Determination of the flow stress model of az80 mg alloy

Toko Tokunaga¹, Roman Kuziak², Kiyotaka Matsuura³

¹Research Fellow of Japan Society for the Promotion of Science, PhD student, Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan.
²Institute for Ferrous Metallurgy, Gliwice, Poland.
³Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan.

DOI:

https://doi.org/10.7494/cmms.2014.2.0482

Abstract:

The flow stress model of AZ80 Mg alloy, whose grain size is approximately 30 μm, is created by interpreting the experimental results with the inverse analysis. Compression tests were conducted at temperatures of 523, 573 and 623 K and at strain rates of 0.01, 0.1 and 1 s-1. On the basis of the test results, the flow stress model of the Mg alloy was determined. As candidates of the flow stress model, three equations were selected and the coefficients in those equations were determined by using the inverse analysis and optimization process. In the optimization process, the measured and calculated loads were compared and the difference between them was minimized as objective functions. Consequently, the flow stress equation was chosen and the coefficients were determined. Reasonably good agreements of measured and calculated results were obtained with the equation which can be taken into account not only the softening but also the saturation of the flow stress due to the dynamic recrystallization.

Cite as:

Tokunaga, T., Kuziak, R., & Matsuura, K. (2014). Determination of the flow stress model of az80 mg alloy. Computer Methods in Materials Science, 14(2), 123 – 130. https://doi.org/10.7494/cmms.2014.2.0482

Article (PDF):