Microstructure and mechanical properties of Mg-2Sn-1.95Ca-0.5Ce alloy with different extrusion speeds

Effects of extrusion speeds (0.3, 1.2, 1.8 and 3.5 mm s−1) on the microstructure and mechanical properties of the Mg-2Sn-1.95Ca-0.5Ce (TXCe220) alloy were analyzed by various detection methods in this article. The results have revealed that extrusion speed exerts a prominent influence towards grain...

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Bibliographic Details
Published in:Materials research express 2021-01, Vol.8 (1), p.16542
Main Authors: Wu, Jianxun, Shu, Hong, Zhang, Maochao, Chen, Yungui
Format: Article
Language:English
Subjects:
Alloys
dynamic recrystallization
Elongation
Extrusion rate
extrusion speed
Grain size
Low speed
magnesium alloy
Mechanical properties
Microstructure
Morphology
Precipitates
Recrystallization
Texture
Yield strength
Yield stress
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Summary:Effects of extrusion speeds (0.3, 1.2, 1.8 and 3.5 mm s−1) on the microstructure and mechanical properties of the Mg-2Sn-1.95Ca-0.5Ce (TXCe220) alloy were analyzed by various detection methods in this article. The results have revealed that extrusion speed exerts a prominent influence towards grain size, recrystallization fraction and texture. As the extrusion speed increases, the microstructure characteristics transform from bimodal grain morphology to the near complete dynamical recrystallization (DRX). The tensile yield strength of TXCe220 decreased from 365 MPa to 180 MPa accompanied by the elongation increasing from 4.0 % to 19.4 % when the ram speed rises from 0.3 mm s−1 to 3.5 mm/s. The high yield strength of low-speed extruded alloys should be mainly ascribed to the nano-scale Mg2Ca with diameter of 30-80 nm precipitates, fine DRX grains and strong texture.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/abdbf9