Nickel alloy and articles

摘要

Articles suitable for use in high temperature applications, such as turbomachinery components, and methods for making such articles, are provided. One embodiment is an article. The article comprises a material comprising a plurality of L12-structured 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 eta phase precipitates distributed within the matrix phase at a concentration in the range from about 1% to about 25% by volume. The solvus temperature of the eta phase is higher than the solvus temperature of the gamma-prime phase. Moreover, the material has a median grain size less than 10 micrometers.

主权项

1. An article comprising: a material comprising the following elements, in weight percent:
at least about 40% nickel, from about 1.5% to about 8% titanium, and from about 1.5% to about 4.5% aluminum, wherein a weight ratio of titanium to aluminum is in the range from about 1 to about 4, 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 further comprises from about 2% to about 8% tantalum, up to about 7% molybdenum, up to about 2% niobium, and up to about 1% hafnium and wherein the material has a median grain size of less than 3 micrometers.