Precipitation behavior of (Mo) phase on dislocations in Mo 5SiB5 phase

Nobuaki Sekido, Ridwan Sakidja, John H. Perepezko

Research output: Contribution to conferencePaperpeer-review

Abstract

The precipitation behavior of a Mo solid solution in a Mo 5SiB2(T2) matrix has been characterized by transmission electron microscopy. The T2 phase has a distinct range of homogeneity and a temperature dependent solubility range. In order to provide for the homogeneity range of the T2 phase, a significant concentration of constitutional vacancies has been proposed as a defect mechanism. Upon annealing, the excess vacancies aggregate and collapse into dislocations, which then act as the heterogeneous nucleation sites for the subsequent Mo precipitation. The formation of the preferential variants of precipitates is discussed in terms of the interaction between the transformation strain upon precipitation and the stress fields around dislocations, as well as the crystallographic mismatch between the Mo precipitates and the T2 matrix.

Original languageEnglish
Pages357-362
Number of pages6
Publication statusPublished - 2005 Dec 1
Externally publishedYes
EventInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 - Phoenix, AZ, United States
Duration: 2005 May 292005 Jun 3

Other

OtherInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005
CountryUnited States
CityPhoenix, AZ
Period05/5/2905/6/3

Keywords

  • Dislocation
  • Heterogeneous Nucleation
  • Precipitation
  • Vacancy

ASJC Scopus subject areas

  • Engineering(all)

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