Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2017;6:129-35 DOI: 10.1016/j.jmrt.2016.05.005
Original Article
Achieving superplastic properties in a ZK10 magnesium alloy processed by equal-channel angular pressing
Roberto B. Figueiredoa,, , Terence G. Langdonb,c
a Department of Materials Engineering and Civil Construction, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
b Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, United Kingdom
c Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, United States
Received 25 February 2016, Accepted 13 May 2016
Abstract

Equal-channel angular pressing provides an opportunity for refining the grain structure and introducing superplastic properties in magnesium alloys. This report describes the use of this processing technique with a ZK10 (Mg–1.0wt.% Zn–0.26wt.% Zr) alloy. The grain structure was successfully refined from ∼12.9 to ∼5.2μm after 4 passes and superplastic elongations were observed when testing at low strain rates at temperatures of 473 and 523K. An analysis shows that the superplastic behavior is consistent with the conventional theoretical model for superplastic flow and at higher stresses and strain rates there is a transition to control by a viscous glide process.

Keywords
Equal-channel angular pressing, Magnesium alloy, Superplasticity, Viscous glide, ZK10
J Mater Res Technol 2017;6:129-35 DOI: 10.1016/j.jmrt.2016.05.005