مشخصه یابی ریزساختارها و انحراف جهت گیری رشد دندریت فاز Al2Cu

Characterization of microstructures and growth orientation deviating

of Al2Cu phase dendrite at different directional solidification rates

مشخصه یابی ریزساختارها و انحراف جهت گیری رشد دندریت فاز Al2Cu

در نرخ های انجماد جهت دار مختلف 

ABSTRACT

At different directional solidification rates (10, 20 and 100 mm/s), microstructures and growth orientation variations of Al2Cu dendrite in Al-40%Cu alloy were characterized. When solidification rates were ranged from 10 to 100 mm/s, three-dimensional microstructure of Al2Cu dendrite changed from faceted L-shaped patterns to non-faceted complex dendrite morphology in transverse section. By the macro and micro orientation analysis characterize methods, [001] growth direction of Al2Cu dendrites with different morphologies was determined. The deviation angle between [001] direction and the heat flow direction was increased with solidified rate increasing. The experimental results showed that the regular solidified microstructure and growth orientation along the heat flow direction could be well controlled under lower directional solidification rate.