Effect of Gd and Y contents on the microstructural evolution of long period stacking ordered phase and the corresponding mechanical properties in Mg–Gd–Y–Zn–Mn alloys

This study analyzes the effect of different Gd and Y contents on the microstructural evolution and mechanical properties of Mg–Gd–Y–Zn–Mn alloys. Microstructural analysis indicates the existence of both the long period stacking order and eutectic phases in the as-cast alloys. In case of alloys with...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-08, Vol.612, p.363-370
Main Authors: Huang, Song, Wang, Jingfeng, Hou, Fan, Huang, Xiuhong, Pan, Fusheng
Format: Article
Language:English
Subjects:
Alloys
Annealing
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Eutectics
Exact sciences and technology
Grains
Heat treatment
Long-period stacking ordered phase
Magnesium alloy
Magnesium base alloys
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Mechanical property
Metals. Metallurgy
Microstructure
Physics
Production techniques
Stacking
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
Yttrium base alloys
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Summary:This study analyzes the effect of different Gd and Y contents on the microstructural evolution and mechanical properties of Mg–Gd–Y–Zn–Mn alloys. Microstructural analysis indicates the existence of both the long period stacking order and eutectic phases in the as-cast alloys. In case of alloys with high Gd and low Y contents, the main eutectic phase is (Mg,Zn)3(Gd, Y), while in alloys with high Y and low Gd contents, the main eutectic phase is Mg24(Gd,Y,Zn)5. The as-annealed alloys show only α-Mg and LPSO phases; the LPSO phases could be bulk-shaped and lamellar-shaped. The main composition of the LPSO phase with gray bulk-shaped morphology is Mg12ZnY, while the LPSO phase that penetrated thoroughly the grain is mainly Mg12ZnGd. After extrusion, the formation of distorted grains and lamellar-shaped LPSO phases in the alloys with high Gd and low Y contents tends to improve the strength of the as-extruded alloys, while the formation of isometric crystal grains in the alloys with high Y and low Gd contents enhances the alloy elongation.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2014.06.063