Formation, thermal and mechanical properties of bulk glassy alloys in Zr–Al–Co and Zr–Al–Co–Cu systems

✍ Scribed by Tao Zhang; Akihisa Inoue

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 99 KB
• Volume: 375-377
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2003.10.233

✦ Synopsis

New Zr-based bulk glassy alloys in Zr-Al-Co and Zr-Al-Co-Cu systems were developed. The largest supercooled liquid region is upto 64 K for the Zr 55 Al 20 Co 25 alloy and 80 K for the Zr 55 Al 20 Co 20 Cu 5 alloy, respectively. Glassy rods with a diameter of 3 mm for the Zr 55 Al 20 Co 25 alloy and 5 mm for the Zr 55 Al 20 Co 20 Cu 5 alloy can be prepared by copper-mold casting . Glassy Zr 55 Al 20 Co 20 Cu 5 sheet with a thickness of 2 mm was also formed by squeeze copper-mold casting. The bulk glassy Zr 55 Al 20 Co 20 Cu 5 alloy exhibits Young's modulus of 92 GPa, elastic limit of 2.1%, tensile strength of 1960 MPa, compressive fracture strength of 2200 MPa, and compressive plastic strain of 0.6%. The tensile strength value is considerably higher than those for the other Zr-based bulk glassy alloys reported upto date. The synthesis of the new Zr-based bulk glassy alloys with high glass-forming ability and high tensile strength approaching 2000 MPa is expected to result in a future extension of application fields as a high strength material.