TY - JOUR A1 - Epishin, A. A1 - Link, T. A1 - Svetlov, I. L. A1 - Nolze, Gert A1 - Saliwan Neumann, Romeo A1 - Lucas, H. T1 - Mechanism of porosity growth during homogenisation in single crystal nickel-based superalloys T2 - International Journal of Materials Research N2 - Several mechanisms for porosity growth in single crystal nickel-based superalloys during homogenisation heat treatment have been proposed in the literature. They were carefully checked using different experimental methods, namely quantitative light microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and density measurements. It is shown that the main mechanism is the Kirkendall–Frenkel effect, i.e. generation of voids due to uncompensated efflux of Al atoms from dissolving γ/γ′-eutectic areas. The Al diffusion is supported by the afflux of vacancies from surrounding γ-matrix which results in porosity growth. This conclusion is confirmed by the estimation of the vacancy afflux towards the dissolving eutectic. PB - Carl Hanser Verlag KW - Ni-base superalloy KW - Eutectic KW - Vacancies KW - Porosity PY - 2013 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/37983 AN - OPUS4-37983 VL - 104 IS - 8 SP - 776 EP - 782 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany