Zirconium based bulk metallic glasses

1. A metallic glass composition comprising zirconium (Zr), copper (Cu), aluminum (Al), at least one element from a group consisting of niobium (Nb) and titanium (Ti), and at least one element from a group consisting of nickel (Ni), iron (Fe), and cobalt (Co), wherein a concentration of the zirconium is from about 40 to about 56 atomic percent, and wherein a concentration of the copper is from about 30 to about 50 atomic percent, and wherein the metallic glass composition has a formula of Zr a (Nb,Ti) b Cu c (Ni,Fe,Co) d Al e , and further wherein a ratio of e/b is about 1 to about 3 or about 1.5 to about 2.5.

2. The metallic glass composition of claim 1 wherein,

a is from about 36 to about 54;

b is from about 0 to about 10;

c is from about 30 to about 50;

d is from about 0 to about 20; and

e is from about 0 to about 15.

3. The metallic glass composition of claim 1 wherein,

a is from about 40 to about 52;

b is from about 0 to about 8;

c is from about 30 to about 45;

d is from about 0 to about 12; and

e is from about 4 to about 12.

4. The metallic glass composition of claim 1 wherein,

a+b is from about 45 to about 55; and

d+e is from about 5 to about 20.

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

6. An article formed from a metallic glass composition comprising zirconium (Zr), copper (Cu), aluminum, at least one element from a group consisting of niobium (Nb) or titanium (Ti), and at least one element from a group consisting of nickel (Ni), iron (Fe), or cobalt (Co), wherein a concentration of the zirconium is from about 40 to about 56 atomic percent, and wherein a concentration of the copper is from about 30 to about 50 atomic percent, and wherein the metallic glass composition has a formula of Zr a (Nb,Ti) b Cu c (Ni,Fe,Co) d Al e , and further wherein a ratio of e/b is about 1 to about 3.

7. The article of claim 6 wherein the metallic glass composition comprises from about 200 ppm to about 2,000 ppm oxygen.

8. The article of claim 6 wherein,

a is from about 36 to about 54;

b is from about 0 to about 10;

c is from about 30 to about 50;

d is from about 0 to about 20; and

e is from about 0 to about 15.

9. The article of claim 8 wherein the metallic glass composition comprises from about 400 ppm to about 1,000 ppm oxygen.

10. The article of claim 6 wherein,

a+b is from about 45 to about 55; and

d+e is from about 5 to about 20.

11. The article of claim 6 wherein the ratio of e/b is about 1.5 to about 2.5.

12. An article of zirconium based bulk metallic glass having zirconium (Zr), copper (Cu), aluminum (Al), at least one element from a group consisting of niobium (Nb), titanium (Ti), tantalum (Ta), vanadium (V), molybdenum (Mo), chromium (Cr), hafnium (Hf), and yttrium (Y), and at least one element from a group consisting of nickel (Ni), iron (Fe), or cobalt (Co), wherein the article has a substantially fully amorphous phase in an outer portion of a cross-section of the article and a mixture of (i) a crystalline intermetallic body centered cubic phase and (ii) a glassy phase in an inner portion of the cross-section of the article.

13. The article of claim 12 wherein the zirconium based bulk metallic glass has a formula of ZraETMbCucLTMdAle, where ETM is the group consisting of niobium (Nb), titanium (Ti), tantalum (Ta), vanadium (V), molybdenum (Mo), chromium (Cr), hafnium (Hf), and yttrium (Y), and LTM is the group consisting of nickel (Ni), iron (Fe), or cobalt (Co), and wherein a+b is from about 47 to about 54.

14. The article of claim 12 wherein the zirconium based bulk metallic glass has a formula of ZraETMbCucLTMdAle, where ETM is the group consisting of niobium (Nb), titanium (Ti), tantalum (Ta), vanadium (V), molybdenum (Mo), chromium (Cr), hafnium (Hf), and yttrium (Y), and LTM is the group consisting of nickel (Ni), iron (Fe), or cobalt (Co), and wherein a+b is from about 48 to about 52.

15. The article of claim 12 wherein the zirconium based bulk metallic glass has a formula of ZraETMbCucLTMdAle, where ETM is the group consisting of niobium (Nb), titanium (Ti), tantalum (Ta), vanadium (V), molybdenum (Mo), chromium (Cr), hafnium (Hf), and yttrium (Y), and LTM is the group consisting of nickel (Ni), iron (Fe), or cobalt (Co), and wherein a+b is from about 50 to about 51.

16. The article of claim 12 wherein the zirconium based bulk metallic glass has a formula of ZraETMbCucLTMdAle, where ETM is the group consisting of niobium (Nb), titanium (Ti), tantalum (Ta), vanadium (V), molybdenum (Mo), chromium (Cr), hafnium (Hf), and yttrium (Y), and LTM is the group consisting of nickel (Ni), iron (Fe), or cobalt (Co), and wherein a+b is about 50 and c+d+e is about 50.

17. A cast article of Zr-based bulk metallic glass comprising a substantially fully amorphous phase in an outer portion of a cross-section of the cast article and a mixture of (i) a crystalline intermetallic body centered cubic phase having an approximate formula of (Zr, ETM)50(Cu, LTM, Al)50 and (ii) a glassy phase in an inner portion of the cross-section of the cast article, where ETM is the group consisting of niobium (Nb), titanium (Ti), tantalum (Ta), vanadium (V), molybdenum (Mo), chromium (Cr), hafnium (Hf), and yttrium (Y), and LTM is the group consisting of nickel (Ni), iron (Fe), or cobalt (Co).

18. The cast-article of claim 17 wherein cast article further comprises from about 200 ppm to about 2,000 ppm oxygen.

19. The cast article of claim 17 wherein the cast article has a section thickness of at least 10 mm.

20. The cast-article of claim 17 wherein the alloy comprises from about 400 ppm to about 1,000 ppm oxygen, and wherein the cast article has a section thickness of at least about 10 mm.

21. The cast article of claim 17 wherein the amorphous phase of the cast article has an elastic strain limit of at least about 1.5%, and wherein the crystalline intermetallic body centered cubic phase has an elastic strain limit of at least about 0.5%.