Microstructural evolution and mechanical properties of cold-deformed al-5cu alloy samples after isothermal heat treatments
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2010
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Abstract.In this paper, the microscopic morphology of a semi solid Al5Cu alloy by strain induced melt activated (SIMA) process were investigated, and the effects of predeformation, microstructural evolution, aging response and hardness changes were determined. The microstructural observation shows that while the grain boundaries started to appear after 620°C, globular grains surrounded wet boundaries needed for SSP were obtained at 650°C. The grain sizes exhibited ununiformity from the outer surface to the center of the sample because of ununiform predeformation. Although isothermal heat treatments reduced hardness, age hardening gave back the hardness loss. © 2010 American Institute of Physics.