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Microstructure and damping properties of lpso phase dominant Mg-Ni-Y and Mg-Zn-Ni-Y alloys

Journal of Magnesium and Alloys 2024年第3期12卷 1131-1153页

作者： Ruopeng Lu Kai Jiao Nanting Li Hua Hou Jingfeng Wang Yuhong Zhao College of Materials Science and Engineering North University of ChinaTaiyuan 030051China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

This work studied the microstructure,mechanical properties and damping properties of Mg_(95.34)Ni_(2)Y_(2.66) and Mg_(95.34)Zn_(1)Ni_(1)Y_(2.66)alloys *** difference in the evolution of the long-period stacked ordered(lpso)phase in the two alloys during heat treatment was the *** morphology of the as-cast Mg_(95.34)Ni_(2)Y_(2.66)presented a disordered *** heat treatment at 773 K for 2 hours,the eutectic phase was integrated into the matrix,and the lpso phase maintained the 18R *** Zn partially replaced Ni,the crystal grains became rounded in the cast alloy,and lamellar lpso phases and more solid solution atoms were contained in the matrix after heat treatment of the Mg_(95.34)Zn_(1)Ni_(1)Y_(2.66)*** Zn and the heat treatment had a significant effect on *** dislocation internal friction peaks and grain boundary internal friction peaks were found after temperature-dependent damping of the Mg_(95.34)Ni_(2)Y_(2.66)and Mg_(95.34)Zn_(1)Ni_(1)Y_(2.66)*** heat treatment,the dislocation peak was significantly increased,especially in the alloy Mg_(95.34)Ni_(2)Y_(2).*** annealed Mg_(95.34)Ni_(2)Y_(2.66)alloy with a rod-shaped lpso phase exhibited a good damping performance of 0.14 atε=10^(−3),which was due to the difference between the second phase and solid solution atom *** factors also affected the dynamic modulus of the *** results of this study will help in further development of high-damping magnesium alloys.

关键词： Mg-Ni-Y alloys Mg-Zn-Ni-Y alloys lpso phase Heat treatment Microstructure Damping properties.

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Effect of extrusion temperature on microstructure and tensile properties of Mg-Gd-Er-Zn-Zr alloy containing lpso phase

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Journal of Iron and Steel Research International 2023年第8期30卷 1633-1641页

作者： Si-shu Wang Qian-hao Zang Hong-mei Chen Yu-hang Guo Feng-jian Shi Di Feng School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina Foshan(Southern China)Institute for New Materials Foshan 528247GuangdongChina

The Mg-1Gd-0.75Er-0.5Zn-0.18Zr(at.%)alloy with long-period stacking ordered(lpso)phase was prepared by metal mold casting and hot *** extruded samples had a typical bimodal *** different fractions of equiaxed grains were observed in annealed *** percentage of fine grains decreased in the extruded Mg alloys with and without annealing treatment when the extrusion temperature was *** lpso phases promote recrystal-lization behavior in the samples through particle-stimulated nucleation(PSN)*** Mg alloys extruded at 300℃ with or without annealing treatment obtained the best tensile *** the low extrusion temperature,more finely equiaxed grains with random texture are formed through PSN,and more lpso phase kink bands are formed,which could improve the mechanical properties of the extruded Mg alloys.

关键词： Mg alloy lpso phase Recrystallization Texture Tensile property

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Enhanced mechanical properties and degradation rate of Mg-Ni-Y alloy by introducing lpso phase for degradable fracturing ball applications

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Journal of Magnesium and Alloys 2020年第1期8卷 127-133页

作者： Jingfeng Wang Shiqing Gao Xiuying Liu Xing Peng Kui Wang Shijie Liu Weiyan Jiang Shengfeng Guo Fusheng Pan National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Faculty of Materials and Energy Southwest UniversityChongqing 400715China

In this work,as-cast Mg-Ni-Y alloys were proposed to develop a feasible material for fracturing balls,and their mechanical performance and corrosion behavior were systematically *** period stacking order(lpso)phase was firstly introduced to improve both the mechanical properties and degradation rate of magnesium *** the increase of lpso phase,the compressive strength was improved significantly,while the elongation of the alloys decreased owing to the relatively brittle nature of lpso *** to the higher corrosion potential of lpso phase,the lpso phase can accelerate the corrosion process by providing more ***,the lpso phase would serve as the corrosion barrier between the corrosion medium and the matrix when the contents of lpso phase are too high in Mg92.5Ni3Y4.5 and Mg87.5Ni5Y7.5 ***-cast Mg97.5Ni1Y1.5 alloy with satisfactory mechanical properties and rapid degradation rate was successfully developed,exhibiting a high degradation rate of 6675 mm/a(93℃)in 3 wt.%KCl solution and a favorable ultimate compressive strength of 410 *** degradation rate of Mg97.5Ni1Y1.5 alloy is 2-5 times of the current commercial magnesium alloy fracturing materials.

