INFLUENCE OF GRAIN REFINEMENT ON ANISOTROPY IN MECHANICAL PROPERTIES IN WROUGHT MAGNESIUM ALLOY AZ80

Authors

  • M. Shahzad Materials Division, Directorate of Technology, PINSTECH, P.O. Nilore, Islamabad, Pakistan
  • A. H. Qureshi Materials Division, Directorate of Technology, PINSTECH, P.O. Nilore, Islamabad, Pakistan
  • N. Hussain Materials Division, Directorate of Technology, PINSTECH, P.O. Nilore, Islamabad, Pakistan
  • L. Ali Department of Metallurgical & Materials Engineering, University of Engineering and Technology, Lahore, Pakistan

Abstract

A direct-chill (DC) cast magnesium alloys AZ80 has been forward-extruded in a single pass with total degree of deformation (φ = 2.5) at two temperatures 200 °C and 350 °C. The as-extruded round profiles have been analyzed for microstructural changes i.e. degree of recrystallization and recrystallized grain size, using optical microscopy. The crystallographic texture has been measured from X-ray diffraction using Co Kα radiation. The results show that the extent of grain refinement increases with the lowering extrusion temperature. The crystallographic texture in both conditions consists of a predominant < 1010 > component accompanied by a relatively weaker < 1120 > component in the extrusion direction. Although, the crystallographic texture at both extrusion temperatures remains fairly similar, a fine grain size achieved at lower extrusion temperature reduces the degree of anisotropy in yield stress. A fine grain size inhibits the nucleation of tensile twins under compressive loading and gives a higher compressive yield stress, thereby lowering the anisotropy in yield stress.

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Published

12-01-2011

How to Cite

[1]
M. Shahzad, A. H. Qureshi, N. Hussain, and L. Ali, “INFLUENCE OF GRAIN REFINEMENT ON ANISOTROPY IN MECHANICAL PROPERTIES IN WROUGHT MAGNESIUM ALLOY AZ80”, The Nucleus, vol. 48, no. 1, pp. 57–60, Jan. 2011.

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