Influence of Degree of Deformation on Anisotropy in Mechanical Properties in Wrought Magnesium Alloy ZK60

M. Shahzad; A.H. Qureshi; H. Waqas; N. Hussain

doi:10.4028/www.scientific.net/KEM.510-511.554

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Influence of Degree of Deformation on Anisotropy in Mechanical Properties in Wrought Magnesium Alloy ZK60

Abstract:

A direct-chill (DC) cast magnesium alloys ZK60 has been forward-extruded at 300 °C in a single pass at two extrusion ratios (ER) 12 and 44, which correspond to a total degree of deformation (φ) of 2.5 and 3.8, respectively. The as-extruded microstructure in both cases consists of two colonies of grain sizes, i.e. about 15 µm and <5 µm, and highly deformed original grains which have not recrystallized. The crystallographic texture at both extrusion ratios consists of a predominant component accompanied by a relatively weaker component in the extrusion direction. Although, the qualitative crystallographic texture at both extrusion ratios remains fairly similar, a higher extrusion ratio gives a relatively weaker basal texture. A relatively higher degree of DRX and much lesser volume fraction of coarse grains (>25 µm) at higher extrusion ratios give significantly weaker strength differential effect (difference in tensile yield stress and compressive yield stress).