关键词： Mg-Ni-Y magnesium alloys Fracturing ball lpso phase Degradation rate Mechanical properties

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Hot deformation of Mg-Y-Zn alloy with a low content of the lpso phase studied by in-situ synchrotron radiation diffraction

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Journal of Magnesium and Alloys 2020年第1期8卷 199-209页

作者： Klaudia Horváth Fekete Daria Drozdenko Jan Capek Kristián Máthis Domonkos Tolnai Andreas Stark Gerardo Garcés Patrik Dobron Department of Physics of Materials Faculty of Mathematics and PhysicsCharles UniversityKe Karlovu 512116 PragueCzech Republic Nuclear Physics Institute of the CAS 25068ˇRežCzech Republic Magnesium Research Center Kumamoto University2-39-1 Kurokami Chuo-ku860-8555 KumamotoJapan Laboratory for Neutron Scattering and Imaging Paul Scherrer InstituteVilligen PSI5232Switzerland Institute of Materials Science Helmholtz-Zentrum GeesthachtMax-Planck Str.1GeesthachtD21502Germany Department of Physical Metallurgy CENIM-CSICAvenida Gregorio del Amo 8E-28040 MadridSpain

The compressive deformation behavior of the extruded WZ42(Mg98.5Y1Zn0.5 in at.%)magnesium alloy containing a low amount of long-period stacking ordered(lpso)phase was studied by in-situ synchrotron radiation diffraction *** were conducted at temperatures between room temperature and 350℃.Detailed microstructure investigation was provided by scanning electron microscopy,particularly the backscattered electron imaging and electron backscatter diffraction *** results show that twinning lost its dominance and kinking of the lpso phase became more pronounced with increasing deformation *** cracks of the lpso phase and no debonding r at the interface between the lpso phase and the Mg matrix were observed at temperatures above 200℃.At 350℃,the lpso phase lost its strengthening effect and the deformation of the alloy was mainly realized by the dynamic recrystallization of the Mg matrix.

关键词： Magnesium alloy lpso phase Kinking High temperature Synchrotron radiation diffraction

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Deformation behavior of Mg-Y-Ni alloys containing different volume fraction of lpso phase during tension and compression through in-situ synchrotron diffraction

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Journal of Magnesium and Alloys 2024年第9期12卷 3631-3645页

作者： S.Z.Wu Y.Q.Chi G.Garces X.H.Zhou H.G.Brokmeier X.G.Qiao M.Y.Zheng School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China Department of Physical Metallurgy CENIM-CSICAvenida Gregorio del Amo 828040 MadridSpain Institute of Materials Science and Engineering Clausthal University of TechnologyAgricolastrasse 6D-38678 Clausthal-ZellerfeldGermany

The deformation behavior of the as-extruded Mg-Y-Ni alloys with different volume fraction of long period stacking ordered(lpso)phase during tension and compression was investigated by in-situ synchrotron *** micro-yielding,macro-yielding,tension-compression asymmetry and strain hardening behavior of the alloys were explored by combining with deformation *** micro-yielding is dominated by basal slip of dynamic recrystallized(DRXed)grains in tension,while it is dominated by extension twinning of non-dynamic recrystallized(non-DRXed)grains in *** macro-yielding,the non-DRXed grains are still elastic deformed in tension and the basal slip of DRXed grains in compression are ***,the lpso phase still retains elastic deformation,but can bear more load,so the higher the volume fraction of hard lpso phase,the higher the tensile/compressive macro-yield strength of the *** from the low volume fraction of the non-DRXed grains and the delay effect of lpso andγphases on extension twinning,the as-extruded alloys exhibit excellent tension-compression *** the volume fraction of lpso phase reaches∼50%,tension-compression asymmetry is reversed,which is due to the fact that the lpso phase is stronger in compression than in *** tensile strain hardening behavior is dominated by dislocation slip,while the dominate mechanism for compressive strain hardening changes from twinning in theα-Mg grains to kinking of the lpso phase with increasing volume fraction of lpso *** activation of kinking leads to the constant compressive strain hardening rate of∼2500 MPa,which is significantly higher than the tensile strain hardening rate.

