压比从4增大至6.25时,流变挤压态Al-0.1Fe合金的晶粒逐渐细化,位错密度提高,纳米尺寸Al_(3)Fe相逐渐球化,合金强度和硬度提高,导电率降低;当挤压比为9时,大量摩擦热和变形热增大了晶界迁移速率,导致流变挤压态Al-0.1Fe合金的晶粒和纳米尺寸Al_(3)Fe相发生粗化,位错密度降低,伸长率和导电率提高。结论在流变挤压成形过程中适当提高挤压比可以细化合金的微观组织,提高合金的力学性能;当挤压比过高时,合金微观组织发生粗化,导致合金的力学性能降低。

关键词：挤压比流变挤压 Al-0.1Fe合金组织性能导电率

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Quantitative mechanisms behind the high strength and electrical conductivity of Cu-Te alloy manufactured by continuous extrusion

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Journal of Materials Science & Technology 2022年第26期121卷 9-18页

作者： Qianqian Fu Bing Li Minqiang Gao Ying Fu Rongzhou Yu Changfeng Wang renguo guan Liaoning Key Laboratory of Near-Net Shape Forming of Light Metal Materials Dalian Jiaotong UniversityDalian 116028China Shanxi Datong University Datong 037009China Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian 116028China Songshan Lake Materials Laboratory Dongguan 523808China

The microstructure,mechanical performance,and electrical conductivity of Cu-Te alloy fabricated by continuous extrusion were quantitatively *** results demonstrate that the grain size of the Cu-Te alloy is refined significantly by incomplete dynamic *** Cu2Te phase stimulates recrystallization and inhibits subgrain *** extrusion,the tensile strength increases from217.8±4.8 MPa to 242.5±3.7 MPa,the yield strength increases from 65.1±3.5 MPa to 104.3±3.8 MPa,and the yield to tensile strength ratio is improved from 0.293±0.015 to 0.43±.0.091,while the electrical conductivity of room temperature decreases from 95.8±0.38%International Annealed Cu Standard(IACS)to 94.0%±0.32%*** quantitative analysis shows that the increment caused by dislocation strengthening and boundary strengthening account for 84.6%of the yield strength of the extruded Cu-Te alloy and the electrical resistivity induced by grain boundaries and dislocations accounts for 1.6%of the electrical resistivity of the extruded Cu-Te *** and boundaries contribute greatly to the increase of yield strength,but less to the increase of electrical resistivity.

关键词： Cu-Te alloy Continuous extrusion Microstructure Electrical conductivity Yield strength

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In vivo degradability and biocompatibility of a rheo-formed Mg–Zn–Sr alloy for ureteral implantation

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Journal of Magnesium and Alloys 2022年第6期10卷 1631-1639页

作者： Di Tie renguo guan Huinan Liu Minfang Chen Sviatlana A.Ulasevich Ekaterina V.Skorb Patricia Holt-Torres Xiaopeng Lu Norbert Hort Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian 116028China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Department of Bioengineering University of CaliforniaRiversideCA 92521USA School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China Infochemistry Scientific Center ITMO UniversitySt.Petersburg 192007Russia Magnesium Innovation Center-MAGIC Helmholtz Zentrum GeesthachtGeesthacht D-21502Germany

The introduction of biodegradable implant materials has significantly improved the postoperative subjective feelings of patients within the past few decades,among which magnesium alloy is widely considered a favorable choice as its appropriate biodegradability and evident antibacterial ***,we reveal a semisolid rheo-formed Mg–Zn–Sr alloy ureteral implant that displayed suitable degradability and biocompatibility in a pig *** non-dendritic microstructure was observed in the rheo-formed alloy,which led to ca.47%increase in ultimate tensile strength(from 195.0 MPa to 288.1 MPa)and more homogeneous degradation process compared with the untreated *** post-interventional inflammation or pathological changes of the test animals were observed during the implantation period,and the corrosion rate(0.22±0.04 mm·y^(-1))perfectly fitted the clinical ureteral stent indwelling *** urine bacteria numbers decreased from 88±13 CFU·mL^(-1)at 7 weeks post operation to 59±8 CFU·mL^(-1)at 14 weeks post operation,which confirmed the evident antibacterial activity of the *** study demonstrates that the Mg–Zn–Sr alloy is clinically safe for urinary system,enabling its efficacious use as ureteral implant materials.

