Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster session I

MM 15.29: Poster

Montag, 7. März 2016, 18:00–20:00, Poster B3

Atomistic study of the growth of a B33 NiZr crystal from the melt: Observation of five- and tenfold twinning — •M. Guerdane — Karlsruhe Institute of Technology (KIT), IAM-CMS, Karlsruhe

The crystallization of Ni50Zr50 from the melt is studied by means of molecular dynamics simulation. We consider pseudo-two-dimensional growth by setting up cylindrical crystalline NiZr seeds with a CrB-type structure (B33) and which can grow freely in all directions perpendicular to the cylinder axis. The crystallization is characterized by the formation of a high density of almost stress-free twins. The structure of the twins is reminiscent of that of FeB-type as predicted by Parthe earlier [1]. Moreover, fivefold and tenfold twinning is observed. The twins-formation mechanism is discussed and compared with that in pure materials as well as with the recently observed tenfold (quasicrystalline) twinned dendritic microstructure in the NiZr system [2].

1. E. Parthe, Acta Cryst. (1976). B32, 2813

2. W. Hornfeck et al., arXiv:1410.2952 [cond-mat.mtrl-sci].