|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Synthesis and Mechanical Characterisation of a Single-phase bcc High-entropy Alloy
||Tim Lienig, Michael Feuerbacher, Carsten Thomas
|On-Site Speaker (Planned)
In-depth understanding of structure-property relations of High-Entropy Alloys (HEAs) requires the investigation high-quality single-phase, preferably single-crystalline samples. Single-crystalline samples allow the determination of intrinsic materials properties without the influence of secondary phases or grain boundaries. We report on the synthesis of the single-phase equiatomic bcc Ti-V-Zr-Nb-Hf HEA and our advancements in the growth of a single-crystal of this material. This bcc HEA is of special interest, since it exhibits a considerably lower melting point, compared to the Senkov alloy. Poly-crystalline samples are prepared from high-purity elements by means of arc- and levitation melting and a subsequent heat treatment. Single-crystals are grown by means of the Bridgman technique. These well-defined materials are employed for the characterisation of mechanical properties and plastic deformation behaviour of the bcc HEA. By incremental testing, e.g. stress relaxations, strain-rate changes and temperature-cycling, thermodynamic activation parameters of the plastic deformation mechanism are determined.