关键词： In vivo Biodegradability Biocompatibility Mg–Zn–Sr alloy Ureteral implant

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Understanding the precipitation mechanism of copper-bearing phases in Al-Mg-Si system during thermo-mechanical treatment

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Journal of Materials Science & Technology 2022年第1期96卷 226-232页

作者： Hongmei Jin renguo guan Xianxiang Huang Ying Fu Jin Zhang Xiaolin Chen Yu Wang Fei Gao Di Tie Key Laboratory of Lightweight Structural Materials Liaoning Province School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian 116028China

Al-Mg-Si alloys(6000 series)exhibit a promising prospect as conductive materials due to their high specific strength,high electrical conductivity,excellent formability,good weldability,corrosion resistance and relatively low cost[1-3].These optimum properties are largely attributed to the formation of small-sized,coherent or semi-coherent and metastable phases brought by aging treatment[1,4].

关键词： corrosion treatment coherent

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A high-strength,ductile Al-0.35Sc-0.2Zr alloy with good electrical conductivity strengthened by coherent nanosized-precipitates

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Journal of Materials Science & Technology 2017年第3期33卷 215-223页

作者： renguo guan Yongfeng Shen Zhanyong Zhao Xiang Wang School of Materials Science and Engineering Northeastern University State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology

Ductility and electrical conductivity of metallic materials are inversely correlated with their strength,resulting in a difficulty of optimizing all three simultaneously. We design an Al-Sc-Zr-based alloy using semisolid extrusion to yield a good trade-off between strength and ductility along with excellent electrical conductivity. The Al-0.35Sc-0.2Zr wire with a diameter of 3 mm exhibited the best combined properties： a tensile strength of 210 ± 2 MPa, elongation of 7.6% ± 0.5%, and an electrical conductivity of 34.9 ± 0.05 MS/m. The average particle size of nanosized Al3（Sc, Zr） precipitates increased from 6.5 ± 0.5 nm to 25.0 ± 0.5 nm as the aging time increased from 1 h to 96 h at 380 °C, accompanied by the corresponding volume fraction variation from（6.2 ± 0.1） × 10^（-4） to（3.7 ± 0.1） × 10^（-3）. As proved by transmission electron microscopy observation, the high strength originates from the effective blockage of dislocation motion by numerous nanosized Al3（Sc, Zr） precipitates whilst both electrical conductivity and ductility remain at a high level due to the coherent precipitates possessing an extremely low electrical resistivity.

关键词： Al-0.35Sc-0.2Zr alloy Mechanical properties Electrical conductivity Nanosized precipitates

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Microstructure Formation Mechanism During a Novel Semisolid Rheo-rolling Process of AZ91 Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2013年第4期26卷 447-454页

作者： Zhanyong ZHAO renguo guan Xiang WANG Chunming LIU College of Materials and Metallurgy Northeastern University

A novel semisolid rheo-rolling process of AZ91 alloy was proposed. The microstructure formation mechanism of AZ91 magnesium alloy during the process was studied. The results reveal that the eruptive nucleation and the heterogeneous nucleation exist. During the grain growth process, the grain breakage took place and transformed into fine spherical or rosette grains on the sloping plate gradually, the other grain growth style is direct globular growth. Due to the secondary crystallization of the remnant liquids in the roll gap, the microstructure of the strip becomes finer with the increment of the casting temperature from 650℃ to 690℃. But when the casting temperature reached 710℃, a part of the liquid alloy transformed into the eutectic phases, and the primary grains ripened to form coarse dendrites. In the casting temperature range from 650℃ to 690℃, AZ91 alloy strip with fine spherical or rosette grains was prepared by the proposed process.

关键词： Semisolid Rolling AZ91 alloy Microstructure

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Formation and Evolution of Non-dendritic Microstructures of Semisolid Alloys Prepared by Shearing/Cooling Roll Process

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Journal of Materials Science & Technology 2006年第2期22卷 195-199页

作者： Shuncheng WANG Furong CAO renguo guan Jinglin WEN School of Materials and Metallurgy Northeastern University Shenyang 110004 China

The shearing/cooling roll （SCR） process was adopted to prepare semi-solid A2017 alloy. The formation and evolution of non-dendritic microstructures in semi-solid A2017 alloy were studied. It is shown that the microstructures of semi-solid billets transform from coarse dendrites into fine equiaxed grains as the pouring temperature of molten alloy decreases o.r roll-shoe cavity height is reduced. From the inlet to the exit of roll-shoe cavity, microstructure of semi-solid slurry near the shoe surface is in the order of coarse dendrites, degenerated dendrites or equiaxed grains, but fine equiaxed grains are near the roll surface. Microstructural evolution of semi-solid slurry prepared by SCR process is that the molten alloy nucleates and grows into dendrite firstly on the roll and shoe＇s surface. Under the shearing and stirring given by the rotating roll, the dendrites crush off and disperse into the melt. Under the shearing and stirring on semi-solid slurry with high volume fraction of solid, the dendrite arms fracture and form equiaxed grain microstructures.

关键词： Semi-solid metal processing Non-dendrite Microstructural evolution Shearing and stirring Aluminum alloy

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