Dislocation-mediated plasticity in the Al2Cu theta-phase

D Andre and Z Xie and F Ott and JT Purstl and N Lohrey and WJ Clegg and S Sandlobes-Haut and S Korte-Kerzel, ACTA MATERIALIA, 209, 116748 (2021).

DOI: 10.1016/j.actamat.2021.116748

The deformation behaviour of the intermetallic Al2Cu theta-phase was investigated using atomistic simulations and micropillar compression, where slip on the unexpected 211 and 022 slip planes was revealed. Additionally, all possible slip systems for the intermetallic phases were further evaluated and a preference for the activation of slip systems based on their effective interplanar distances as well as the effective Bur gers vector is proposed. The effective interplanar distance corresponds to the manually determined interplanar distance, whereas the effective Burgers vector takes a potential dislocation dissociation into account. This new order is: 211(1/2)< 111 > , 022(1/2)< 111 > and 022 < 100 > , 110 < 001 > , 310 < 001 > , 022 < 011 > , 110(1/2)< 111 > , 112 < 110 > and 112(1/2)< 111 > from high to low ratio of d(eff)/b(eff). Also, data on the critical resolved shear stresses of several of these slip systems were measured. (C) 2021 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

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