The High-Strain-Rate Constitutive Behavior and Shear Response of Pure Magnesium and AZ31B Magnesium Alloy

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 52; no. 7; pp. 3152 - 3170
• Main Authors: Cerreta, E. K., Fensin, S. J., Perez-Bergquist, S. J., Trujillo, C. P., Morrow, B. M., Lopez, M. F., Roach, C. J., Mathaudhu, S. N., Anghel, V., Gray, G. T.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.07.2021; Springer Nature B.V
• Subjects: Adiabatic flow; Characterization and Evaluation of Materials; Chemistry and Materials Science; Deformation; Dynamic recrystallization; Edge dislocations; High strain rate; Magnesium alloys; Magnesium base alloys; Materials Science; Metallic Materials; Nanotechnology; Original Research Article; Shear bands; Strain rate sensitivity; Structural Materials; Surfaces and Interfaces; Thin Films; Twinning
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-021-06312-7

The high-strain-rate response of pure magnesium and AZ31B magnesium alloy is examined in compression and in a forced shear-loading top-hat configurations. Compression specimens loaded in the direction normal to the plane of the rolled plate (TT) display higher-strain-rate sensitivity than specimens that were loaded within the plane of the rolled plate (IP). This effect is more pronounced for pure magnesium as compared to the alloy, due to increased twinning in the IP direction as compared to the TT. Additionally, top-hat shear specimens loaded at high strain rates are observed to display stable deformation during loading, and the development of adiabatic shear bands is not observed. We hypothesize that this result is due to adiabatic heating during deformation, which enhanced the contribution of slip, lessened the role twinning, and possibly activated dynamic recrystallization processes, thus, preventing the formation of distinct shear bands.