Improving the plastic homogeneity of a magnesium alloy by introducing high volume fraction of twins during ambient extrusion

Ambient extrusion was conducted to impart different strains on an AZ31 magnesium alloy. Lamellar twins were observed in the strained samples, and twin density increased with strain. Uniaxial tensile tests were conducted on the extruded samples with different strains. An abnormal raise in elongation...

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Bibliographic Details
Published in:Journal of materials processing technology 2020-03, Vol.277, p.116445, Article 116445
Main Authors: Peng, Jinhua, Zhang, Zhen, Guo, Peng, Huang, Ji’an, Li, Yaozu, Zhou, Wei, Wu, Yucheng
Format: Article
Language:English
Subjects:
[formula omitted] twinning
Ambient extrusion
Crystal lattices
Elongated structure
Extrusion
Magnesium alloys
Magnesium base alloys
Necking
Plastic deformation
Tensile tests
Twinning
Uniform elongation
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Summary:Ambient extrusion was conducted to impart different strains on an AZ31 magnesium alloy. Lamellar twins were observed in the strained samples, and twin density increased with strain. Uniaxial tensile tests were conducted on the extruded samples with different strains. An abnormal raise in elongation was observed at higher strains with high volume fraction of 101¯1 twins. With the increase of extrusion strain, the elongation decreased initially and then got increased from a critical strain εcr without any sacrifice in strength. The basal texture was weakened due to twinning related crystal lattice rotation. Basal slip was thus easier to activate inside the twinned region to accommodate the plastic strain leading to an increase in elongation. The special twinning skeleton structure was expected to sustain a high stress to resist the necking.
ISSN:0924-0136
1873-4774
DOI:10.1016/j.jmatprotec.2019.116445