Determination of orientation and alloying effects on creep response and deformation mechanisms in single crystals of Ni-base disk superalloys

T. M. Smith, L. V. Duchao, T. Hanlon, A. Wessman, Y. Wang, M. J. Mills

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

5 Scopus citations

Abstract

In this study, the effects of varying crystal orientation and composition on active deformation modes are explored for two different Ni-base disk alloys. Understanding these effects will allow for improved predictive modeling and consequently faster advancements in Ni-base alloy development. In order to investigate these effects, compression creep tests were conducted on [001] and [110] oriented single crystal specimens of the disk alloys ME3 and ME501, at different stress/temperature regimes. At 760 °C and below, a prominent creep anisotropy exists between the two orientations, with the [110] oriented samples exhibiting superior creep strength. At 815 °C, the creep anisotropy disappeared between the two orientations. Through bright field scanning transmission electron microscopy, it was determined that the existence of creep anisotropy is a result of differences in deformation modes between the different orientations and alloy compositions. Results of phase field modeling in which the interaction of dislocations with realistic precipitate structures is also conducted to further advance predictive creep deformation models.

Original languageEnglish (US)
Title of host publicationSUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys
EditorsMark Hardy, Eric Huron, Uwe Glatzel, Brian Griffin, Beth Lewis, Cathie Rae, Venkat Seetharaman, Sammy Tin
PublisherMinerals, Metals and Materials Society
Pages579-588
Number of pages10
ISBN (Electronic)9781118996669
DOIs
StatePublished - 2016
Externally publishedYes
Event13th International Symposium on Superalloys, SUPERALLOYS 2016 - Seven Springs, United States
Duration: Sep 11 2016Sep 15 2016

Publication series

NameProceedings of the International Symposium on Superalloys
Volume2016-January

Conference

Conference13th International Symposium on Superalloys, SUPERALLOYS 2016
Country/TerritoryUnited States
CitySeven Springs
Period9/11/169/15/16

Keywords

  • Compression creep
  • Deformation mechanisms
  • Dislocation activity diagram
  • Ni-based Superalloy
  • STEM

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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