Analysis of Abnormal Texture and Strengthening Mechanisms of Extruded Mg–Gd–Y–Nd–Zr Alloy

Gao, Zexi; Liu, Chuming; Jiang, Shunong; Gao, Yonghao; Wan, Yingchun; Chen, Zhiyong

doi:10.1002/adem.202201046

Cited by 4 publications

(6 citation statements)

References 59 publications

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“…Notably, a weak C‐texture with <0001>//ED is found in the DRX grain subsets. According to our previous reports, [ 23,24 ] the basal texture can be weakened by CDRX and DDRX in Mg–Gd–Y–Zr alloys, but the formation of the C‐texture component is not directly related to DRX. In contrast, DRX provides only some small crystal nuclei with <0001>//ED, and the C‐texture component is closely dependent on the selected growth of grains with <0001>//ED during static recrystallization after completing the extrusion process.…”

Section: Resultsmentioning

confidence: 88%

Formation of Fine‐Grain Rings on the Surface Region of the Extruded Mg–Gd–Y–Zr–Ag Rod

et al. 2023

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Section: Resultsmentioning

confidence: 88%

Formation of Fine‐Grain Rings on the Surface Region of the Extruded Mg–Gd–Y–Zr–Ag Rod

et al. 2023

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“…The as-extruded alloy had a double-texture component, as shown by the (0001) pole diagrams and IPF figures, consisting of a typical fiber texture component with a

Mg orientation along the ED and an anomalous texture component oriented with (0001) base plane perpendicular to the ED. Previous studies [ 36 , 37 ] attributed the formation of anomalous textural compositions in Mg-RE-Zn alloys to anisotropic changes in the migration kinetics of grain boundaries due to the segregation of RE elements at the grain boundaries. Therefore, the anomalous texture intensity improves with elevated amounts of recrystallization and larger grain sizes.…”

Section: Resultsmentioning

confidence: 99%

The Development of a High-Strength Mg-10.3Gd-4.4Y-0.9Zn-0.7Mn Alloy Subjected to Large Differential-Thermal Extrusion and Isothermal Aging

Wang,

Wang

et al. 2023

Materials

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The large differential-thermal extrusion (LDTE) process, a novel approach for efficiently fabricating a high-strength Mg-10.3Gd-4.4Y-0.9Zn-0.7Mn (wt.%) alloy, is introduced in this work. Unlike typical isothermal extrusion processes, where the ingot and die temperatures are kept the same, LDTE involves significantly higher ingot temperatures (~120 °C) compared to the die temperature. For high-strength Mg-RE alloys, the maximum isothermal extrusion ram speed is normally limited to 1 mm/s. This research uses the LDTE process to significantly increase the ram speed to 2.0 mm/s. The LPTE-processed alloy possesses a phase composition that is similar to that of isothermal extruded alloys, including α-Mg, 14H-type long-period stacking ordered (LPSO) and β-Mg5(Gd, Y) phases. The weakly preferentially oriented α-Mg grains in the LDTE-processed alloy have <101¯0>Mg//ED fibrous and <0001>Mg//ED anomalous textures as their two main constituents. After isothermal aging, high quantitative densities of prismatic β′ and basal γ′ precipitates are produced, which have the beneficial effect of precipitation hardening. With a yield tensile strength of 344 MPa, an ultimate tensile strength of 488 MPa, and an elongation of 9.7%, the alloy produced by the LDTE process exhibits an exceptional strength–ductility balance, further demonstrating the potential of this method for efficiently producing high-strength Mg alloys.

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“…Simultaneously modulating the first and the second coordination shells can further tune the electronic structure of central metal sites for optimized electrocatalysis performance. [ 184 ] Doing this combines first shell coordination modulation that directly affects the electron distribution of the central atom and the second shell coordination that regulates the band gap of the active center through the long‐range electron delocalization effect. Therefore, the synergy of this double doping in the first and second/higher shells is critical for the coordination environment modulation of SACs.…”

Section: Modulation Of the Nitrogen Coordination Environmentsmentioning

confidence: 99%

“…As a result, the electronic structures of both metal atoms are optimized and the overall electronic conductivity is enhanced for catalytic performance improvement. [ 184 ] Xing et al prepared SAC with a cobalt bimetallic center coordinated by five nitrogen atoms (i.e., Co 2 N 5 ). [ 204 ] This was done by pyrolyzing ZnCo‐MOFs with different Zn to Co ratios to obtain Co clusters, Co 2 N 5 , or CoN 4 .…”

Section: Modulation Of the Metal Element Coordination Environmentsmentioning

confidence: 99%

Review of Carbon Support Coordination Environments for Single Metal Atom Electrocatalysts (SACS)

et al. 2023

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This topical review focuses on the distinct role of carbon support coordination environment of single atom catalysts (SACs) for electrocatalysis. The article begins with an overview of atomic coordination configurations in SACs, including a discussion of the advanced characterization techniques and simulation used for understanding the active sites. A summary of key electrocatalysis applications is then provided. These processes are oxygen reduction reaction (ORR), oxygen evolution reaction (OER), hydrogen evolution reaction (HER), nitrogen reduction reaction (NRR) and carbon dioxide reduction reaction (CO2RR). The review then shifts to modulation of the metal atom‐carbon coordination environments, focusing on nitrogen and other non‐metal coordination through modulation at the first coordination shell and modulation in the second and higher coordination shells. Representative case studies are provided, starting with the classic four‐nitrogen‐coordinated single metal atom (M‐N4) based SACs. Bimetallic coordination models including homo‐paired and hetero‐paired active sites are also discussed, being categorized as emerging approaches. The theme of the discussions is the correlation between synthesis methods for selective doping, the carbon structure – electron configuration changes associated with the doping, the analytical techniques used to ascertain these changes, and the resultant electrocatalysis performance. Critical unanswered questions as well as promising underexplored research directions are identified.This article is protected by copyright. All rights reserved

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Analysis of Abnormal Texture and Strengthening Mechanisms of Extruded Mg–Gd–Y–Nd–Zr Alloy

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adem.202201046.

Cited by 4 publications

References 59 publications

Formation of Fine‐Grain Rings on the Surface Region of the Extruded Mg–Gd–Y–Zr–Ag Rod

Formation of Fine‐Grain Rings on the Surface Region of the Extruded Mg–Gd–Y–Zr–Ag Rod

The Development of a High-Strength Mg-10.3Gd-4.4Y-0.9Zn-0.7Mn Alloy Subjected to Large Differential-Thermal Extrusion and Isothermal Aging

Review of Carbon Support Coordination Environments for Single Metal Atom Electrocatalysts (SACS)

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