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Reynolds, Lucy
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article
A nickel based superalloy reinforced by both Ni3Al and Ni3V ordered-fcc precipitates
Abstract
A nickel based superalloy has been designed where the fcc γ Ni matrix is reinforced by two different ordered-fcc intermetallic compounds, γ' L1<sub>2 </sub>Ni<sub>3</sub>Al and γ'' D0<sub>22</sub> Ni<sub>3</sub>V. Primary ageing at 900–1000 °C precipitated spherical L1<sub>2</sub> Ni<sub>3</sub>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 D0<sub>22</sub> Ni<sub>3</sub>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 Ni<sub>3</sub>Al precipitation and confirmed the form of the secondary Ni<sub>3</sub>V precipitates and their long term stability.