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

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

External organisations

  • Imperial College London

Abstract

A nickel based superalloy has been designed where the fcc γ Ni matrix is reinforced by two different ordered-fcc intermetallic compounds, γ' L12 Ni3Al and γ00 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 1−1000h 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.

Details

Original languageEnglish
Pages (from-to)472-476
Number of pages5
JournalScripta Materialia
Volume162
Early online date21 Dec 2018
Publication statusPublished - 15 Mar 2019

Keywords

  • Superalloy, Precipitation, Intermetallics, microstructure, mechanical properties