Additivity rule, isothermal and non-isothermal transformations on the basis of an analytical transformation model

F. Liu, C. Yang, G. Yang, Y. Zhou

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

In the present work, the "additivity rule" was proved to be compatible with an analytical transformation model assuming mixed nucleation (with site saturation and continuous nucleation as two extremes), for some specified conditions. Combining the analytical model with numerical calculations, it is practicable to allow a conversion of continuous heating or cooling transformation (CHT or CCT) data into isothermal transformation data (TTT), and also a conversion of TTT data into CHT or CCT data, under a restrictive assumption of constant cooling or heating rate. From a comparative study between TTT and CHT data, the effective activation energy was found to increase and decrease, respectively, as compared with that before the CHT-TTT and TTT-CHT conversions; the growth exponent was proved to hold almost invariably, independent of the conversions. Real applications in the crystallization of amorphous Mg-Ni alloy and in the gamma-alpha massive transformation in Fe-Mn alloy show that the above conclusions are reasonable.

Original languageEnglish
Pages (from-to)5255-5267
Number of pages13
JournalActa Materialia
Volume55
Issue number15
DOIs
StatePublished - Sep 2007

Keywords

  • Additivity rule
  • Analytical
  • Isothermal
  • Non-isothermal
  • Transformation

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