关键词： Mg-Y-Ni alloys lpso phase In-situ synchrotron diffraction Micro-yielding Tensile-compression asymmetry Strain hardening

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Characterization of a Mg_(95.5)Zn_(1.5)Y_(3)alloy both containing W phase and lpso phase with or without heat treatment

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Journal of Magnesium and Alloys 2017年第2期5卷 217-224页

作者： Li Zhumin Wan Diqing Huang Yi Ye Shuting Hu Yinglin School of Materials Science and Engineering East China Jiaotong UniversityNanchang 330013China Materials Research Group Faculty of Engineering and the EnvironmentUniversity of SouthamptonSouthampton SO171 BJUK

The influence of solid solution treatment on the microstructure and corrosion resistance of as-cast Mg_(95.5)Zn_(1.5)Y_(3) alloy is *** microstructure of the as-cast Mg_(95.5)Zn_(1.5)Y_(3) alloy mainly consisted ofα-Mg,W(Mg_(3)Zn_(3)Y_(2))phase,and the long period stacking ordered(lpso)(Mg_(12)ZnY)*** solid solution treatment,most of the W phase disappears gradually with increasing solution treatment time,with only a small amount of W phase distributed as *** lpso phase slightly dissolved into substrate,and its morphology transitions from blocky shape to rod *** solution treatment of Mg_(95.5)Zn_(1.5)Y_(3) exhibits excellent corrosion resistance,because the Y and Zn atoms became enriched in the matrix and the changed morphologies of the lpso and W phases were modified through heat *** alloy created with solid solution treatment at 520 ℃ for 10 hours exhibits corrosion potential of−1.419 V,suggesting a significant improvement in corrosion performance.

关键词： Magnesium alloys lpso phase Solid solution treatment Corrosion resistance

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Effects of solid solution treatment and cooling on morphology of lpso phase and precipitation hardening behavior of Mg-Dy-Ni alloy

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Transactions of Nonferrous Metals Society of China 2017年第11期27卷 2381-2389页

作者： Li-tao YUAN Guang-li BI Yuan-dong LI Jing JIANG Yu-xiang HAN Da-qing FANG Ying MA State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou 730050 China College of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan 030024 China

Effects of solid solution treatment and cooling on the morphology of long period stacking order(lpso)phase and precipitation hardening behavior of Mg?2Dy?0.5Ni(molar fraction,%)alloy were *** of the as-cast alloy mainly consisted ofα-Mg phase,bamboo-like Mg12DyNi phase with lpso structure distributed between dendrites and small amounts of cubic Dy *** solid solution treatment at565oC for12h and subsequent different cooling conditions,dot-shaped,block,fine lamellar and rod-shaped lpso phases precipitate in Mg matrix,*** continuous cooling conditions(furnace and air cooling),the fine lamellar lpso phase generally forms in grain interior and its volume fraction increases and block lpso phase coarsens with increasing cooling *** discontinuous cooling conditions(air cooling after furnace cooling to415and265°C),the dot-shaped lpso grows into the rod-shaped phase,which results in an decrease of cooling hardening behavior of alloy.

关键词： Mg.Dy.Ni alloy lpso phase microstructure precipitation hardening

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Mechanical property and anisotropy of as-extruded Mg-Zn-Y-Mn alloys with different volume fraction of long-period stacking ordered(lpso) phase

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Journal of Rare Earths 2024年第12期42卷 2259-2269页

作者： Dahui Liang Mincong Chen Chuanqiang Li Zhipei Tong Yong Dong Dong Bian School of Materials and Energy Guangdong University of Technology Medical Research Institute Department of Orthopedics Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences) Southern Medical University

Effects of different volume fraction of long-period stacking ordered(lpso) phase on the microstructure,mechanical property and anisotropy of the as-extruded Mg-xZn-yY-0.1Mn(x = 1 wt%, 2 wt%, 4 wt% and y = 2 wt%, 4 wt%, 8 wt%) alloys were studied by an optical microscope, a scanning electron microscope,texture analysis, a transmission electron microscope and tensile testing. The results reveal that the volume fraction of lpso phase increases from ZW12 to ZW24 to ZW48 alloys with the elevating Zn and Y content but constant Y/Zn value, and the mechanical strength of the lpso-containing Mg-Zn-Y-Mn system is gradually improved when increasing lpso phases. With the highest volume fraction of lpso phase, ZW48 alloy presents the highest ultimate tensile strength(UTS) of 427 MPa along the extrusion direction(ED) when compared with those of ZW12 alloy with the UTS of 307 MPa and ZW24 alloy with the UTS of 347 MPa. Moreover, the elongation ratio of ZW48 alloy is maintained to moderate 9.9%, which is also the highest among three studied alloys. On the other hand, texture analysis demonstrates that the basal texture of the a-Mg phase in the ZW48 alloy is significantly weakened by the generation of more lpso phases. On the contrary, a high texture intensity of a-Mg phase and obvious mechanical anisotropy can be observed for the ZW12 alloy. However, mechanical anisotropy still exists in the ZW48 alloy containing massive lpso phases, which is attributed primarily to the zonal distribution of large lpso along the ED.

