Abstract
Abstract Aluminum-based metal matrix composites with various weight percentages (0, 2.5, 5, 7.5, and 10) of TiO2 reinforcement were synthesized by means of powder metallurgy and their workability behavior under triaxial stress-state conditions was completely studied during cold upsetting. Green cylindrical compacts were made using a 400 kN hydraulic press with suitable punch and die, sintered at (590 ± 10) °C for a period of 3 h, furnace cooled and machined to obtain samples with 0.5 aspect ratio. The cold upset tests were carried out in steps of 10 kN and the results were studied for the workability behavior of the composites. The formability stress index (β) and stress ratio parameters (σz/σeff), (σm/σeff), and (σθ/σeff) were calculated for all composites and correlated with true axial strain (∊ z ). It was observed that the addition of TiO2 to the Al matrix material increases the stress ratio parameters and formability stress index (β).
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