A nickel based superalloy reinforced by both Ni3Al and Ni3V ordered-fcc precipitates. (15th March 2019)

• Record Type: Journal Article
• Authors: J Knowles, Alexander; Reynolds, Lucy; A Vorontsov, Vassili; Dye, David
• Is Part Of: Scripta materialia. Number 162(2019)
• Page Start: 472
• Page End: 476
• Publication Date: 2019-03-15
• Subjects: Superalloy -- Precipitation -- Intermetallics -- Microstructure -- Mechanical properties; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.12.013
• Languages: English
• ISSNs: 1359-6462

Abstract

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 Ni3 Al and γ ′ ′ D022 Ni3 V. Primary ageing at 900–1000 °C precipitated spherical L12 Ni3 Al, 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 Ni3 V 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 Ni3 Al precipitation and confirmed the form of the secondary Ni3 V precipitates and their long term stability. Graphical Abstract: