Effects of V on phase formation and plasticity improvement in Cu-Zr-Al glassy alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • C.N. Kuo
  • X.H. Du
  • Y.C. Chen
  • X.J. Liu
  • T.G. Nieh

Detail(s)

Original languageEnglish
Pages (from-to)245-251
Journal / PublicationMaterials Science and Engineering A
Volume561
Online published10 Nov 2012
Publication statusPublished - 20 Jan 2013
Externally publishedYes

Abstract

Vanadium was alloyed to an amorphous Cu-Zr-Al alloy to induce B2-CuZr phase formation in order to improve plasticity. The vanadium addition was based on the fact that it has a positive heat of mixing with the major constituents in the Cu-Zr-Al alloy, thus could cause liquid phase separation. Microstructural examination showed that V was dissolved in the amorphous matrix and promoted the formation of B2-CuZr precipitates in (Cu47.5Zr47.5Al5)99V1, improving the plasticity by doubling the fracture strain to 9.4%. However, when V content is more than 3at%, brittle intermetallic compound phases (V+Al23V4) form and degrade the plasticity. The role of vanadium on plasticity improvement was discussed in the frame of shear band multiplication, energy dissipation during shear banding, twinning/phase-transformation of the B2-CuZr particles during deformation, and deformation induced B2-CuZr particle coarsening. An energy-balance analysis based on deformation-induced B2 particle coarsening produced an interfacial energy of 0.293J/m2 for the B2 particle-glassy matrix interface. The result appears to indirectly support the previous idea that plasticity in Cu47.5Zr47.5Al5 is caused by dynamic coarsening of the B2-CuZr particles.

Research Area(s)

  • Bulk metallic glass, Compression test, Microstructure

Citation Format(s)

Effects of V on phase formation and plasticity improvement in Cu-Zr-Al glassy alloys. / Kuo, C.N.; Huang, J.C.; Du, X.H. et al.
In: Materials Science and Engineering A, Vol. 561, 20.01.2013, p. 245-251.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review