An AZ31 magnesium alloy tube has been deformed by the hot metal gas forming (HMGF) technique. Microstructures before and after deformation have been investigated by using Electron Backscattered Diffraction (EBSD) and Electron Microscopy. Due to the inhomogeneous distribution by induction heating, there is a temperature gradient distribution along the tube axis. Accordingly, the deformation mechanism is also different. In the middle area of deformation zone where the temperature is (similar to)410 degree C, almost no twinning has been found, whereas at the edge areas of deformation zone where the temperature is (similar to)200 degree C, a high density of twins has been found. EBSD experiments show a weak (0001) fiber texture along the radial direction of the tube before and after deformation in the high-temperature zone. EBSD experiments on the low temperature deformation region were not successful due to the high stored energy. Schmid factor analysis on the EBSD data shows that, despite the (0001) fiber texture, there are still many grains favoring basal slip along both the axis direction and hoop direction.
A microstructure study on an AZ31 magnesium alloy tube after hot metal gas forming process
Journal of Materials Engineering and Performance ; 16 , 3 ; 354-359
2007
6 Seiten, 19 Quellen
Aufsatz (Zeitschrift)
Englisch
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