Solid Solution Strengthening of Mo, Re, Ta and W in Ni during High-Temperature Creep

Solid solution strengthening of the unordered γ matrix phase by alloying elements is great importance during creep Ni-based superalloys, particularly at high temperatures above 1000 °C. To study role different potent solutes, we have conducted experiments on binary Ni-2X alloys (X = Mo, Re, Ta, W) °C, 1050 and 1100 °C a constant stress 20 MPa. Compared to mechanical tests below 800 where size mostly determines solid hardening contribution, contribution directly correlates with their diffusivity. Therefore, such as Ta that lead strong low become less effective higher are exceeded slower diffusing elements, Re.