Mechanical anisotropy of extruded Mg–6% Al–1% Zn alloy

✍ Scribed by S Kleiner; P.J Uggowitzer

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 209 KB
• Volume: 379
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2004.02.020

✦ Synopsis

Deformation anisotropy of extruded Mg–6% Al–1% Zn alloy has been investigated on specimens with different tilt angles relative to the extrusion direction. Calculations of the orientation factors for basal slip and of the strains caused by {10

1
̄

2} twinning were done for a slightly idealised texture. This quantification of the two dominating deformation modes was used to explain the marked mechanical anisotropy of the extruded magnesium alloy. Basal slip as well as {10

1
̄

2} twinning is inhibited in extrusion direction under tensile loads, which results in high yield strength. Any other testing direction and/or compressive loads are capable of activating slip and/or twinning and yield stress is significantly lower under such conditions. The lattice reorientation of 86.3° caused by twinning has a large influence on the deformation behaviour of a pre-deformed specimen, since the twinned areas are capable of untwinning during reloading in the opposite direction.