Anisotropic grain growth in TiO2-doped alumina

Debra S. Horn, Gary L. Messing

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

Grain growth in TiO2-doped alumina was studied in a high density, ultrafine matrix (0.4 μm. Normal grain growth, anisotropic grain growth and abnormal grain growth were observed. With 0.15-0.4 wt.% TiO2, samples initially undergo normal grain growth until a crystal microstructure is attained and anisotropic grain growth in nucleated. Large anisotropic, platelet-shaped grains grow rapidly by a step growth process until impingement of the large grains essentially stops further growth. The volume fraction of anisotropic grains ranged from 20 to 100 vol.% suggesting that physical properties dependent on grain shape and volume fraction can be tailored. Critical requirements are proposed for the in situ growth of anisotropic grains.

Original languageEnglish (US)
Pages (from-to)169-178
Number of pages10
JournalMaterials Science and Engineering A
Volume195
Issue numberC
DOIs
StatePublished - Jun 1 1995

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Aluminum Oxide
Grain growth
Alumina
aluminum oxides
Volume fraction
Crystal microstructure
Platelets
Physical properties
impingement
platelets
physical properties

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "Grain growth in TiO2-doped alumina was studied in a high density, ultrafine matrix (0.4 μm. Normal grain growth, anisotropic grain growth and abnormal grain growth were observed. With 0.15-0.4 wt.{\%} TiO2, samples initially undergo normal grain growth until a crystal microstructure is attained and anisotropic grain growth in nucleated. Large anisotropic, platelet-shaped grains grow rapidly by a step growth process until impingement of the large grains essentially stops further growth. The volume fraction of anisotropic grains ranged from 20 to 100 vol.{\%} suggesting that physical properties dependent on grain shape and volume fraction can be tailored. Critical requirements are proposed for the in situ growth of anisotropic grains.",
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Anisotropic grain growth in TiO2-doped alumina. / Horn, Debra S.; Messing, Gary L.

In: Materials Science and Engineering A, Vol. 195, No. C, 01.06.1995, p. 169-178.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Anisotropic grain growth in TiO2-doped alumina

AU - Horn, Debra S.

AU - Messing, Gary L.

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AB - Grain growth in TiO2-doped alumina was studied in a high density, ultrafine matrix (0.4 μm. Normal grain growth, anisotropic grain growth and abnormal grain growth were observed. With 0.15-0.4 wt.% TiO2, samples initially undergo normal grain growth until a crystal microstructure is attained and anisotropic grain growth in nucleated. Large anisotropic, platelet-shaped grains grow rapidly by a step growth process until impingement of the large grains essentially stops further growth. The volume fraction of anisotropic grains ranged from 20 to 100 vol.% suggesting that physical properties dependent on grain shape and volume fraction can be tailored. Critical requirements are proposed for the in situ growth of anisotropic grains.

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