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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.11 (2002)  >  pp.2843-2846

MATERIALS TRANSACTIONS
<<Previous article Vol.43  No.11 (2002)   pp.2843 - 2846 Next article>>

Formation, Thermal Stability and Mechanical Properties in Zr-Al-Co Bulk Glassy Alloys

Takeshi Wada1), Tao Zhang2) and Akihisa Inoue2)
1) Graduate School, Tohoku University
2) Institute for Materials Research, Tohoku University


A Zr–Al–Co ternary alloy was investigated in order to clarify the glass-forming ability, thermal stability and mechanical properties. The Zr55Al20Co25 alloy was found to be fabricated in bulk glassy alloy rods with diameters up to at least 2.5 mm. The glassy alloy rod of 2.5 mm in diameter exhibits a large supercooled liquid region of 79 K, followed by a nearly single exothermic peak due to the precipitation of ZrCo+ZrAlCo+Zr6Al2Co phases. The glassy alloy rod exhibits Young’s modulus of 114 GPa, high compressive fracture strength of 1900 MPa and total fracture elongation of 1.7%. The finding of forming the bulk glassy alloy at the new ternary composition of Zr55Al20Co25 by the copper mold casting method is encouraging for future search of a new glassy alloy composition.


Keyword:
bulk glassy alloy, zirconium-aluminum-cobalt system, casting, supercooled liquid, high mechanical strength

Received: May 15, 2002
Accepted: September 17, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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