Superplastic behavior of an ultrafine-grained Mg-13Zn-1 Superplastic behavior of an ultrafine-grained Mg-13Zn-1.55Y alloy with a high volume fraction of icosahedral phases prepared by high-ratio differential speed rolling Kwak T.Y., Kim W.J. a Rare Metal R&BD Group, Korea Institute of Industrial Technology, Incheon, Korea b Department of Materials Science and Engineering, Hongik University, Mapo-gu, Sangsu-dong 72-1, Seoul 121-791, Korea J. Mater. Sci. Technol.,2017,33(9),919-925.DOI:10.1016/j.jmst.2017.05.003