Yttrium modified amorphous alloy
View Patent ↗An amorphous alloy having a composition consisting essentially of about 45 to about 65 atomic % Zr and/or Hf, about 4 to about 7.5 atomic % Ti and/or Nb, about 5 to about 15 atomic % Al and/or Zn, and the balance comprising a metal selected from the group consisting of Cu, Co, Ni, up to about 10 atomic % Fe, and Y intentionally present in the alloy composition in an amount not exceeding about 0.5 atomic %, such as about 0.2 to about 0.4 atomic % Y, with an alloy bulk oxygen concentration of at least about 1000 ppm on atomic basis.
1. An amorphous alloy having a composition consisting essentially of about 45 to about 65 atomic % of one or both of Zr and Hf, about 4 to about 7.5 atomic % of one or both of Ti and Nb, about 5 to about 15 atomic % of one or both of Al and Zn, and the balance including a metal selected from the group consisting of Cu, Co, Ni, and up to about 10 atomic % Fe, and Y in an amount exceeding zero and not exceeding about 0.5 atomic %.
2. The alloy of claim 1 wherein Y is present in an amount from about 0.2 to about 0.4 atomic %.
3. The alloy of claim 1 having a bulk oxygen impurity concentration in the range of about 1000 to about 2000 ppm on an atomic basis.
4. A bulk amorphous cast body having a composition consisting essentially of about 45 to about 65 atomic % of one or both of Zr and Hf, about 4 to about 7.5 atomic of one or both of Ti and Nb, about 5 to about 15 atomic % of one or both of Al and Zn, and the balance including a metal selected from the group consisting of Cu, Co, Ni, and up to about 10 atomic % Fe, a bulk oxygen impurity concentration of at least about 1000 ppm on an atomic basis, and Y in an amount exceeding zero and not exceeding about 0.5 atomic %.
5. The cast body of claim 4 wherein Y is present in an amount from about 0.2 to about 0.4 atomic %.
6. The cast body of claim 4 wherein said bulk oxygen impurity concentration is in the range of about 1000 to about 2000 ppm on an atomic basis.
7. The cast body of claim 4 which is die cast.
8. A method of making an amorphous alloy casting, providing a molten alloy with a composition consisting essentially of about 45 to about 65 atomic of one or both of Zr and Hf, about 4 to about 7.5 atomic % of one or both of Ti and Nb, about 5 to about 15 atomic % of one or both of Al and Zn, and the balance including a metal selected from the group consisting of Cu, Co, Ni, and up to about 10 atomic % Fe, and Y in an amount exceeding zero and not exceeding about 0.5 atomic %, and casting said alloy in a cavity.
9. The method of claim 8 wherein Y is present in an amount from about 0.2 to about 0.4 atomic %.
10. The method of claim 8 wherein said alloy has a bulk oxygen impurity concentration in the range of about 1000 to about 2000 ppm on an atomic basis after said casting.
11. The method of claim 8 wherein said alloy is die cast in said cavity.