High-temperature alloy and articles made therefrom

An alloy consisting essentially of:

• aluminum, in an amount ranging from about 8 atomic percent to about 20 atomic percent;
• chromium, in an amount ranging from about 10 atomic percent to about 30 atomic percent;
• up to about 45 atomic percent nickel;
• up to about 17 atomic percent ruthenium;
• up to about 1.5 atomic percent zirconium;
• up to about 20 atomic percent palladium;
• up to about 20 atomic percent platinum;
• and
• the balance rhodium, wherein said rhodium is present in an amount of at least about 16 atomic percent;
• wherein a microstructure of said alloy comprises a face-centered-cubic phase and a B2-structured phase, wherein said B2-structured phase is present in said microstructure in an amount ranging from about 15 volume percent to about 40 volume percent, and wherein said microstructure is essentially free of an L12-structured phase at temperatures greater than about 1000° C.

An alloy comprising:

• about 15 atomic percent aluminum;
• chromium, in an amount ranging from about 12 atomic percent to about 16 atomic percent;
• up to about 12 atomic percent ruthenium;
• about 1 atomic percent zirconium;
• and
• the balance comprising rhodium, wherein said rhodium is present in an amount of at least about 16 atomic percent;
• wherein a microstructure of said alloy comprises a face-centered-cubic phase and a B2-structured phase, wherein said B2-structured phase is present in said microstructure in an amount ranging from about 20 volume percent to about 35 volume percent, and wherein said microstructure is essentially free of an L12-structured phase at temperatures greater than about 1000° C.

An alloy comprising:

• about 15 atomic percent aluminum;
• chromium, in an amount ranging from about 18 atomic percent to about 24 atomic percent;
• nickel, in an amount ranging between about 22 atomic percent and about 30 atomic percent;
• ruthenium, in an amount ranging between about 8 atomic percent and about 17 atomic percent;
• and
• the balance comprising rhodium, wherein said rhodium is present in an amount of at least about 16 atomic percent;
• wherein a microstructure of said alloy comprises a face-centered-cubic phase and a B2-structured phase, wherein said B2-structured phase is present in said microstructure in an amount ranging from about 20 volume percent to about 35 volume percent, and wherein said microstructure is essentially free of an L12-structured phase at temperatures greater than about 1000° C.

An alloy comprising:

• about 15 atomic percent aluminum;
• chromium, in an amount ranging from about 18 atomic percent to about 28 atomic percent;
• nickel, in an amount ranging between about 30 atomic percent and about 45 atomic percent;
• ruthenium, in an amount ranging between about 6 atomic percent and about 10 atomic percent;
• and
• the balance comprising rhodium, wherein said rhodium is present in an amount of at least about 16 atomic percent;
• wherein a microstructure of said alloy comprises a face-centered-cubic phase and a B2-structured phase, wherein said B2-structured phase is present in said microstructure in an amount ranging from about 20 volume percent to about 35 volume percent, and wherein said microstructure is essentially free of an L12-structured phase at temperatures greater than about 1000° C.

A gas turbine engine component comprising:

• an alloy comprising rhodium, aluminum, and chromium, wherein a microstructure of said alloy of said engine component comprises a face-centered-cubic phase and a B2-structured phase and is essentially free of an L12-structured phase at temperatures greater than about 1000° C.,
• wherein said aluminum is present in an amount ranging from about 8 atomic percent to about 20 atomic percent,
• wherein said chromium is present in an amount ranging from about 10 atomic percent to about 30 atomic percent, and
• wherein the balance comprises rhodium, wherein said rhodium is present in an amount of at least about 16 atomic percent.

A gas turbine engine component comprising:

• an alloy comprising
• about 15 atomic percent aluminum,
• chromium, in an amount ranging from about 12 atomic percent to about 16 atomic percent,
• up to about 12 atomic percent ruthenium,
• about 1 atomic percent zirconium, and
• the balance comprising rhodium, wherein said rhodium is present in an amount of at least about 16 atomic percent;
• wherein a microstructure of said alloy of said gas turbine engine component comprises a face-centered-cubic phase and a B2-structured phase, wherein said B2-structured phase is present in said microstructure in an amount ranging from about 20 volume percent to about 35 volume percent, and wherein said microstructure is essentially free of an L12-structured phase at temperatures greater than about 1000° C.

A gas turbine engine component comprising:

• an alloy comprising
• about 15 atomic percent aluminum,
• chromium, in an amount ranging from about 18 atomic percent to about 24 atomic percent,
• nickel, in an amount ranging between about 22 atomic percent and about 30 atomic percent,
• ruthenium, in an amount ranging between about 8 atomic percent and about 17 atomic percent, and
• the balance comprising rhodium, wherein said rhodium is present in an amount of at least about 16 atomic percent;
• wherein a microstructure of said alloy of said gas turbine engine component comprises a face-centered-cubic phase and a B2-structured phase, wherein said B2-structured phase is present in said microstructure in an amount ranging from about 20 volume percent to about 35 volume percent, and wherein said microstructure is essentially free of an L12-structured phase at temperatures greater than about 1000° C.

A gas turbine engine component comprising:

• an alloy comprising
• about 15 atomic percent aluminum,
• chromium, in an amount ranging from about 18 atomic percent to about 28 atomic percent,
• nickel, in an amount ranging between about 30 atomic percent and about 45 atomic percent,
• ruthenium, in an amount ranging between about 6 atomic percent and about 10 atomic percent, and
• the balance comprising rhodium, wherein said rhodium is present in an amount of at least about 16 atomic percent;
• wherein a microstructure of said alloy of said gas turbine engine component comprises a face-centered-cubic phase and a B2-structured phase, wherein said B2-structured phase is present in said microstructure in an amount ranging from about 20 volume percent to about 35 volume percent, and wherein said microstructure is essentially free of an L12-structured phase at temperatures greater than about 1000° C.