Strength enhancement of Mg-based alloys without deteriorating their ductility is currently a major scientific and industrial challenge. In this study, discs of as-cast EZ33A alloy were processed by high-pressure torsion (HPT). The coarse-grained cast material was turned to ultrafine-grained (UFG) of ∼240 nm, ∼135 nm and ∼127 nm size, after 1, 3 and 10 turns, respectively. Simultaneously, hardness increased from 60 HV for the as-cast material to 90–95 HV after HPT processing. Samples subjected to various HPT routes showed enhanced ultimate tensile strength of 270 MPa, along with their uniform elongation up to 10%. The simultaneous increase of strength and ductility was attributed to the bimodal grain size distribution, as well as to the fragmentation and redistribution of brittle (Mg,Zn)12Ce phase.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering