Mechanical anisotropy due to twinning in an extruded AZ31 Mg alloy

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 485; no. 1; pp. 311 - 317
• Main Authors: Chino, Yasumasa, Kimura, Katsuya, Hakamada, Masataka, Mabuchi, Mamoru
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 25-06-2008; Elsevier
• Subjects: Applied sciences; AZ31; Cross-disciplinary physics: materials science; rheology; Elasticity. Plasticity; Exact sciences and technology; Magnesium; Materials science; Mechanical properties; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Other heat and thermomechanical treatments; Physics; Texture; Treatment of materials and its effects on microstructure and properties; Twin; Mechanical properties; AZ31; Magnesium; Texture; Twin; Grain size; Slip; Twinning; Compression test; Tension test; Anisotropy; Size effect; Magnesium alloy; Extrusion; Grain refinement
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2007.07.076

Tensile and compressive tests were performed at room temperature −673
K on extruded AZ31 alloy specimens with different (0
0
0
2) texture intensities and grain sizes, and effects of the temperature, grain size and texture on the tensile-compressive anisotropy were investigated. The mechanical anisotropy was closely related to generation of
{
1

0

1
¯

2
}
〈
1

0

1
¯

1
〉
twin. The mechanical anisotropy decreased with increasing temperature because the difference in twin generation between the tensile and compressive tests was reduced at elevated temperature. The (0
0
0
2) texture affected the mechanical anisotropy because the twin generation was enhanced during the compressive tests when the (0
0
0
2) plane was distributed parallel to the compressive direction. Also, because the twin generation was suppressed by grain refinement, the mechanical anisotropy was reduced by grain refinement. This suggests that the grain size dependence of the twinning is larger than that of the slip operation.