Effect of solute content and temperature on the deformation mechanisms and critical resolved shear stress in Mg-Al and Mg-Zn alloys

The influence of solute atoms (Al and Zn) on the deformation mechanisms and the critical resolved shear stress for basal slip in Mg alloys at 298 K and 373 K was ascertained by micropillar compression tests in combination with high-throughput processing techniques based on the diffusion couples. It...

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Bibliographic Details
Published in:Acta materialia 2019-05, Vol.170, p.155-165
Main Authors: Wang, J.-Y., Li, N., Alizadeh, R., Monclús, M.A., Cui, Y.W., Molina-Aldareguía, J.M., LLorca, J.
Format: Article
Language:English
Subjects:
Basal slip
Diffusion couples
Mg alloys
Micropillar compression
Solution hardening
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Summary:The influence of solute atoms (Al and Zn) on the deformation mechanisms and the critical resolved shear stress for basal slip in Mg alloys at 298 K and 373 K was ascertained by micropillar compression tests in combination with high-throughput processing techniques based on the diffusion couples. It was found that the presence of solute atoms enhances the size effect at 298 K as well as the localization of deformation in slip bands, which is associated with large strain bursts in the resolved shear stress (τRSS)-strain (ε) curves. Deformation in pure Mg and Mg alloys was more homogeneous at 373 K and the influence of the micropillar size on the critical resolved shear stress was much smaller. In this latter case, it was possible to determine the effect of solute content on the critical resolved shear stress for basal slip in Mg-Al and Mg-Zn alloys. [Display omitted]
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2019.03.027