Microstructural comparison of Zr73.5Nb9Cu7Ni1Al9.5 nanostructure-dendrite composites produced by different casting techniques

K. B. Kim, J. Das, W. Löser, M. H. Lee, D. H. Kim, S. K. Roy, J. Eckert

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Zr73.5Nb9Cu7Ni1Al9.5 (numbers indicate at.%) nanostructure-dendrite composites were fabricated using three different casting techniques: suction casting, centrifugal casting and arc-melting. The microstructure of the suction casting sample consists of micrometer-scale dendrites in a nanostructured matrix. However, some areas in the matrix contain nano-scale crystals together with an amorphous phase revealing an inhomogeneity of the specimen. On the contrary, the microstructures of the centrifugally-cast and the arc-melted samples are overall homogeneous, consisting of micrometer-scale dendrites that are homogeneously distributed in a nanostructured matrix. The dendrites correspond to a body centered cubic (bcc) β-Zr phase, whereas the nanostructured matrix consists of body centered tetragonal (bct) Zr2Cu-type and hexagonal close-packed (hcp) MgZn2-type phases. The comparison of the microstructures of these two alloys reveals that the formation of nano-scale twins and a disordered ω-phase in the β-Zr dendrites only happens in the centrifugally-cast sample. The differences in the phases and the microstructures between the differently prepared samples significantly influence the corresponding mechanical properties of the specimens.

Original languageEnglish
Pages (from-to)747-751
Number of pages5
JournalMaterials Science and Engineering A
Volume449-451
DOIs
Publication statusPublished - 2007 Mar 25

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dendrites
Nanostructures
Casting
Microstructure
composite materials
Composite materials
microstructure
suction
matrices
Centrifugal casting
micrometers
casts
centrifugal casting
arc melting
Melting
inhomogeneity
Mechanical properties
arcs
Crystals
mechanical properties

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Kim, K. B. ; Das, J. ; Löser, W. ; Lee, M. H. ; Kim, D. H. ; Roy, S. K. ; Eckert, J. / Microstructural comparison of Zr73.5Nb9Cu7Ni1Al9.5 nanostructure-dendrite composites produced by different casting techniques. In: Materials Science and Engineering A. 2007 ; Vol. 449-451. pp. 747-751.
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Microstructural comparison of Zr73.5Nb9Cu7Ni1Al9.5 nanostructure-dendrite composites produced by different casting techniques. / Kim, K. B.; Das, J.; Löser, W.; Lee, M. H.; Kim, D. H.; Roy, S. K.; Eckert, J.

In: Materials Science and Engineering A, Vol. 449-451, 25.03.2007, p. 747-751.

Research output: Contribution to journalArticle

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