SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 40: Mechanical Properties and Allloy Design

MM 40.8: Vortrag

Donnerstag, 30. März 2023, 17:45–18:00, SCH A 251

Diffusion and phase stability in a HCP HfScTiZr multicomponent alloy — •Mohan Muralikrishna Garlapati¹, Sandipan Sen¹, Xi Zhang², Sankaran S³, Juliana Schell^{4, 5}, Lukasz Rogal⁶, Gerhard Wilde¹, Grabowski B², and Sergiy V. Divinski¹ — ¹Institute of Materials Physics, University of Muenster, Muenster, Germany — ²Institute of Materials Science, University of Stuttgart, Stuttgart, Germany — ³Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Madras, Chennai, India — ⁴European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland — ⁵Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Essen, Germany — ⁶Institute of metallurgy and Materials Science, Polish Academy of Sciences, Krakow, Poland

Phase stability and tracer diffusion in a hexagonal close-packed (HCP) HfScTiZr multicomponent alloy are investigated. The microstructure stability is examined by an in-depth electron microscopy characterization of samples subjected to prolonged heat treatments. It is found that the alloy decomposes into two HCP phases with similar lattice constants. The DFT calculations confirm the possibility of the phase decomposition. The minor and major phases are observed to be enriched with Ti and Sc, respectively. Self-diffusion is measured using the 44Ti, 46Sc, and 89Zr radioactive isotopes. The phase decomposition is found to influence marginally Zr, but significantly Ti and Sc diffusion. The diffusion properties are analyzed in correlation to the microstructure stability and thermodynamic properties of the alloy.