Zirconium based bulk metallic glasses with hafnium

1. A metallic glass composition comprising zirconium (Zr), hafnium (Hf), copper (Cu), aluminum (Al), at least one element from a group consisting of niobium (Nb) and titanium (Ti), and iron (Fe), wherein a concentration of the zirconium is from about 25 to about 65 atomic percent, and wherein a concentration of the hafnium is from about 5 to about 25 atomic percent, and wherein the metallic glass composition substantially does not include nickel (Ni).

2. The metallic glass composition of claim 1 wherein the metallic glass composition has a formula of Zr a Hf b (Nb,Ti) c Cud(Fe) e Al f , and wherein,

a is from about 35 to about 60;

b is from about 8 to about 20;

c is from about 0 to about 8;

d is from about 0 to about 40;

e is from about 0 to about 30; and

f is from about 5 to about 25.

3. The metallic glass composition of claim 1 wherein the metallic glass composition has a formula of Zr a Hf b (Nb,Ti) c Cud(Fe) e Al f , and wherein,

a is from about 40 to about 60;

b is from about 8 to about 16;

c is from about 0 to about 6;

d is from about 0 to about 40;

e is from about 0 to about 20; and

f is from about 7 to about 15.

4. The metallic glass composition of claim 1 wherein the metallic glass composition has a formula of Zr a Hf b (Nb,Ti) c Cud(Fe) e Al f , and wherein,

a is from about 45 to about 55;

b is from about 8 to about 14;

c is from about 2 to about 5;

d is from about 0 to about 35;

e is from about 0 to about 20; and

f is from about 8 to about 11.

5. The metallic glass composition of claim 1 wherein the metallic glass composition has a formula of Zr a Hf b (Nb,Ti) c Cud(Fee) e Al f , and wherein,

a+b is from about 40 to about 55; and

d+e is from about 20 to about 50.

6. The metallic glass composition of claim 1 wherein the metallic glass composition has a formula of Zr a Hf b (Nb,Ti) c Cud(Fe) e Al f , and wherein,

a+b is from about 55 to about 70; and

d+e is from about 10 to about 40.

7. The metallic glass composition of claim 1 wherein the metallic glass composition has a formula of Zr 50 Hf 10 Nb 3 Cu 22 Fe 5 Al 10 .

8. The metallic glass composition of claim 1 wherein the metallic glass composition further includes at least one of tantalum (Ta), vanadium (V), beryllium (Be), palladium (Pd), or silver (Ag), and at least one of yttrium (Y), silicon (Si), or scandium (Sc).

9. An article formed from a metallic glass composition comprising zirconium (Zr) and hafnium (Hf), wherein a concentration of the zirconium is from about 25 to about 65 atomic percent, and wherein a concentration of the hafnium is from about 5 to about 25 atomic percent, and further wherein the metallic glass composition substantially does not include nickel (Ni).

10. The article of claim 9 wherein the metallic glass composition further includes copper (Cu), aluminum (Al), iron (Fe), and at least one element from a group consisting of niobium (Nb) and titanium (Ti).

11. The article of claim 10 wherein a ratio of Hf/(Ti+Nb) is in the range of from about 2 to about 5.

12. The article of claim 10 wherein the metallic glass composition substantially does not include Ni or Co.

13. The article of claim 10 wherein a density of the article is about 7.0 to about 8.5 grams per center meter cubed.

14. The article of claim 10 wherein a yield strength of the article is about 1.4 GPa to about 2.2 GPa.

15. The article of claim 10 wherein section thickness of the article is about 5 mm to about 30 mm.

16. The article of claim 10 wherein a bend ductility of the article is about 4% with a smallest section thickness being about 2 mm.

17. A metallic glass composition, comprising:

zirconium (Zr);

hafnium (Hf);

copper (Cu);

aluminum (Al);

at least one element from a group consisting of niobium (Nb) and titanium (Ti);

iron (Fe);

at least one element from a group consisting of tantalum (Ta), vanadium (V), beryllium (Be), palladium (Pd), and silver (Ag);

at least one element from a group consisting of yttrium (Y), silicon (Si), and scandium (Sc); and

wherein a concentration of the zirconium is from about 25 to about 65 atomic percent, and wherein a concentration of the hafnium is from about 5 to about 25 atomic percent, and wherein the metallic glass composition substantially does not include nickel (Ni) or cobalt (Co).

18. The metallic glass composition of claim 17 wherein the metallic glass composition has a formula of Zr a Hf b (Nb,Ti) c Cu d (Fe) e Al f PPP g QQQ h where PPP is the at least one element from a group consisting of tantalum (Ta), vanadium (V), beryllium (Be), palladium (Pd), and silver (Ag) and QQQ is the at least one element from a group consisting of yttrium (Y), silicon (Si), and scandium (Sc), and wherein

a+b is about 45 to about 70;

d+e is about 10 to about 50; and

g+h is about 0 to about 5.

19. The metallic glass composition of claim 17 wherein the metallic glass composition has a formula of Zr a Hf b (Nb,Ti) c Cu d (Fe) e Al f PPP g QQQ h where PPP is the at least one element from a group consisting of tantalum (Ta), vanadium (V), beryllium (Be), palladium (Pd), and silver (Ag) and QQQ is the at least one element from a group consisting of yttrium (Y), silicon (Si), and scandium (Sc), and wherein

a+b+c is about 45 to about 70;

d+e is about 20 to about 45; and

g+h is about 0 to about 2.