Texture and Anisotropy Parameters of Pressed MA14 Alloy Pipes Produced by Granule Metallurgy Methods

Resumo

The effect of the granular technology on the formation of the crystallographic texture during the extrusion of MA14 magnesium alloy pipes with a diameter of 105 mm and a wall thickness of 5 mm was studied. The pipes were manufactured from pressed workpieces fabricated by hot molding compaction of magnesium granules, which were produced by centrifugal spraying of melt in a helium gas medium at the cooling rate of 10⁴–10⁵ K/s. The texture of the pipes was characterized by the arrangement of the prism poles along the axial direction; the reduction of the wall thickness of a pipe significantly exceeded that of its diameter and, as a result, a basal texture similar to that of magnesium sheets was formed in its walls. A procedure was proposed for calculating the yield locus making it possible to estimate the yield stresses for any kind of stress on the basis of Hill’s yield criterion for anisotropic materials.