A nickel based superalloy reinforced by both Ni3Al and Ni3V ordered-fcc precipitates

Alexander J Knowles, Lucy Reynolds, Vassili A Vorontsov, David Dye

Research output: Contribution to journalArticle

5 Citations (Scopus)
5 Downloads (Pure)

Abstract

A nickel based superalloy has been designed where the fcc γ Ni matrix is reinforced by two different ordered-fcc intermetallic compounds, γ' L1Ni3Al and γ'' D022 Ni3V. Primary ageing at 900–1000 °C precipitated spherical L12 Ni3Al, whose volume fraction and size were controlled by altering the ageing temperature and time. Secondary ageing at 700 °C for 1–1000 h precipitated D022 Ni3V laths. The duplex precipitation increased hardness by up to 85 HV, with ∼ 500 MPa compressive proof strength maintained at 800 °C. Electron microscopy studied the Ni3Al precipitation and confirmed the form of the secondary Ni3V precipitates and their long term stability.
Original languageEnglish
Pages (from-to)472-476
Number of pages5
JournalScripta Materialia
Volume162
Early online date21 Dec 2018
DOIs
Publication statusPublished - 15 Mar 2019

Keywords

  • superalloy
  • precipitation
  • intermetallics
  • microstructure
  • mechanical properties

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