Fracture toughness study of new Zr-based Be-bearing bulk metallic glasses

Three new compositional variants of the Zr–Ti–Be–LTM (late transition metal) family of metallic glasses are discussed. Thermal stability, Δ T = T x− T g, was increased from 82 °C for Zr 41.2Ti 13.8Cu 12.5Ni 10Be 22.5 (Viterloy 1) to 141 °C for Zr 44Ti 11Cu 20Be 25. It is found that fracture toughnes...

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Bibliographic Details
Published in:Scripta materialia 2009, Vol.60 (2), p.80-83
Main Authors: Kim, C. Paul, Suh, Jin-Yoo, Wiest, Aaron, Lind, Mary Laura, Conner, R. Dale, Johnson, William L.
Format: Article
Language:English
Subjects:
Alloys
Amorphous materials
Beryllium
Bulk amorphous materials
Fracture
Fracture toughness
Metallic glasses
Toughness
Transition metals
Zirconium
Zirconium base alloys
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Summary:Three new compositional variants of the Zr–Ti–Be–LTM (late transition metal) family of metallic glasses are discussed. Thermal stability, Δ T = T x− T g, was increased from 82 °C for Zr 41.2Ti 13.8Cu 12.5Ni 10Be 22.5 (Viterloy 1) to 141 °C for Zr 44Ti 11Cu 20Be 25. It is found that fracture toughness is the most distinguishing parameter characterizing the alloys in contrast to other mechanical properties. Quaternary alloys consistently had fracture toughness values exceeding 80 MPa m 1/2, while for Vitreloy 1 K Q = 48.5 MPa m 1/2 with a large amount of scatter. Adding iron reduced the fracture toughness to 25 MPa m 1/2.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2008.09.001