Enhanced Strength–Ductility Synergy of Mg–6Zn Alloy Wire by Inducing Guinier–Preston Zone Precipitation

Abstract

This paper designs a strategy of introducing ultrafine precipitates into single‐phase microstructure to enhance Mg‐6Zn alloy wire. Three combined processes including equal channel angular pressing (ECAP), direct extrusion, and multi‐pass drawing are used to produce 0.3mm diameter wire. The results show that an isothermal process of ECAP, extrusion, and drawing at 320°C (named route B) produces a near fully solid solution microstructure and causes a very high elongation of 21% as well as an ultimate tensile strength of 24MPa. Furthermore, on this basis, the addition of an aging treatment before drawing induces the precipitation of the GP zone in the near single‐phase Mg matrix and improves the tensile elongation to 28%, and the ultimate tensile strength also is increased to 290MPa.This article is protected by copyright. All rights reserved.