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通过添加微量Mn元素激活非基面滑移提高镁合金塑性

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Transactions of Nonferrous Metals Society of China 2024年第2期34卷 504-518页

作者：周世博刘婷婷汤爱涛时慧敬学锐彭鹏章建跃潘复生重庆大学材料科学与工程学院重庆400044 Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck-Straße 1D-21502GeesthachtGermany 西南大学材料与能源学院重庆400715 重庆大学镁合金国家工程研究中心重庆400044 重庆科技学院冶金和材料工程学院重庆401331 Department of Materials Science and Engineering The Ohio State UniversityColumbusOH 43210USA

分析微量锰添加对镁合金显微组织和力学性能的影响。采用电子背散射技术、迹线分析、透射电镜和粘塑性自洽模拟等方法研究变形过程中的塑性变形机理。结果表明:Mn的加入使Mg−Mn合金的平均晶粒尺寸由28.30μm减小到5.10μm;同时,随着Mn... 详细信息

分析微量锰添加对镁合金显微组织和力学性能的影响。采用电子背散射技术、迹线分析、透射电镜和粘塑性自洽模拟等方法研究变形过程中的塑性变形机理。结果表明:Mn的加入使Mg−Mn合金的平均晶粒尺寸由28.30μm减小到5.10μm;同时,随着Mn含量的增加,样品的断裂伸长率由14.33%提高到20.33%,屈服强度则由84 MPa提高到180 MPa。这种同时提高塑性和强度的原因是基面滑移和非基面滑移之间的临界剪切应力差从173 MPa减小到115 MPa,导致非基面滑移活动明显增加。通过微合金元素调整滑移系统差异为开发具有高强度和延展性的镁合金提供了一种途径。

关键词：镁合金显微组织演变力学性能塑性变形机理

Effects of Sr on the microstructure,tensile and creep properties of AZ61-0.7Si magnesium alloy

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International Journal of Minerals,Metallurgy and Materials 2009年第1期16卷 89-95页

作者： Ming-bo Yang Jia Shen Liang Bai fu-sheng pan Materials Science and Engineering College Chongqing Institute of Technology Chongqing 400050 China Materials Science and Engineering College Chongqing University Chongqing 400030 China

The modification and refinement of Mg2Si phase is thought to be one of the key aspects to improve the mechanical properties of Si-containing magnesium alloys. In this article, the effects of Sr on the microstructure, tensile and creep properties of AZ61-0.7Si magnesium alloy were investigated. The results indicate that adding small amounts of Sr to AZ61-0.7Si alloy can modify and refine Chinese script shaped Mg2Si phases in the alloy. After adding 0.03wt%-0.09wt% Sr to AZ61-0.7Si alloy, the Mg2Si phases in the alloy change from the coarse Chinese script shape to fine granule and/or irregular polygonal shapes. The modification and refinement mechanisms of Mg2Si phases in Sr-containing AZ61-0.7Si alloys are possibly related to the reduction of growth rate and the enhancement of nucleation ratio for Mg2Si particles during the solidification process. Owing to the modification and refinement of Mg2Si phases, the tensile and creep properties of Sr-containing AZ61-0.7Si alloys are greatly improved.

关键词： magnesium alloy Mg2Si phase Sr addition mechanical properties microstructure

Microstructure and corrosion properties of Mg-0.5Zn-0.2Ca-0.2Ce alloy with different processing conditions

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Rare Metals 2021年第7期40卷 1924-1931页

作者： Cheng Zhang Liang Wu Guang-sheng Huang Guan-Gang Wang Bin Jiang fu-sheng pan State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing UniversityChongqing 400044China

The microstructure and corrosion resistance of Mg-0.5 Zn-0.2 Ca-0.2 Ce alloy with different processing conditions were *** composition was detected by X-ray fluorescence(XRF),and the microstructure was analyzed by optical microscopy(OM)and scanning electron microscope(SEM)equipped with energy-dispersive spectroscopy(EDS).The corrosion behavior was investigated by hydrogen evolution tests,weight loss tests and electrochemical *** Mg-0.5 Zn-0.2 Ca-0.2 Ce alloy has much better corrosion resistance compared with the commercial AZ31 sheet,which can be attributed to its dispersive second phases and protective corrosion products film on the alloy ***,the as-rolled Mg-0.5 Zn-0.2 Ca-0.2 Ce alloy shows much better corrosion resistance compared with the as-extruded Mg-0.5 Zn-0.2 Ca-0.2 Ce *** can be due to three aspects:The as-rolled alloy has smaller grain size;the as-rolled alloy has lower(1010)/(1120)texture intensity;the residual stress of the as-rolled alloy is eliminated during the annealing process,but large residual stress exists in the asextruded alloy produced by the extrusion process.

