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Lecture

Towards Operational Temperatures: Nanoindentation of CMSX-4 and an Amdry-386 Bondcoat to 1000?C

Tuesday (27.09.2016)
17:30 - 17:45
Part of:


With nickel-based superalloys reaching their limit in high-temperature gas turbines, further refinement and new alloys are required with improved mechanical properties. Small-scale mechanical testing – particularly nanoindentation – is of great benefit to alloy development, allowing hardness to be measured on small volumes of newly-developed materials.


In this work, we present high-temperature nanoindentation results on CMSX-4 and an Amdry-386 bondcoat up to 1000?C. We measure a room-temperature hardness of 4 GPa and modulus of 110 GPa, matching well with literature values. A peak hardness of 5.5 GPa is seen at 400?C, after which the hardness rapidly falls to 0.5 GPa at 1000?C. The Amdry-386 bondcoat matches this behavior closely. This behavior is explained with regards to the deformation processes in L12 crystal structures and the stress states during nanoindentation.


A discussion of the issues encountered during nanoindentation at extreme temperatures is also presented.

 

Speaker:
Dr. James Gibson
RWTH Aachen University
Additional Authors:
  • Sebastian Schröders
    RWTH Aachen University
  • Christoffer Zehnder
    RWTH Aachen University
  • Prof. Dr. Sandra Korte-Kerzel
    RWTH Aachen University