Role of Y on the microstructure, texture and mechanical properties of Mg–Zn–Zr alloys by powder metallurgy

Ultra-fined Mg-5.1 wt%Zn-0.18 wt%Zr-3wt.%Y alloys (denoted as MY) were successfully fabricated via powder metallurgy (PM). The grain refinement, texture evolution, and twinning behaviors were systematically studied. Relationship between texture evolution and microscopic deformation mechanism is also...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-11, Vol.810, p.151843, Article 151843
Main Authors: Zhao, Lei, Ma, Guojun, Jin, Peipeng, Yu, Zihan
Format: Article
Language:English
Subjects:
Alloy powders
Alloying elements
Compacting
Compressive strength
Deformation mechanism
Deformation mechanisms
Dislocations
Evolution
Grain refinement
Magnesium
Magnesium-rare earth alloys
Mechanical properties
Powder metallurgy
Tension/compression asymmetry
Texture
Twinning
Yttrium
Zinc
Zirconium base alloys
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Summary:Ultra-fined Mg-5.1 wt%Zn-0.18 wt%Zr-3wt.%Y alloys (denoted as MY) were successfully fabricated via powder metallurgy (PM). The grain refinement, texture evolution, and twinning behaviors were systematically studied. Relationship between texture evolution and microscopic deformation mechanism is also discussed herein. Rare element (Y)-containing alloys with uniformly equiaxed fine grains exhibited weaker texture intensity. Deformation twinning in compression was hardly activated and replaced by dislocation and prismatic slips. The combined effect of the added Y and grain refinement resulted in the simultaneous enhancement of strength and ductility, especially for the compressive yield strength of the extruded alloy. And the tension/compression asymmetry of the material was significantly reduced due to the changed deformation mechanism. •Adding RE Y effectively refined the grains and achieved the microstructure homogenization.•The refined grains and precipitates effectively suppress twinning deformation.•The improvement in material properties was more pronounced than in similar alloys prepared by other processes due to the added Y.•Tension-compression asymmetry was also greatly reduced upon addition of Y.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.151843