关键词： Mg-0.5Zn-0.2Ca-0.2Ce alloy Processing conditions Texture Corrosion behavior

Enhanced Electromagnetic Interference Shielding of Mg–Zn–Zr Alloy by Ce Addition

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Acta Metallurgica Sinica(English Letters) 2015年第4期28卷 492-498页

作者： Xian-Hua Chen Li-Zi Liu Juan Liu fu-sheng pan College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Academy of Science and Technology

The effects of Ce addition on microstructure and electromagnetic interference （EMI） shielding response of Mg- 6Zn-0.5Zr （ZK60） alloy have been investigated. Ce addition resulted in grain refinement and higher density of Mg-Zn-Ce and MgZn2 intermetallic particles in the alloy. In particular, this was substantially remarkable as the addition of Ce was up to 1.0 wt%. It is interesting to note that as-extruded ZK60 alloy with 1.0 wt% Ce addition exhibited an EMI shielding effectiveness （SE） exceeding 70 dB at the frequency range of 30-1,500 MHz, which was significantly higher than that of ZK60 alloy without Ce addition and reached the requirement of high protection. The superior SE was probably related to the increased reflection and multiple reflection of electromagnetic radiation induced by Ce addition. Direct artificial aging at 150 ℃ for 25 or 50 h led to a further increase of 7-10 dB in the SE of the alloy with 1.0 wt% Ce addition. The advantages of excellent shielding capacity and favorable mechanical strength make the Mg-Zn-Zr-Ce alloy an attractive shielding candidate material for a variety of technological applications.

关键词： Magnesium alloys Ce Shielding effectiveness Electromagnetic interference Intermetallicparticles

Influence of Grain Orientation on the Corrosion Behavior of Rolled AZ31 Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2015年第11期28卷 1387-1393页

作者： Yan-Chun Zhao Guang-sheng Huang Guan-Gang Wang Ting-Zhuang Han fu-sheng pan State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Research Center for Advanced Materials Chongqing Academy of Science and Technology

The effect of the grain orientation on corrosion behavior of rolled AZ31 magnesium alloy is investigated in this study. The test samples have a similar surface roughness to the Mg alloy in practical application. The immersion test and electrochemical impedance spectroscopy show that the TD-ND planes dominated by （101-0）, （1120） and （1011） oriented grains show a higher corrosion resistance compared with these of the RD-TD planes which consist mainly of （0001） oriented grains. Here, RD, ND and TD represent the rolling direction, the normal direction and the transverse direction of the alloy sheet, respectively. The surface morphologies of the alloys at various immersion stages are observed by scanning electron microscopy, and the surface topography of the alloy substitutes is also observed by laser scanning confocal microscopy. The TD-ND planes show a regular corrosion along the TD direction, but the RD-TD plane shows an irregular corrosion.

关键词： Magnesium alloys Corrosion behavior Electrochemical impedance spectroscopy Crystallographic orientation

Effects of Ca Addition on the Mechanical Properties and Corrosion Behavior of ZM21 Wrought Alloys

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Acta Metallurgica Sinica(English Letters) 2017年第1期30卷 53-65页

作者： Jiang Yang Jian Peng Min Li Eric A.Nyberg fu-sheng pan State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Chongqing Academy of Science and Technology Chongqing 401123China Pacific Northwest National Laboratory RichlandWA 99354USA

The microstructures, mechanical properties, and corrosion resistance of ZM21 magnesium alloys with a wide range of calcium （Ca） addition （0.1-1.6 wt%） were investigated. Results showed that the mechanical properties and corrosion resistance were improved with Ca addition because of grain refinement and formation of Ca2Mg6Zn3. However, these properties were deteriorated when Ca contents reached 1.6 wt%. The optimal Ca content of alloys was 0.7 wt%; alloy with this Ca content showed good mechanical performance and corrosion resistance, having a strength of 260 MPa, an elongation of 21.5%, and an average weight loss of 0.77 mg/（cm^2 days）.

