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Local mechanical properties at the dendrite scale of Ni-Based superalloys studied by advanced high temperature indentation creep and micropillar compression tests

: Haußmann, Lukas; Neumeier, Steffen; Kolb, Markus; Ast, Johannes; Mohanty, Gaurav; Michler, Johann; Göken, Mathias


Tin, Sammy (Ed.):
Superalloys 2020. 14th International Symposium on Superalloys. Proceedings : September 12-16, 2021, Seven Springs, Pennsylvania, USA; rescheduled the 14th International Symposium on Superalloys to September 12-16, 2021
Cham: Springer Nature, 2020 (The minerals, metals & materials series)
ISBN: 978-3-030-51833-2 (Print)
ISBN: 978-3-030-51834-9 (Online)
ISBN: 978-3-030-51835-6
ISBN: 978-3-030-51836-3
International Symposium on Superalloys (Superalloys) <14, 2021, Seven Springs/Pa.>
Deutsche Forschungsgemeinschaft DFG
SFB/TR 103;
From Atoms to Turbine Blades - a Scientific Approach for Developing the Next Generation of SIngle Crystal Superalloys
Conference Paper
Fraunhofer IKTS ()
dendritic segregations; Ni-based superalloys; micropillar compression; indentation creep

Chemical inhomogenities due to dendritic solidification of Ni-based superalloys result in different local microstructures with varying mechanical properties. New indentation creep test methods allow probing of the local creep properties at the dendrite scale at high temperatures. The as-cast single crystalline Ni-based superalloy ERBO1A (a derivative alloy of CMSX–4) was investigated and electron-probe microanalysis (EPMA) measurements revealed strong segregation of, e.g., Re and W in the dendritic region and, e.g., Ta in the interdendritic region. Indentation creep experiments at 750 °C and micropillar compression tests at 785 °C were conducted in both regions, and a higher creep strength was found in the dendritic region compared to the interdendritic region. Theoretical models for solid solution hardening as well as γ′ precipitation hardening confirm these results, since they predict a higher strength in the dendritic region than in the interdendritic region. Compared with the fully heat treated state, a smaller difference in the local mechanical properties or even a reverse strength ratio of the dendritic and interdendritic region can be expected.