Effect of Dynamically Recrystallized Grains on Rare Earth Texture in Magnesium Alloy Extruded at High Temperature

Li, Rongguang; Fu, Guang; Xu, Zeren; Su, Yong; Hao, Yongsheng

doi:10.1002/adem.201700818

Cited by 3 publications

(4 citation statements)

References 25 publications

(37 reference statements)

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“…Due to the phenomenon of particle-stimulated nucleation (PSN), precipitates also influence grain size, especially if they have a high volume fraction [ 11 ]. Owing to the hexagonal close-packed (HCP) structure of Mg alloys, their mechanical behavior also depends on the activation of different dislocation slip systems, which is influenced by their texture [ 12 , 13 , 14 ]. Li et al proposed that a Yb addition effectively refined recrystallized grains and yielded dense Mg–Zn–Yb nanoprecipitates that could inhibit grain boundary migration, and also could promote the formation of the RE texture component [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Modification of the Tensile Performance of an Extruded ZK60 Magnesium Alloy with the Addition of Rare Earth Elements

et al. 2023

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The influence of rare earth (RE) elements on the microstructure and mechanical performance of an extruded ZK60 Mg alloy was studied. Two types of RE elements were added to a ZK60 material and then extruded at a ratio of 18:1. The first new alloy contained 2 wt% Y while the second one was produced using 2 wt% Ce-rich mischmetal. The microstructure, the texture, and the dislocation density in a base ZK60 alloy and two materials with RE additives were studied by scanning electron microscopy, electron backscattered diffraction, and X-ray line profile analysis, respectively. It was found that the addition of RE elements caused a finer grain size, the formation of new precipitates, and changes in the initial fiber texture. As a consequence, Y and Ce-rich RE elements increased the strength and reduced the ductility. The addition of these two types of RE elements to the ZK60 alloy decreased the work hardening capacity and the hardening exponent mainly due to grain refinement.

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Section: Introductionmentioning

confidence: 99%

Modification of the Tensile Performance of an Extruded ZK60 Magnesium Alloy with the Addition of Rare Earth Elements

et al. 2023

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“…In addition, rare earth can be connected to electron‐rich atoms through coordination bond ,. In view of the above excellent performance, rare‐earth compounds are mostly used for electrode materials, supercapacitors, catalyst material and so on. However, the research on tribology is relatively few.…”

Section: Introductionmentioning

confidence: 99%

Ceria/reduced Graphene Oxide Nanocomposite: Synthesis, Characterization, and Its Lubrication Application

Min

Liu

et al. 2019

ChemistrySelect

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Reduced graphene oxide nanosheet decorated with uniform ceria (CeO2) nanoparticles was prepared via a simple hydrothermal method. The anchored CeO2 nanoparticles with diameters of 3.5‐4.5 nm were well distributed on reduced graphene oxide (rGO) nanosheets. The as‐prepared CeO2/rGO nanocomposites can be highly dispersed into the paraffin oil to form a stable monodisperse solution at the broad temperature range from −7°C to 160°C. The tribological performance of CeO2/rGO nanocomposites as oil lubricant additives was systematically investigated using a MS−T3000 ball‐on‐disk tester. The results indicated that paraffin oil with 5 wt% CeO2/rGO exhibited the best lubrication performance in terms of the lowest friction coefficient and wear rate compared to only GO or CeO2 nanoparticles as lubricant additives. Notably, the base oil filled with CeO2/rGO revealed the excellent tribological properties as friction coefficient and wear rate separately decreased by 15.85% and 76.03%, in comparison with the base paraffin oil. Moreover, optical microscope images of the wear surface of the steel disc as well showed that CeO2/rGO nanocomposites exhibited higher anti‐wear capability than GO nanosheet and CeO2 nanoparticles. The unique tribological properties of CeO2/rGO suggested the synergistic friction reduction and anti‐wear mechanism of rGO nanosheet and CeO2 nanoparticles.

