Microstructure and mechanical property of Mg–10Gd–2Y–1.5Zn–0.5Zr alloy processed by eight-pass equal-channel angular pressing

In this work, a high-strength Mg–10Gd–2Y–1.5Zn–0.5Zr (wt%) alloy was prepared via eight passes of equal-channel angular pressing (ECAP). The microstructures and mechanical properties of as-cast and ECAP alloys were systematically investigated by X-ray diffraction (XRD), optical microscopy (OM), scan...

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Bibliographic Details
Published in:Rare metals 2023-04, Vol.42 (4), p.1371-1377
Main Authors: Liu, Huan, Ju, Jia, Yang, Xiao-Wei, Li, Yu-Hua, Jiang, Jing-Hua, Ma, Ai-Bin
Format: Article
Language:English
Subjects:
Alloy systems
Alloys
Biomaterials
Casting alloys
Chemistry and Materials Science
Compression tests
Compressive strength
Deformation
Dendritic structure
Electron microscopy
Energy
Equal channel angular pressing
Fracture toughness
Gadolinium
High strength
Magnesium base alloys
Materials Engineering
Materials Science
Mechanical properties
Metallic Materials
Microscopy
Microstructure
Nanoscale Science and Technology
Optical microscopy
Physical Chemistry
Room temperature
Strain
X-ray diffraction
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Summary:In this work, a high-strength Mg–10Gd–2Y–1.5Zn–0.5Zr (wt%) alloy was prepared via eight passes of equal-channel angular pressing (ECAP). The microstructures and mechanical properties of as-cast and ECAP alloys were systematically investigated by X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electronic universal testing machine. The obtained results indicate that the microstructure of as-cast alloy consists of α-Mg dendrite, network Mg 3 (Gd,Y,Zn) phase and lamellar 14H long-period stacking ordered (LPSO) phase which is precipitated near the boundary of Mg 3 (Gd,Y,Zn) networks. After eight-pass ECAP, the network Mg 3 (Gd,Y,Zn) phase is deformed and broken. However, the refined Mg 3 (Gd,Y,Zn) particles are not distributed uniformly in the matrix, but still aggregated at the interdendritic area. Moreover, the content of 14H lamellas increases obviously, and they become bent and kinked during severe deformation. DRX is activated in the region between Mg 3 (Gd,Y,Zn) particles and 14H clusters. Compression test at room temperature indicates that the ECAP alloy exhibits excellent mechanical property with compressive strength of 518 MPa and fracture strain of 21.6%. The comprehensive high strength and toughness could be ascribed to the refined Mg 3 (Gd,Y,Zn) particles, DRX grains and kinked 14H LPSO phase.
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-018-1022-1