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Microstructure and Mechanical Properties in Friction Stir Welded Thick Al–Zn–Mg–Cu Alloy Plate

Acta Metallurgica Sinica(English Letters) 2022年第8期35卷 1329-1342页

作者： Fei Qiang Wen Wang Ke Qiao Pai Peng Ting Zhang Xiao-Hu Guan Jun Cai Qiang Meng Hua-Xia Zhao Kuai-She Wang School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials ProcessingXi'an University of Architecture and TechnologyXi'an 710055China Northwest Institute for Non-Ferrous Metal Research Xian 710016China AVIC Manufacturing Technology Institute Bejing 100024China Beijing FSW Technology Co.Ltd Bejing 101107China

In this work, 20-mm-thick aluminum-alloy plates were joined via friction stir welding. The temperature gradient was reduced by reducing the surface welding heat input to achieve uniformity of the mechanical properties across the thick plate joints. The welding temperature was measured using thermocouples. The microstructures were observed via electron backscatter diff raction and transmission electron microscopy. The tensile properties of the samples sliced along the thickness direction of the joint were evaluated. The results show that the highest welding peak temperature is 430℃ on the advancing side on the top surface of the joint. The grain size gradually decreased along the thickness direction, and grain refi nement was due to the combination of continuous, discontinuous, and geometric dynamic recrystallization. The tensile properties of the sliced samples were found to be uniform, and the ultimate tensile strength reached 62% of that of the base metal. The main strengthening mechanism of the Al–Zn–Mg–Cu alloy joints consists of precipitation strengthening. In addition, the η ` → η phase transition and grain coarsening in the heat-affected zone were found to be responsible for the fracture of the joints.

关键词： Friction stir welding Aluminum alloy thick plate Dynamic recrystallization Mechanical properties precipitated phase

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Effects of stress loading mode on microstructures and properties of Mg-9Gd-2Nd-0.5Zr alloy treated by creep aging

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Journal of Magnesium and Alloys 2023年第11期11卷 4263-4273页

作者： Simin Shen Yongpeng Zhuang Ming Li Hongxia Wang Lifei Wang Weili Cheng Hang Li Hua Hou Kwangseon Shin College of Materials Science and Engineering Shanxi Key Laboratory of Advanced Magnesium based MaterialsTaiyuan University of TechnologyTaiyuan 030024China Southwest Technology and Engineering Research Institute ChongqingP.R.China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering North University of ChinaTaiyuan 030051China Magnesium Technology Innovation Center School of Materials Science and EngineeringSeoul National UniversityGwanak-roGwanak-guSeoul 08826Korea

Creep aging forming(CAF) is a potential process used to manufacture large integral components of magnesium(Mg) alloys. The selected stress plays a crucial role in creep aging processes but the mechanism by which stress loading method affects creep aging of Mg alloys is still unclear. In this paper, the microstructural evolution of precipitated phases and precipitation-free zones(PFZ) at grain boundaries with different stress loading modes(unstressed, unidirectional tensile stress, and cyclic stress) at 250 ℃ were investigated along with changes in mechanical properties. The results showed that the addition of stress during aging effectively promoted the precipitation of precipitated phases, while unaffecting grain size. Unidirectional tensile stress caused directional growth of β phase([1010]), as well as rotation of weave towards the basal plane texture, resulting in namely stress orientation effect. Solute atoms diffused in the direction of tensile stress while vacancies moved perpendicular to the direction of tensile stress, resulting in PFZ at grain boundaries(157.06 nm). By contrast, cyclic stresses led to the growth of β phase in three directions([1010], [1100] and [0110]). The solute atoms and vacancies were uniformly distributed in the Mg matrix instead of directional diffusion, effectively reducing the width of PFZ(112.39 nm) at the grain boundary. These features significantly improved the mechanical properties of alloy specimens after cyclic stress creep aging when compared to unidirectional stress creep aging, with yield strength(YS), ultimate tensile strength(UTS), and elongation(EL) enhanced from 171.6 MPa, 305.5 MPa, and 4.4%to 174.8 MPa, 326.3 MPa, and 6.9%, respectively.

关键词： Mg-9Gd-2Nd-0.5Zr alloy precipitated phase Stress orientation effect PFZ Mechanical properties

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Microstructure and texture evolution of Mg–7Y–1Nd–0.5Zr alloy sheets with different rolling temperatures

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Rare Metals 2020年第11期39卷 1273-1278页

作者： Jing-Bao Liu Kui Zhang Jing-Tao Han Xing-Gang Li Yong-Jun Li Ming-Long Ma Jia-Wei Yuan Guo-Liang Shi State Key Laboratory for Fabrication and Processing of Nonferrous Metals Beijing General Research Institute for Nonferrous MetalsBeijing100088China School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China

The extruded Mg-7Y-1Nd-0.5Zr(wt%)alloy were performed to the same strain hot rolling with different *** microstructure and texture evolution of the sheets were investigated by optical microscopy(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),and electron back-scattered diffraction(EBSD).The results indicate that the microstructure becomes homogeneous after hot rolling process and precipitated phase distributes at grain boundaries along rolling *** the increase in rolling temperature,the grains of sheet grow *** sheet rolling at 400℃is composed of recrystallization grains,the necklace of the precipitated phase in the grain boundaries and excessive *** structure of necklace of the precipitated phase is fcc structure with lattice constant of a=0.75 *** rolling temperatures increasing from 400 to 450℃,the content of recrystallized grains in volume fraction with relatively random orientations increases *** with the rolling process at 400℃,the amount of precipitated phases is reduced at the grain boundary,and the precipitated phase begins to appear in the grain interior when rolling at 450℃.The structure of the precipitated phase is fcc with lattice constant of a=2.22 *** recrystallization grains begin to grow in the rolling process at 500℃.The basal texture is obviously produced during the rolling process at 400 and 450℃;however,the basal texture is weak in the rolling process at 500℃.