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“…On the one hand, the texture is related with the alloying elements. [5][6][7][8][9][10][11][12][13][14][15][16][17][18] However, the texture evolution of Mg alloy with the high content of Gd during annealing has not been investigated in detail in previous literature. [1][2][3][4] While the rare earth (RE) containing Mg alloys exhibit weaker basal textures during extrusion compared with the RE-free alloys such as AZ31 and AZ61.…”

mentioning

confidence: 99%

“…[5][6][7][8][9][10] It has been reported that addition of little La or Gd element can produce a weak texture with <11-21>||ED orientation during lower extrusion temperature, [10] and the extruded rods with high content of Gd exhibit a weak texture with <0001>||ED orientation. [5][6][7][8][9][10][11][12][13][14][15][16][17][18] However, the texture evolution of Mg alloy with the high content of Gd during annealing has not been investigated in detail in previous literature. The texture evolution of strong texture with <0001>?ED in conventional extruded Mg alloys during annealing has been widely reported.…”

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confidence: 99%

An Unusual Texture Evolution in Extruded Mg–14Gd–Based Alloy during Annealing

Zhang

et al. 2018

Adv Eng Mater

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Texture evolution during annealing in various wrought Mg alloys is still controversial and texture control is an effective way of reducing mechanical anisotropy and improving secondary formability for Mg alloys. In this study, the electron backscattered diffraction (EBSD) method is used to monitor the texture evolution during the annealing process of a Mg-14Gd-2Ag-0.5Zr extruded bar. The novel phenomenon, that is, the texture evolution from <0001>?ED to <0001> ||ED, or rather, the increase fraction of grains with <0001> ||ED accompanied by the decrease fraction of grains with <0001>?ED, is found and discussed in the high-RE containing Mg alloy for the first time. The effect factors, stored energy in different textured grains and grain boundary misorientation, are mentioned to analyze the texture evolution.Texture control is an effective and important way of reducing mechanical anisortropy and improving the secondary formability for Mg alloys. On the one hand, the texture is related with the alloying elements. A strong basal texture with <0001>?ED (extrusion direction) would develop during extrusion of conventional Mg alloys such as AZ31 and AZ61. [1][2][3][4] While the rare earth (RE) containing Mg alloys exhibit weaker basal textures during extrusion compared with the RE-free alloys such as AZ31 and AZ61. [5][6][7][8][9][10] It has been reported that addition of little La or Gd element can produce a weak texture with <11-21>||ED orientation during lower extrusion temperature, [10] and the extruded rods with high content of Gd exhibit a weak texture with <0001>||ED orientation. [11][12][13] On the other hand, the process technologies and subsequent heat treating can affect the texture. The texture evolution of strong texture with <0001>?ED in conventional extruded Mg alloys during annealing has been widely reported. [1,4] For example, the main <10-10>||ED texture can evolve into <11-20>||ED one during annealing in extruded AZ31 alloy due to the preferential growth of grains having <11-20>||ED texture component by a high mobility of boundaries. [1] Some researchers also refer to the extrusion texture in RE-containing Mg alloys. [5][6][7][8][9][10][11][12][13][14][15][16][17][18] However, the texture evolution of Mg alloy with the high content of Gd during annealing has not been investigated in detail in previous literature. The extruded Mg-14Gd-2Ag-0.5Zr has exhibited a good combination of strength and ductility and has the great potential in engineering applications. [13] Therefore, in this work, we further studied the texture evolution of this extruded alloy during annealing, and this paper reports the novel phenomenon about the texture evolution, which contribute to the texture control of high-performance Mg-RE alloys. Experimental SectionThe Mg-14Gd-2Ag-0.5Zr (wt%) alloy investigated was prepared from purity Mg, Gd, Ag and Mg-33Zr (wt%) master alloy in a mild steel crucible under a protection of CO 2 and SF 6 atmosphere. The ingot was manufactured by direct-chill semicontinuous casting method. The as-cast bill...

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Effect of Dynamically Recrystallized Grains on Rare Earth Texture in Magnesium Alloy Extruded at High Temperature

Cited by 3 publications

References 25 publications

Modification of the Tensile Performance of an Extruded ZK60 Magnesium Alloy with the Addition of Rare Earth Elements

Modification of the Tensile Performance of an Extruded ZK60 Magnesium Alloy with the Addition of Rare Earth Elements

Ceria/reduced Graphene Oxide Nanocomposite: Synthesis, Characterization, and Its Lubrication Application

An Unusual Texture Evolution in Extruded Mg–14Gd–Based Alloy during Annealing

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