Effects of secondary phases on texture and mechanical properties of as-extruded Mg-Zn-Er alloys
(1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;
2. Huadian Electric Power Research Institute, Beijing 100124, China)
Abstract: The effects of kinds of secondary phases on texture and mechanical properties of Mg-Zn-Er alloys were investigated. The results suggest that the I-phase has a great effect on modification of the texture via the discontinuous dynamic recrystallization mechanism (DDRX), which tends to form well-developed equiaxed recrystallized grains. Meanwhile, the W-phase plays an important role in refining the grain size via continuous dynamic recrystallization (CDRX), companied with a higher maximum texture intensity. Thus, the Mg-6Zn-1Er alloy containing I-phase shows a performance of higher elongation of 20.4%. The Mg-2Zn-2Er alloy including W-phase displays a better tensile strength, and the yield strength (YS) is about 247 MPa.
Key words: Mg-Zn-Er alloy; dynamic recrystallization; texture; tensile properties