关键词： lpso phase Mechanical anisotropy Mg–Zn–Y–Mn alloy Microstructure Rare earths Texture

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Strengthening mechanisms in magnesium alloys containing ternary Ⅰ,W and lpso phases

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Journal of Materials Science & Technology 2018年第7期34卷 1110-1118页

作者： N.Tahreen D.F. Zhang F.S. Pan X.Q. Jiang D.Y. Li D.L. Chen Department of Mechanical and Industrial Engineering Ryerson University Toronto Ontario MSB 2K3 Canada College of Materials Science and Engineering Chongqing University Chongqing 400045 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China Advanced Materials Research Center ChongqingAcademy of Science and Technology Chongqing 401123 China Faculty of Materials and Energy Southwest University Chongqing 400715 China Department of Chemical and Materials Engineering University of Alberta Alberta T6G 11-19 Canada

This study was aimed at identifying underlying strengthening mechanisms and predicting the yield strength of as-extruded Mg-Zn-Y alloys with varying amounts of yttrium （Y） element. The addition of Y resulted in the formation of ternary 1 （Mg3YZn6）, W （Mg3Y2Zn3） and lpso （Mg12YZn） phases which subse- quently reinforced alloys ZM31 ＋ 0.3Y, ZM31 ＋ 3.2Y and ZM31 ＋ 6Y, where the value denoted the amount of Y element （in wt%）. Yield strength of the alloys was determined via uniaxial compression testing, and grain size and second-phase particles were characterized using OM and SEM. In-situ high-temperature XRD was performed to determine the coefficient of thermal expansion （CTE）, which was derived to be 1.38 x 10^-5 K^-1 and 2.35 x 10^-5 K^-1 for W and lpso phases, respectively. The individual strengthening effects in each material were quantified for the first time, including grain refinement, Orowan looping, thermal mismatch, dislocation density, load-bearing, and particle shearing contributions. Grain refinement was one of the major strengthening mechanisms and it was present in all the alloys studied, irrespective of the second-phase particles. Orowan looping and crE mismatch were the predominant strengthening mechanisms in the ZM31＋0.3Y and ZM31 ＋ 3.2Y alloys containing I and W phases, respectively, while load-bearing and second-phase shearing were the salient mechanisms contributing largely to the superior yield strength of the lpso-reinforced ZM31 ＋ 6Y alloy.2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： Magnesium alloy I-phase W-phase lpso phase Strengthening mechanism

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High strength and ductility of cast Mg-9Gd-1.5Y-0.8Zn-0.3Zr alloy achieved by microstructural regulation

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Progress in Natural Science:Materials International 2023年第6期33卷 797-803页

作者： Daiyi Deng Renju Cheng Zhihua Dong Bin Jiang Mingbo Yang Haijun Wang Chuntang Yu Yanlong Ma Fusheng Pan College of Materials Science and Engineering Chongqing University of Technology College of Materials Science and Engineering Chongqing University

This work reports a high strength and ductility as-casted Mg-9Gd-1.5Y-0.8Zn-0.3Zr(wt.%) alloy by using the optimized heat treatment of a lower solid-solution temperature of 480°C and then aging at 200°C for 48 h with the ultimate tensile strength and yield strength reached 374(±2.0) MPa and 270.5(±5.5) MPa, respectively,whilst a high elongation of 10.1(±1.3) % was achieved. The high strength and ductility are found to emerged primarily from the synergic influence of long period stacking ordered(lpso) phases and the nano-β’precipitates:at lower temperature of 480°C the alloy preserved a large number of block and lamellar 14H-lpso phases at the grain boundaries and the smallest size of β’precipitates led to a better ductility and higher strength. While at higher temperatures solid-solution treatment of 500°C and 520°C, the strength and ductility declined slightly due to the lamellar or filminess lpso formed in the grains, and especially the precipitation of cubic-shaped REenriched phases and rod-like Zn–Zr compounds. Particularly when the solid solution temperature reached as high as 520°C, the strength was significantly reduced due to the increase of the cubic-shaped RE-enriched phases. We suppose that the efficiency of the morphology and position of lpso phases on the ductility strengthening of the alloy is block and lamellar lpso phases in the grain boundaries > lamellar or filminess lpso phases in the grains.

关键词： Mg-Gd-Y-Zn-Zr alloy High strength and ductility Magnesium alloy lpso phase Heat treatment

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