MODELING MICROSTRUCTURAL FORMATION IN 2-PHASE ALUMINUM-ALLOYS AFTER HOT DEFORMATION

Aluminium of commercial purity and alloys containing 1 wt-%Mn or 1 wt- %Mg have been deformed in uniaxial compression at elevated temperature s. Analysis of the mechanical behaviour and the deformation microstruc ture has enabled the conditions under which dislocations accumulate at the large second phase particles to be identified. For most of the ma terials, the transition temperature is close to that found in earlier work on dilute aluminium alloys. However, it is found the manganese in solid solution may significantly raise the transition temperature, an d the results are analysed in terms of vacancy-diffusion controlled di slocation climb in alloys. (C) 1996 The Institute of Materials.