Residual stress reduction for air plasma sprayed Al-Si abradable coating

J. R. Tucker, B. Abbott, K. Sivaramakrishnan, Terry Alford

Research output: Chapter in Book/Report/Conference proceedingConference contribution


During the air plasma spray process large residual stresses form making the coating prone to delamination. Therefore, it is important to elucidate the mechanisms responsible for the high residual stresses. To determine an effective method to reduce the residual stresses present in the coating, heat treatments have been preformed to better understand the effects that a post-deposition heat treatment has on the microstructure and subsequent stress levels in the abradable coating. The microstructure and stress analyses techniques include x-ray diffraction, energy dispersive x-ray spectroscopy, and secondary electron microscopy. It was found, after analysis of the microstructure and residual stresses, that factors effecting the relief of stresses in the coating include a decrease of Si in solution and the formation of Si precipitates.

Original languageEnglish (US)
Title of host publicationTMS 2009 - 138th Annual Meeting and Exhibition - Supplemental Proceedings
Number of pages7
StatePublished - Oct 1 2009
EventTMS 2009 - 138th Annual Meeting and Exhibition - San Francisco, CA, United States
Duration: Feb 15 2009Feb 19 2009

Publication series

NameTMS Annual Meeting


ConferenceTMS 2009 - 138th Annual Meeting and Exhibition
Country/TerritoryUnited States
CitySan Francisco, CA


  • Abradable coatings
  • Al-Si
  • Plasma spray

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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