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Creep deformation of a sixth generation Ni-base single crystal superalloy at 800 °C

Authors
Journal
Materials Science and Engineering A
0921-5093
Publisher
Elsevier
Publication Date
Volume
608
Identifiers
DOI: 10.1016/j.msea.2014.04.069
Keywords
  • Ni-Base Superalloy
  • Sixth Generation
  • Single Crystal
  • Creep Mechanism
  • Stacking Fault Energy

Abstract

Abstract The interrupted creep tests (ε=0.1%) of a fourth and a sixth generation Ni-base single crystals, i.e. MX-4/PWA 1497 and TMS-238, were conducted at 800°C and 735MPa along [001]. TMS-238 had a creep time more than sixty times longer than MX-4/PWA 1497. Microstructural observations showed that stacking faults (SFs) sheared both the γ matrix and γ΄ precipitates in MX-4/PWA 1497, however, SFs sheared only the γ matrix in TMS-238. The factors that affect the creep deformation are discussed. The results imply that the stacking fault energy (SFE) of γ matrix in TMS-238 is lower than that in MX-4. Higher additions of Re and Ru are responsible for the lower SFE in TMS-238.

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