Dresden 2014 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session

MM 18.33: Poster

Monday, March 31, 2014, 18:00–20:00, P4

PAC studies of uniaxial compressive stressed zinc, titanium, rutile, Ti₂AlN, and Nb₂AlC — •Christoph Brüsewitz¹, Daniel Jürgens¹, Ulrich Vetter¹, Hans Hofsäss¹, and Michel W. Barsoum² — ¹II. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany — ²Dep. Mat. Sci. & Eng., Drexel University, Philadelphia, PA 19104, USA

Polycrystalline zinc, titanium, rutile, and the MAX phases Ti₂AlN and Nb₂AlC were studied with the perturbed angular correlation (PAC) method using ¹¹¹In/¹¹¹Cd as probe atom. The electric field gradient (EFG) at room temperature was studied as function of mechanical deformation caused by a uniaxial compressive load. A reversible and an irreversible increase in the distribution width of the EFG, visible as a damping of the PAC spectrum, were found under load and after releasing the load, respectively. Annihilation of dislocations, in agreement with the proposed incipient kink band (IKB) mechanism, as well as elastic deformation are considered to contribute to the reversible behavior. The irreversible behavior is caused by a permanent increase in dislocation and point defect density. The deformation induced broadening of the EFG can be recovered by post-annealing of the deformed sample.