关键词： Rare earth magnesium alloy Rolling Texture precipitated phase

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Microstructure of Steel 5Cr21Mn9Ni4N Alloyed by Rare Earth

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Journal of Iron and Steel Research(International) 2006年第2期13卷 40-44页

作者： YU Shi-chang ZHU Qiu-hua WU Shen-qing GONG You-jun GONG Yuan-sheng LIAN Ming-sheng YE Gang CHENG Yi-jun Department of Material Science and Engineering Southeast University Nanjing 210096 Jiangsu China Technology Center Jiangsu Shenyuan Special Steel Company Xinghua 225722 Jiangsu China

The microstructure, composition and shape of precipitated phase under as-cast and finished product state of 5Cr21Mn9Ni4N steel with different rare earth （RE） amount were studied. Mechanical properties of 5Cr21Mn9Ni4N steels withont RE addition and with RE added by 0. 2% in mass percent were tested respectively. The results indicate that the solid solution amount of RE is about 10^-6 -10^-5 order of magnitude in 5Cr21Mn9Ni4N steel. Dendrite of as-cast condition is refined obviously and dimension of interstitial phase is shortened when RE is added by 0.10%-0.20%. But the microstructure will be coarser if surplus RE is added. precipitated phase under finished product state distributes evenly in nearly same size with RE added by 0. 2% which leads to a largely improved high temperature mechanical property.

关键词： rare earth 5Cr21Mn9Ni4N steel microstructure precipitated phase

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Effect of Structure Pattern on the Performance of X80 Pipeline Steel

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Journal of Iron and Steel Research(International) 2011年第S1期18卷 874-877页

作者： REN Yi,LIU Wen-yue,WANG Shuang,ZHANG Shuai (Technical Center of Anshan Iron & Steel Co.Ltd.,Anshan 114009,Liaoning,China) Anshan Iron & Steel Co Ltd Ctr Tech Anshan 114009 Liaoning Peoples R China

The microstructure,dislocation and precipitation phases of X80 pipeline steel produced with different processes were analyzed by optical microscope and transmission electron microscope (TEM) contrastively,and the influence of structure pattern on the performance of X80 pipeline steel was *** result shows that the effects of acicular ferrite grain size,precipitate phase distribution,dislocation density and morphology on the material strength,toughness and brittle transmission temperatures were distinct,and solid solution strengthening,fine grain strengthening,dislocation strengthening and precipitation strengthening were the strengthening ways of X80 pipeline steel.

关键词： pipeline steel acicular ferrite dislocation precipitated phase toughness

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Strength mismatch mechanism on friction stir welding joint of 7075 aluminum alloy

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China Welding 2021年第1期30卷 30-36页

作者：朱浩董少康赵熠朋王晨霁王军朱绍金 School of Materials Science and Engineering Shijiazhuang TIEDAO UniversityShijiazhuang 050043China Hebei Key Laboratory of Advanced Materials for Transportation Engineering and Environment Shijiazhuang 050043China School of Materials Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018China China Petroleum Pipeline Engineering Co.LTD Langfang 065000China

The precipitated phases in the WNZ,TMAZ,HAZ and BM of the friction stir welding(FSW)joint were observed using the transmission electron microscopy(TEM)and the lattice fringe spacing of the precipitated phases was *** with X-ray diffraction(XRD),the types of precipitated phases among the joint were confirmed and then the strength mismatch mechanism was *** results show the precipitated phases of 7075 aluminum alloy FSW joint mainly consist of MgZn_(2),AlCuMg and Al_(2)*** microzone of the joint experienced different thermal cycles,the types and sizes of precipitated phases are different and the strengthening effect is *** strengthening effect of the AlCuMg and Al_(2)CuMg are better than that of MgZn_(2).The precipitated phase in the WNZ mainly includes AlCuMg and Al_(2)CuMg,as well as the grain size is fine,the microhardness in this zone is pretty *** number of precipitated phase AlCuMg and Al_(2)CuMg is smaller in the TMAZ and the MgZn_(2)is relatively more,which lead the microhardness *** number of precipitated phase MgZn_(2)is relative larger in the HAZ,as well as the grain coarsening,the microhardness in this zone is lowest of the *** the same time,there are the precipitate free zones(PFZ)among the 7075 aluminum alloy FSW joint,which decreases the microhardness of the whole joint to some extent.

关键词： 7075 aluminum alloy friction stir welding precipitated phase the precipitate free zones strength mismatch

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