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.
|Number of pages||5|
|Early online date||21 Dec 2018|
|Publication status||Published - 15 Mar 2019|
- mechanical properties