|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||G-35: Contribution of Lattice Distortion to Solid Solution Strengthening in a Group of Body-centered Cubic (bcc) High Entropy Alloys
||Hans Chen, Alexander Kauffmann, Stephan Laube, In-Chul Choi, Ruth Schwaiger, Franz Müller, Bronislava Gorr, Hans-Jürgen Christ, Martin Heilmaier
|On-Site Speaker (Planned)
Providing single-phase microstructures, dislocation mediated plasticity and varying atomic size differences δ in a wide range, NbMoCrTiAl and its derivatives are well-suited for investigating the impact of lattice distortion on solid solution strengthening in highly concentrated bcc alloys. The atomic size difference as a measure for the extent of lattice distortion was varied by systematically adjusting the Cr and Nb concentration in the quinary system Nb-Mo-Cr-Ti-Al. The investigated alloys were arc melted and homogenized to attain a single-phase microstructure. The determined interatomic spacings were used to recalculate the atomic radii for obtaining suitable values for δ of all alloys. The contribution of lattice distortion to solid solution strengthening was shown by correlating of δ with the according microhardness. Temperature-dependence of mechanical properties was further studied by nanoindentation and compression tests in the range between room temperature and 1200 °C to confirm the correlation of δ and athermal strength.
||Planned: Supplemental Proceedings volume