High-Throughput Mapping Method for Mechanical Properties, Oxidation Resistance, and Phase Stability in Ni-Based Superalloys Using Composition-Graded Unidirectional Solidified Alloys

Abstract

Abstract We propose a new approach for the high-throughput experimental evaluation of the phase stability, mechanical and oxidation properties of a Ni-based superalloy. The Bridgman method is used to introduce the gradation of nine elements in a long distance (∼24 mm) and a wide range of microstructural features with η, μ and γ’ phase volume fractions in one sample. Nanoindentation and microstructural observations are utilized to extract the elastic modulus/hardness of a γ-γ’ two-phase structure and evaluate the oxidation layers in an oxidized sample. Our approach makes it possible to obtain huge number of datasets linked to the composition and microstructure of the superalloys.