Abstract
Phase transitions in CuAlMn alloys containing up to 12 at% Mn and 27 at% Al continuously heated up to 550 o C were studied using differential scanning calorimetry and transmission electron microscopy. Alloys containing lss than 4.8 at% Mn exhibit an exothermal heat effect in the range 280 - 380 o C due to γ 2 precipitation. The additional endothermal peak above 500 o C is caused by DO 3 disordering. Alloys of intermediate Mn and Al content show only a reversible martensitic and ordering transformations during repeated cycling in the range -50 to + 550 o C. Alloys of higher Mn (6 - 12 at%) and lower Al content exhibit a diffused exothermal peak in the range 320 - 450 o C due to bainitic plates possess 9R structure. They contain more Cu and less Mn and Al when compared to initial alloy compositions. Precipitates of γ 2 compositions lie close to its equilibrium phase limits
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