Tensile strength of Al matrix with nanoscale Cu, Ti and Mg inclusions
VV Pogorelko and AE Mayer, XXXI INTERNATIONAL CONFERENCE ON EQUATIONS OF STATE FOR MATTER (ELBRUS 2016), 774, UNSP 012034 (2016).
Molecular-dynamic investigations of Al+Cu, Al+Ti and Al+Mg nanocomposite strength under high-rate uniaxial tension were carried out in this work. We consider two different mechanisms of reduction of the tensile strength of a material with inclusions in comparison with a pure material of matrix. The first mechanism is connected with a stress concentration in matrix near a stiff and strong inclusion (Ti, Cu); in this case, the fracture occurs inside the matrix and does not touch the inclusion. The second mechanism acts in the case of a soft and weak inclusion (Mg); the fracture begins inside the inclusion and thereafter propagates into the matrix. The tensile strength of the systems is determined at varied strain rates (in the range from 0.1/ns to 30/ns at the temperature 300 K) and varied temperatures (in the range from 300 K to 900 K at the strain rate 1/ns).
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