Nickel alloy and articles

An article comprising:

• a material comprising, in weight percent,
• at least about 40% nickel,
• from about 3% to about 6% titanium,
• from about 4% to about 6% tantalum,
• from about 2% to about 3.5% aluminum,
• from about 11.5% to about 13% chromium,
• from about 16% to about 20% cobalt,
• from about 0.03% to about 0.1% carbon,
• from about 0.02% to about 0.08% zirconium
• from about 1% to about 4% molybdenum,
• from about 0.75% to about 1.25% niobium,
• from about 2% to about 5% tungsten, and
• from about 0.1% to about 0.6% hafnium,
• wherein a weight ratio of titanium to aluminum is in the range from about 1 to about 4;
• wherein the material further comprises
• a plurality of L12-structured ordered gamma-prime phase precipitates distributed within a matrix phase at a concentration of at least 20% by volume, wherein the gamma-prime phase precipitates are less than 1 micrometer in size, and
• a plurality of A3-structured ordered eta phase precipitates distributed within the matrix phase at a concentration in the range from about 3% to about 25% by volume, wherein a solvus temperature of the eta phase is higher than a solvus temperature of the gamma-prime phase,
• wherein the material has a median grain size less than 3 micrometers, and wherein the plurality of eta phase precipitates has a median size less than about five times the grain size of the material.