Magnesium alloy, microstructure, formability, biaxial loads
Magnesium AZ31B sheets of 2 mm thickness were stretch formed using a 101.6 mm diameter punch at temperatures from 25°C - 150°C, in 25°C increments. Surface strains were measured using a digital image correlation (DIC) method. The punch height vs load curve was found to be the same for temperatures of 25°C and for 50°C, while at 75°C and above the load for a given punch height started to decrease, indicating a potential change in deformation mechanism. Electron Backscatter Diffraction (EBSD) was used to quantify features of the microstructure in the tested specimens. In particular, the gradual decrease in twinning activity due to easier thermally activated slip with increasing temperatures is quantified across this range. Moreover, twin activity was found to predominantly involve the formation of compression twins that rapidly transform to create secondary twins for easier strain accommodation.
Original Publication Citation
Chelladurai, I., Miles, M.P., Fullwood, D.T. et al. JOM (2017) 69: 907. doi:10.1007/s11837-017-2309-7
BYU ScholarsArchive Citation
Fullwood, David T.; Chelladurai, Isaac; Miles, Michael P.; Carsley, John E.; Mishra, Raj K.; Beyerlein, Irene J.; and Knezevic, Marko, "Microstructure correlation with formability for biaxial stretching of magnesium alloy AZ31B at mildly elevated temperatures" (2017). Faculty Publications. 1864.
Ira A. Fulton College of Engineering and Technology
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