Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2017;6:329-33 DOI: 10.1016/j.jmrt.2017.06.006
Original Article
Evaluation of hardening and softening behaviors in Zn–21Al–2Cu alloy processed by equal channel angular pressing
José Luis Hernández-Riveraa,, , Esperanza Elizabeth Martínez Floresb, Emmanuel Ramírez Contrerasb, Jorge Garcia Rochab, Jose de Jesus Cruz-Riverab, Gabriel Torres-Villaseñorc
a CONACYT-Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
b Instituto de Metalurgia-Facultad de Ingeniería, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
c Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
Received 30 May 2017, Accepted 30 June 2017
Abstract

The microstructural evolution of as-cast and homogenized Zn–21Al–2Cu samples after two and six passes in an equal channel angular pressing (ECAP) at room temperature was reported. A homogenization treatment for 24h at 350°C was applied to the as-cast samples followed by deformation. An annealing heat treatment was performed on all samples after the ECAP process. Our results showed that the homogenized and deformed samples displayed a uniform fine-grained microstructure after annealing, while as-cast samples without homogenization treatment presented only some regions of fine-grained microstructure. The level of microsegregation was higher in the as-cast samples as compared to the homogenized ones even after annealing. Vickers microhardness measurement on samples after deformation is smaller than the original material indicating a softening. However, after the annealing treatment, the microhardness increased, indicating that there was a slight hardening of the material.

Keywords
Severe plastic deformation, ECAP, Work softening, Annealing, Hardening, Fine grain
J Mater Res Technol 2017;6:329-33 DOI: 10.1016/j.jmrt.2017.06.006