Bulk metallic glass formation in the binary Cu–Zr system

Using the Cu–Zr model system, we demonstrate that bulk amorphous alloys can be obtained by copper mold casting even in a binary metallic system. The narrow, off-eutectic, bulk-glass-forming range was found to require composition pinpointing to <1 at. %. A phase selection diagram is used to explain the success of our microstructure-based approach to pinpoint the best glass former in a given system. The implications of discovering simple binary bulk amorphous alloys are discussed, in terms of its impact on understanding the formation and physics of bulk metallic glasses.

[1]  A. Inoue,et al.  An Amorphous La 55 Al 25 Ni 20 Alloy Prepared by Water Quenching , 1989 .

[2]  B. Kear,et al.  Rapidly Solidified Amorphous and Crystalline Alloys , 1982 .

[3]  W. Johnson,et al.  A highly processable metallic glass: Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 , 1993 .

[4]  A. Inoue,et al.  Amorphous Zr–Al–TM (TM=Co, Ni, Cu) Alloys with Significant Supercooled Liquid Region of Over 100 K , 1991 .

[5]  C. J. Smithells,et al.  Smithells metals reference book , 1949 .

[6]  Yong Zhang,et al.  Optimum glass formation at off-eutectic composition and its relation to skewed eutectic coupled zone in the La based La–Al–(Cu,Ni) pseudo ternary system , 2003 .

[7]  A. Inoue.  Stabilization of metallic supercooled liquid and bulk amorphous alloys , 2000 .

[8]  W. Johnson,et al.  Ni-based bulk metallic glass formation in the Ni–Nb–Sn and Ni–Nb–Sn–X (X=B,Fe,Cu) alloy systems , 2003 .

[9]  Hung Chen.  REVIEW ARTICLE: Glassy metals , 1980 .

[10]  W. Johnson.  Bulk Glass-Forming Metallic Alloys: Science and Technology , 1999 .

[11]  Wei Zhang,et al.  Formation, Thermal Stability and Mechanical Properties of Cu-Zr and Cu-Hf Binary Glassy Alloy Rods , 2004 .

[12]  W. L. Johnson,et al.  A highly processable metallic glass: Zr[sub 41. 2]Ti[sub 13. 8]Cu[sub 12. 5]Ni[sub 10. 0]Be[sub 22. 5] , 1993 .

[13]  D. Turnbull.  Under what conditions can a glass be formed , 1969 .

[14]  Z. Lu,et al.  Glass formation criterion for various glass-forming systems. , 2003, Physical review letters.

[15]  A. L. Greer,et al.  Bulk formation of a metallic glass: Pd40Ni40P20 , 1982 .

[16]  S. Poon,et al.  CaAl-based bulk metallic glasses with high thermal stability , 2004 .