Processing of nano-grained materials

Robert S Averback, H. J. Höfler, R. Tao

Research output: Contribution to journalArticle

Abstract

Sintering and deformation were studied in nano-grained (n-)TiO2 and n-TiAl as part of a program to develop materials for near-net shaping and superplasticity applications. An important concern for processing nano-grained materials is the control of grain growth during both densification and deformation. In this study, the effectiveness of doping n-TiO2 with yttrium for controlling grain growth during isothermal annealing was examined. In addition, an empirical constitutive law for the densification of n-TiO2 was determined. Comparison of sinter-forming in n-TiO2 with larger grained oxide ceramics shows many similar features. The studies on TiAl examined the hardness as a function of grain size, indentation time and temperature. At large grain sizes, the hardness obeys the Hall-Petch relation, but below a critical grain size, approximately 30 nm, the hardness decreases with decreasing grain size. Finally, the potential for synthesizing metallic glasses with nanoscale amorphous particles is discussed.

Original languageEnglish (US)
Pages (from-to)169-177
Number of pages9
JournalMaterials Science and Engineering A
Volume166
Issue number1-2
DOIs
StatePublished - Jul 15 1993

ASJC Scopus subject areas

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

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