Irradiation-induced phase transformations in zirconium alloys

L. M. Howe, D. Phillips, Arthur Thompson Motta, P. R. Okamoto

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Ion and electron irradiations were used to follow the irradiation-induced crystalline-to-amorphous transformation in Zr3Fe, ZrFe2, Zr(Cr,Fe)2 and ZrCr2, as well as in Zr(Cr,Fe)2 and Zr2(Ni,Fe) precipitates in Zircaloy-4. 40Ar and 209Bi ion irradiations of Zr3Fe were performed at 35-725 K using ions of energy 15-1500 keV. The effect of the deposited-energy density θv in the collision cascade on the nature of the damaged regions in individual cascades was investigated. The amorphization kinetics of Zr3Fe during in situ electron irradiation were also determined. The electron fluence required for amorphization increased exponentially with temperature, and the critical temperature for amorphization was about 220 K, compared with 575-625 K for ion irradiation. The difference between the heavy ion and electron irradiation results is attributed to the fact that ion irradiation produces displacement cascades, while electron irradiation produces isolated Frenkel pairs. The dependence of the damage production of the incident electron energy was determined for Zr3Fe and the results could be analysed in terms of a composite displacement cross-section dominated at high energies by displacements of Zr and Fe atoms; by displacements of Fe atoms at intermediate energies; and by secondary displacements of lattice atoms by recoil impurities at low energies. An investigation was initiated on ZrFe2, Zr(Cr,Fe)2 and ZrCr2 to study the effect of variation of the stoichiometry and the presence of lattice defects on irradiation-induced amorphization. The irradiation-induced amorphization of the intermetallic precipitates Zr(Cr,Fe)2 and Zr2(Ni,Fe) in Zircaloy-4 was also studied during in situ bombardment by 40Ar ions of energy 350 keV. The amorphization morphology was shown to be homogeneous. These results are discussed in the context of previous experimental results of neutron and electron irradiations, and likely amorphization mechanisms are proposed.

Original languageEnglish (US)
Pages (from-to)411-418
Number of pages8
JournalSurface and Coatings Technology
Volume66
Issue number1-3
DOIs
StatePublished - Jan 1 1994

Fingerprint

zirconium alloys
Zirconium alloys
Amorphization
electron irradiation
ion irradiation
phase transformations
Electron irradiation
Phase transitions
Ion bombardment
Irradiation
irradiation
cascades
precipitates
energy
Atoms
atoms
Precipitates
neutron irradiation
Ions
Heavy Ions

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Howe, L. M. ; Phillips, D. ; Motta, Arthur Thompson ; Okamoto, P. R. / Irradiation-induced phase transformations in zirconium alloys. In: Surface and Coatings Technology. 1994 ; Vol. 66, No. 1-3. pp. 411-418.
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Irradiation-induced phase transformations in zirconium alloys. / Howe, L. M.; Phillips, D.; Motta, Arthur Thompson; Okamoto, P. R.

In: Surface and Coatings Technology, Vol. 66, No. 1-3, 01.01.1994, p. 411-418.

Research output: Contribution to journalArticle

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