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Local decomposition induced by dislocation motions inside tetragonal Al(2)Cu compound: slip system-dependent dynamics.

ABSTRACT: Dislocations in a crystal are usually classified into several independent slip systems. Motion of a partial dislocation in monometallic crystals may remove or create stacking fault characterized with a partial of a lattice translation vector. However, it is recently known that motion of partial dislocations in complex structure, such as that inside an intermetallic Al2Cu compound, lead to a local composition deviation from its stoichiometric ratio and the resultant structure collapse. Here we report such a local decomposition behaviors are strongly dependent on slip system of dislocations. Under applied external stress, we have studied dislocation motion behaviors in the three independent slip systems of [001](110), [100]() and [110]() within tetragonal Al2Cu crystal by using molecular dynamics method. We found dislocation motions in all these slip systems result in local decomposition but their physical details differ significantly.

SUBMITTER: Chen D

PROVIDER: S-EPMC3819612 | biostudies-literature | 2013 Nov

REPOSITORIES: biostudies-literature

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Local decomposition induced by dislocation motions inside tetragonal Al(2)Cu compound: slip system-dependent dynamics.

Chen D D Ma X L XL

Scientific reports 20131107

Dislocations in a crystal are usually classified into several independent slip systems. Motion of a partial dislocation in monometallic crystals may remove or create stacking fault characterized with a partial of a lattice translation vector. However, it is recently known that motion of partial dislocations in complex structure, such as that inside an intermetallic Al2Cu compound, lead to a local composition deviation from its stoichiometric ratio and the resultant structure collapse. Here we re ...[more]

PMID: 24196169

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