An alloy designed for use in gas turbine engines which has high strength and a low coefficient of thermal expansion is disclosed. The alloy may contain in weight percent 7% to 9% chromium, 21% to 24% molybdenum, greater than 5% tungsten, up to 3% iron, with a balance being nickel and impurities. The alloy must further satisfy the following compositional relationship: 31.95 < R < 33.45, where the R value is defined by the equation: R = 2.66A1 + 0.19Co + 0.84Cr - 0.16Cu + 0.39Fe + 0.60Mn + Mo + 0.69Nb + 2.16Si + 0.47Ta + 1.36Ti + 1.07V + 0.40W The alloy has better hardness after being age-hardened at 760C (1400F) if tungsten is present from greater than 5% up to 10% and a preferred density if the alloy contains greater than 5% up to 7% tungsten.
