Abstract
The microstructural and mechanical properties, mainly the hardness, tensile properties and impact toughness of two phase Al–20 wt-%Zn alloy subjected to severe plastic deformation via equal channel angular pressing (ECAP) up to two passes, were studied. High cycle fatigue behaviour of ECAP processed alloy was investigated for the first time. The ECAP almost completely eliminated the as cast dendritic microstructure including casting defects such as microporosities and formed a refined microstructure consisting of elongated microconstituents, aluminium rich α and zinc rich α+η eutectoid phases. As a result of this microstructural change, the tensile response, impact toughness and fatigue performance of the alloy improved significantly. The rates of increase in endurance limit and impact toughness after ECAP are 89 and 122% respectively. In addition, a relationship represented by an equation between the stress amplitude σa and number of cycles to failure N values was determined to express the fatigue behaviour of the alloy in all states. It was also observed that the nature of fatigue fracture characteristics of the as cast Al–20 wt-%Zn alloy changed after ECAP.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
