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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.50  No.8 (2009)  >  pp.2079-2086

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Tailoring Thermally Induced Nano-Quasicrystallization and Deformation-Assisted Nanocrystallization for Mechanical Property Improvement in Zr-Al-Ni-Cu-Pd Bulk Metallic Glasses

Junji Saida1), Albertus D. Setyawan1), Hidemi Kato2), Mitsuhide Matsushita3) and Akihisa Inoue4)
1) Center for Interdisciplinary Research, Tohoku University
2) Institute for Materials Research, Tohoku University
3) Advanced Technology Division, JEOL Ltd.
4) WPI-Advanced Institute for Materials Research, Tohoku University

The material design tailoring of a synergistic effect of an in-situ nano secondary phase formation and deformation-induced nanocrystallization for improving the mechanical strength and ductility, has been investigated in Zr65Al7.5Ni10Cu17.5−xPdx bulk metallic glasses (BMGs). As-cast Zr65Al7.5Ni10Cu17.5−xPdx (x=5–17.5) BMGs have significant ductility in compressive deformation, which is attributed to deformation-induced dynamic nanocrystallization. The 10 at% Pd-containing BMG with a low volume fraction of the quasicrystalline (QC) phase of less than 6% exhibits increases in strength and Young’s modulus, in addition to a remaining plasticity of ∼5%, compared with the monolithic glassy alloy. Such improvements in the mechanical properties originate from the combination of two effects of in-situ homogeneous nano-QC formation and deformation-induced inhomogeneous nanocrystallization. The present method should be regarded as a new technique for the production of BMGs with high strength and good ductility.

metallic glasses, nanostructure, quasicrystals, nanocomposite, ductility, deformation-induced nanocrystallization

Received: April 14, 2009
Accepted: May 21, 2009 , Published online: July 25, 2009
Copyright (c) 2009 The Japan Institute of Metals



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