Superalloy compositions, articles, and methods of manufacture

1. A composition of matter, comprising in combination, in atomic percent contents:

a content of nickel as a largest content;

19.0-21.0 percent cobalt;

9.0-11.4 percent chromium;

1.4-3.0 percent tantalum;

0.9-1.5 percent tungsten;

7.0-9.5 percent aluminum;

0.10-0.25 percent boron;

0.09-0.20 percent carbon;

1.5-2.0 percent molybdenum;

1.1-1.5 percent niobium;

3.0-3.6 percent titanium; and

0.02-0.09 percent zirconium.

2. The composition of claim 1 in powder form.

3. A gas turbine engine turbine or compressor disk having the composition of claim 1 .

4. The composition of claim 1 wherein said respective contents are:

20.3-20.9 percent cobalt;

9.4-11.3 percent chromium;

1.8-2.5 percent tantalum;

0.9-1.0 percent tungsten;

7.9-9.2 percent aluminum;

0.15-0.23 percent boron;

0.09-0.16 percent carbon;

1.74-1.95 percent molybdenum;

1.20-1.26 percent niobium;

4.25-3.45 percent titanium; and

0.03-0.06 percent zirconium.

5. The composition of claim 1 consisting essentially of said combination.

6. The composition of claim 1 comprising no more than 0.50 weight percent hafnium.

7. The composition of claim 1 comprising no more than 0.05 weight percent hafnium.

8. The composition of claim 1 wherein:

said content of nickel is at least 50 weight percent.

9. The composition of claim 1 wherein:

said content of nickel is 43-57 weight percent.

10. The composition of claim 1 wherein:

said content of nickel is 48-52 weight percent.

11. The composition of claim 1 having:

a value Ta above 1.45 using atomic percent.

12. The composition of claim 1 having:

a value (Cr/(Al*Ta)) below 1.0 using atomic percent.

13. The composition of claim 1 having:

a value (Cr/(Al*Ta)) below 0.53 using atomic percent.

14. The composition of claim 1 having:

a value ((Cr/Al) 2 ) less than 2.15 using atomic percent.

15. The composition of claim 1 wherein said respective contents are:

20.1-21.0 percent cobalt;

9.2-11.4 percent chromium;

1.4-2.5 percent tantalum;

0.94-1.3 percent tungsten;

7.1-9.2 percent aluminum;

0.14-0.24 percent boron;

0.09-0.20 percent carbon;

1.7-2.0 percent molybdenum;

1.15-1.30 percent niobium;

3.20-3.50 percent titanium; and

0.03-0.07 percent zirconium.

16. The composition of claim 15 having:

a value (Ta/Cr) 2 above 0.022 using atomic percent.

17. The composition of claim 15 having:

a value (1/(Al*Cr)) above 0.011 using atomic percent.

18. The composition of claim 15 having:

a value (Cr*Ta) above 17.5 using atomic percent.

19. The composition of claim 15 having:

a value (Cr/Ta) below 7.21 using atomic percent.

20. The composition of claim 15 having:

a value ((Al*Ta)/Cr) above 1.15 using atomic percent.

21. The composition of claim 15 having:

a value Ta above 1.67 using atomic percent.

22. The composition of claim 1 further comprising:

no more than 1.0 weight percent, individually, of every additional constituent, if any.

23. The composition of claim 22 further comprising:

no more than 1.0 weight percent, in total, of all additional constituents, if any.

24. A process for forming an article comprising:

compacting a powder having the composition of claim 1 ;

forging a precursor formed from the compacted powder; and

machining the forged precursor.

25. The process of claim 24 further comprising:

heat treating the precursor, at least one of before and after the machining, by heating to a temperature of no more than 1232° C. (2250° F.).

26. The process of claim 24 further comprising:

heat treating the precursor, at least one of before and after the machining, the heat treating effective to increase a characteristic γ grain size from a first value of about 10 μm or less to a second value of 20-120 μm.