Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8044203 | Vacuum | 2018 | 45 Pages |
Abstract
The constitutive behavior of AZ80â¯M magnesium alloy was investigated by using compression tests performed at the elevated temperature (400-470â¯Â°C) and in the semi-solid state containing a small fraction of liquid with different strain rates (0.001-0.1 sâ1), and the microstructure evolution was observed. Considering the influence of liquid phase, a more reasonable constitutive model to describe the peak stress both at the elevated temperature range and in the semi-solid state was obtained. It can be divided into two types: plastic deformation when the alloy is in the solid state (400-470â¯Â°C); thixotropic deformation when the alloy is in the semi-solid state (above 520â¯Â°C). The average relative errors between the experimental and calculated values are 2.1% and 2.6%, respectively. The activation energy (Q) in the semi-solid state is 289â¯kJ/mol, which is higher than in the elevated temperature. It is suggested that the presence of liquid phase causes the deformation mechanism in the semi-solid state obviously different from that at elevated temperature.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Qi Tang, Mingyang Zhou, Lingling Fan, Yuwenxi Zhang, Gaofeng Quan, Bin Liu,