关键词： Microstructure Mechanical property Corrosion resistance Ca addition Mg alloy

Mechanical properties and energy absorption of extruded Mg–2.0Zn–0.3Zr alloy with Y addition

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Rare Metals 2015年第5期34卷 314-323页

作者： Bin-Jiang Lv Jian Peng Yi Peng Ai-Tao Tang fu-sheng pan College of Materials Science and Engineering Chongqing University Chongqing Advanced Materials Research Center Chongqing Academy of Science and Technology

The effects of the rare earth element Y addition on mechanical properties and energy absorption of a low Zn content Mg-Zn-Zr system alloy and the deformation temperature of optimized alloy were investigated by room tensile test, optical microscopy （OM）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and transmission electron microscope （TEM）. The results show that, after homogenization at 420℃ for 12 h for the as-cast alloys, MgZn phase forms, which decreases the strength of Mg-2.0Zn-0.3Zr alloy with Y content of 0.9 wt%. The tensile strength and elongation of the alloy with a Y addition of 5.8 wt% reach the max value （281 ±2） MPa and （30.1 ± 0.7） %, respectively; the strength and elongation of Mg-2.0Zn-0.3Zr-0.9Y alloy at the optimized extrusion temperature of 330 ℃ reach （321 ± 1） MPa and （21.9 ± 0.7） %, respectively. The energy absorption increases with the increase of Y content, the max value reached 0.79 MJ·m^-3 with Y content of 5.8 wt%, and the energy absorption of Mg-2.0Zn-0.3Zr-0.9Y alloy at the optimized extrusion temperature of 330 ℃ reaches 0.75 MJ·m^-3.

关键词： Yttrium Microstructure Mechanical properties Energy absorption

A High-Ductility Mg–Zn–Ca Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2019年第1期32卷 23-30页

作者： Teng Tu Xian-Hua Chen Jiao Chen Chao-Yue Zhao fu-sheng pan College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Academy of Science and Technology

A new kind of Mg–2 Zn–0.6 Ca(wt%) alloy was fabricated by casting and hot extrusion as a high-ductility structural material. The extruded alloy exhibits a superior elongation of ～30%, yield strength of 130 MPa and ultimate tensile strength of 280 MPa along the extrusion direction at room temperature. Microstructure, texture and tensile properties of the extruded alloy were investigated in details. The remarkable improvement of ductility is ascribed to the weakened basal texture, refined grains and a small number of second phase in the alloy.

关键词： Magnesium alloy Mg–Zn–Ca High ductility Extrusion Texture

Effect of Mn Modification on the Corrosion Susceptibility of Mg–Mn Alloys by Magnesium Scrap

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Acta Metallurgica Sinica(English Letters) 2021年第1期34卷 1-11页

作者： Dong-Dong Gu Jian Peng Jia-Wen Wang Zheng-Tao Liu fu-sheng pan State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Chongqing Research Center for Advanced Materials Chongqing Academy of Science and TechnologyChongqing 401123China

The microstructure and anti-corrosion behavior of Mg–Mn alloys by magnesium scrap have been investigated in this *** results show that the size of the Fe-rich particles in magnesium scrap decreases but the quantity increases with the Mn *** the presence of Mn-containing Fe-rich particles with unique symbiotic structure can eff ectively weaken the micro-galvanic corrosion,the presence of more free Fe(Fe-rich particles)does not necessarily lead to severe corrosion of the *** corrosion susceptibility of Mg–Mn–Fe alloy primarily depends on the solubility of iron in the Mg matrix,while it can be significantly reduced by suitable Mn ***,the tolerance limit of the Fe impurity can be expressed as Femax=0.0083 Mn(relative to the iron solubility).Only when the Fe/Mn ratio is below 0.0083 can the alloy have excellent corrosion resistance,with the corrosion rate changing in the scope of 0.38±0.09 to 0.54±0.15 mg/cm^(2) day and icorr from 3 to 9×10^(–4) A/cm^(2).

关键词： Magnesium scrap Mn modification Fe impurity Corrosion susceptibility Corrosion resistance