MICROSTRUCTURAL EVOLUTION DURING SEVERE DEFORMATION OF AZ31 MAGNESIUM ALLOY UNDER NON-ISOTHERMAL PROCESSING CONDITIONS |
|
Collaborators: N/A
|
|
Materials:
Nanomaterials
Metals
Application: Structural Technique: Processing Characterization |
|
Large plastic deformation was imparted to Mg alloy plate AZ31B by compressing along in-plane directions, in progressive stages below 300ºC, via non-isothermal processing method and under superimposed hydrostatic pressure. It was shown that by progressively lowering the deformation temperature, microstructures of ultra-fine grain size, approaching nanocrystalline structure could be obtained. Starting from a bimodal grain structure, the volume fraction of fine grains increased significantly as grain subdivision by a twinning mechanism was utilized to achieve grain refinement. X-ray diffraction results indicated that a strong basal fiber texture emerged normal to the original plate rolling direction, as a result of the new deformation mode, and a very high strength level for such alloys resulted due to reduced dynamic recovery effects. |