Per: José Amilton Cardoso de oliveira filho (Universidade Federal do Ceará), Breno Rabelo Coutinho Saraiva (Universidade Federal do Ceará), João Rodrigues de Barros Neto (Universidade Federal do Piauí), Francisco Bruno Alexandre GÖmes (Universidade Federal Do Ceará), Hamilton Ferreira Gomes de Abreu (Universidade Federal do Ceará), Daniel Rodrigo Leiva (Universidade Federal de São Carlos), Wágner Batista Silva (Universidade Federal de São Carlos)
Abstract:
The interest in magnesium alloys has been exponentially grown, due to its better mechanical properties bound to low density compared with other metals, being widely qualified in automotive industries. This scientific work pursues to improve the mechanical properties of pure magnesium and its alloy EZ33 through the ECAP technique, crucially aiming to analyse the temperature’s effect on hardness and relate with the microstructure. The ECAP process have been made using a die with process parameters such as internal channel of 120º and using the Bc route, following, each sample, the extrusion sequence conditions: 4 passes at 300ºC, then at 250ºC and condition M (1 pass at 300ºC, at 275ºC, at 250ºC and 225ºC), with a pressing speed of 5 mm/min. Then, the analyses were made: microstructure, EDS, and hardness. The alloy showed promising results, presenting higher values in its mechanical properties, mainly on M condition, increasing approximately 15% in hardness, and, for the pure Mg, 32%. The microstructure revealed the diminishing of about 57 and 37 times in grain size for the alloy and pure Mg, respectively. Hence, the magnesium alloys processed by ECAP are considerably optimized in their mechanical and microstructural properties, contributing to higher quality applications.