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Acoustic emission (AE) activity was monitored during tentile testing of Ni-base superalloy single crystals, coated with two types of plasma sprayed MCrA1Y overlay coatings. Series of tentile tests were performed for both types of coated systems at four different temperatures (300, 500, 700, and 900 degrees Celsius). The AE data were analysed by means of a standardized k-means algorithm with respect to nine parameters (such as amplitude, numbers of counts, duration, rise time, energy etc). Within the nine-dimensional descriptor subspaces, which characterize two distinct groups of AE events pertaining to different damage mechanisms. In conjunction with in-situ video imaging of the specimen surface and post-mortem micro-structural analysis of the samples, the AE data classification has provided a means for non-destructive damage identification and assessment.

Additional information

Authors: VOUGIOUKLAKIS Y, JRC, IAM, Clean Energies Unit, Petten (NL);HAHNER P, JRC, IAM, Clean Energies Unit, Petten (NL);PETEVES S D, JRC, IAM, Clean Energies Unit, Petten (NL)
Bibliographic Reference: An oral report given at: The 2nd National Conference on Composite Materials. Held in: Patras (GR), 7-9 June 2001
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