Microstructural And Mechanical
Characterization Of Magnesium Based Alloy
MA14 (ZK60 A): Evolution Under Deformation
And Heat Treatment
Author(s)
E. F. Volkova
Abstract
The interest in magnesium based alloys as structural metal material is due to
their low weight, good mechanical and technological properties, high special
strength, etc. So magnesium basе alloys сan compete successfully in physical
and mechanical characteristics with other light structural materials especially in
the fields where decrease in the mass is of primary significance. The aim of the
present work was to study the influence of phase and structural changes in the
main properties of commercial magnesium basеd alloy MA14 (ZK60 A) under
deformation and heat treatment parameters. The microstructure was investigated
with the use of an optical inverted microscope. The phase composition was
investigated by chemical phase analysis with an X-ray analysis of each insulated
phase. It is found, that there are primary phases Mg2Zn3, ZrZn2 and Zr3Zn2.
Sometimes phases -ZrH2, -ZrH, Zr2Al can be present in phase composition. All
the phases are the hardеning ones. The phase quantity, size, morphology
correlate with the condition of the magnesium alloy so traditional deformation
and heat treatment has not had much influence on qualitative phase composition;
only on the phase and grain size. Now it is stated that the most effective
processing for receiving the elevated alloy properties is hydrostatic extrusion.
The final operation of hydrostatic extrusion of magnesium alloy semi products
causes the well-disposed structure and phase changes. Thus the high strength
properties of the cheap commercial magnesium alloy MA14 are obtained: tensile
strength is more than 380 MPa; tensile yield strength is more than 340 MPa.
Keуwords: magnesium alloy, microstructure evolution, hydrostatic extrusion,
high strength properties.
Keywords
Keуwords: magnesium alloy, microstructure evolution, hydrostatic extrusion,high strength properties.
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