|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||In-situ Methods for Unraveling Structure-Property Relationships in Light Metals
||Analysis of Microstructure and Damage Evolution in Ultra-thin Wires of the Magnesium Alloy MgCa0.8 at Multipass Drawing
||Andrij Milenin, Piotr Kustra, Dorota Byrska-Wˇjcik, Olexandr Grydin, Mirko Schaper, Thorben Mentlein, Gregory Gerstein, Florian NŘrnberger
|On-Site Speaker (Planned)
A combined multipass hot and cold drawing process was implemented to manufacture ultra-thin wires of the magnesium alloy MgCa0.8 with a final diameter of 0.05 mm. FE simulations were applied to design the drawing process of 40 passes regarding the microstructure evolution. Parameters such as the recrystallized material volume fraction or the damage criterion were calculated. To parametrize the corresponding models, stress relaxation hot deformation tests as well as in situ tensile tests in a scanning electron microscope were performed. Analysis of the MgCa0.8 wires featuring diameters below 0.1 mm revealed no intergranular crack initiation, which is usually a damage reason of the MgCa0.8 alloy at the microscale. The grain size of the ultra-thin wires is within the range of 30 nm to 500 nm where the grains are elongated in the drawing direction depending on the deformation parameters. The fine-grained microstructure provides high mechanical strength properties of the alloy.