Plastic Work to Heat Conversion During High-Strain Rate Deformation of Mg and Mg Alloy

Creators: Ghosh, Dipankar; Kingstedt, Owen T.; Ravichandran, Guruswami

Abstract

Magnesium and magnesium alloy were investigated for plastic work to heat conversion (β). Thermomechanical response was measured employing the shear-compression specimen geometry, a split-Hopkinson pressure bar, and an infra-red detector. β of both materials measured to be less than the common assumption of 0.9; however, heat conversion was observed to be greater for magnesium alloy. Thus, results suggest that alloying and grain size refinement not only improved yield strength but also affected the thermomechanical response.

Additional Information

© 2016 The Minerals, Metals & Materials Society and ASM International. Manuscript submitted August 25, 2016. First Online: 20 October 2016. This research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-12-2-0022. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. The authors acknowledge Dr. Laszlo Kecskes and N. M. Krywopusk (US Army Research Laboratory) for the Mg and AZ31B samples and microstructural data. D.G. also acknowledges Mr. Thibaud Talon (graduate student, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA) for his help during the high-rate thermomechanical measurements.

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