Weak increase of the dynamic tensile strength of aluminum melt at the insertion of refractory inclusions

AE Mayer and PN Mayer, COMPUTATIONAL MATERIALS SCIENCE, 114, 178-182 (2016).

DOI: 10.1016/j.commatsci.2015.12.040

We investigate the influence of refractory inclusions on the tensile strength of metal melt with the use of the molecular dynamics simulations by an example of Ti inclusions in Al melt. It is found that the strength of melt with a low volume fraction of inclusions is close to the strength of pure melt, while the increase of volume fraction provokes the higher system strength. This increment of the tensile strength does not exceed 10% at the volume fraction growth up to 0.5. The reason of the observed hardening consists in the presence of stiff unmelted inclusions leading to an increase of the strain rate in the molten aluminum around the inclusions in comparison with the strain rate of the system as a whole, while the dynamic strength rises together with the strain rate increase. Form and orientation of inclusions do not influence the tensile strength; the volume fraction of inclusions is a sole important parameter. (C) 2016 Elsevier B.V. All rights reserved.

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