On the bcc/B2 interface structure in a refractory high entropy alloy

0563166 - ÚFM 2024 RIV GB eng J - Článek v odborném periodiku
Kloenne, Z. T. - Couzinié, J. P. - Heczko, M. - Gröger, Roman - Viswanathan, G. B. - Clark, W. A. T. - Fraser, H. L.
On the bcc/B2 interface structure in a refractory high entropy alloy.
Scripta Materialia. Roč. 223, JAN (2023), č. článku 115071. ISSN 1359-6462. E-ISSN 1872-8456
Institucionální podpora: RVO:68081723
Klíčová slova: Refractory high-entropy alloy * Interface structure * Misfit dislocation * Nye tensor * Phase transformation
Obor OECD: Materials engineering
Impakt faktor: 6, rok: 2022
Způsob publikování: Open access
https://www.sciencedirect.com/science/article/pii/S1359646222005668?via%3Dihub

A refined microstructure consisting of bcc precipitates embedded in an ordered B2 matrix has been observed in the refractory high entropy alloy (RHEA) AlMo0.5NbTa0.5TiZr, resembling an inverted superalloy-like micro-structure. A planar {100} bcc/B2 interface exists in this state. Coarsening of the microstructure occurs after aging at 1000 degrees C for 6 h, resulting in a faceted interface. In this case, the primary plane of the interface is parallel to a {100} plane, while the step associated with the facet is parallel to a {110} plane. Misfit dislocations at the interface were observed on the {110} interface plane, with Burgers vector of a/2 111bcc, which extend into the bcc phase, and have an average spacing of 13.7 +/- 0.6 nm. No lattice invariant deformation (LID) normal to the primary {110} planes was observed, such that the transformation between the B2 and bcc phases constitutes a pure expansion.
Trvalý link: https://hdl.handle.net/11104/0341692