Development of dilute Mg-Bi alloy sheet with good synergy of corrosion-resistance and tensile properties

In this study, the role of microstructure in tailoring the mechanical properties and corrosion behaviors of as-rolled dilute Mg-Bi binary alloys (MB-x, where x 1/4 0.2 and 0.8 wt%) without/with Mg3Bi2 nanoprecipitates along the grain boundaries was systemically explored. The MB-0.8 alloy with Mg3Bi2 phases exhibited superior strength, ductility, and anticorrosion synergy (with a tensile yield stress of 235 MPa, ultimate tensile strength of 285 MPa, elongation of 10.3%, and Pi-168h of 0.105 mm/y). Strength-ductility synergy was achieved owing to the grain boundary strengthening and activation of prismatic and/ or pyramidal slip systems. The transformation of the corrosion mode inhibited the corrosion of the MB-0.8 alloy. Therefore, our approach provides an effective strategy for developing Mg alloys that exhibit superior characteristics.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).