Abstract
Abstract Simultaneous achievement of low-temperature superplasticity (LTSP) below 0.5Tm (Tm: melting temperature) and high-strain-rate superplasticity (HSRS) above 0.5Tm from the identically processed material is advantageous for industrial applications. Severe plastic deformation by high-ratio differential speed rolling (HRDSR) with different roll speed ratios (2 and 3) was applied to cast Mg–Y–Zn–Zr alloys with the eutectic icosahedral phase (I-phase) structure. Two types of microstructures were obtained, depending on the roll speed ratio. The alloy processed at a speed ratio of 3 (HRDSR3) had an ultrafine-grained microstructure (∼1 μm) and finely broken eutectic I-phase particles. The alloy processed at a speed ratio of 2 (HRDSR2) also had an ultrafine grained microstructure, but with a higher fraction of non-fully fragmented original grains and a lower density of fine I-phase particles (
Published Version
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 call