|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Magnesium Technology 2017
||Microstructure Evolution during Tensile Tests and Its Correlation with Ductility of Mg Sheets
||Zhuoran Zeng, Mingzhe Bian, Shiwei Xu, Chris Davies, Nick Birbilis, Jian-Feng Nie
|On-Site Speaker (Planned)
Hot-rolled sheets of dilute Mg-Zn-Ca alloys are promising for automotive applications because of their low cost and better ductility than AZ31 sheets. However, the origin of their better ductility is controversial, primarily due to the lack of direct observations of microstructure evolution in these sheets during tensile tests. In the present study, the Mg-0.3Zn-0.1Ca, Mg-0.4Zn and Mg-0.1Ca (all in at. %) sheets are hot-rolled at 450°C and annealed at 400°C. Their ductility is measured by tensile tests at room temperature. It is found that the ductility of the ternary alloy sheet is much better than those of binary alloys. To understand the difference in ductility of these alloy sheets, their microstructures, such as traces of dislocation slips, twinning, cracking, and texture at different stages of tensile testing are systematically monitored using a quasi-in-situ EBSD method, and results are compared. The correlations between microstructural evolution and alloy ductility will be discussed.