Effects of Ti addition on carbon diffusion in molybdenum

Takeshi Inoue, Yutaka Hiraoka, Masahiro Nagae, Jun Takada

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

From the change in fracture mode as a function of distance from the specimen surface, the carbon diffusion distance can be estimated. In addition the diffusion parameter such as activation energy for carbon diffusion in molybdenum can be derived from Arrhenius plots of the carbon diffusion distance and the diffusion temperature. In this work the fracture surface of Mo-Ti alloys after carburizing was examined using a scanning electron microscope. Then the effects of Ti addition on the carbon diffusion behavior in molybdenum were discussed. It was demonstrated, first, the carbon diffusion distance decreases by adding Ti at a given diffusion temperature. Secondly the activation energy for carbon diffusion in Mo-Ti alloys is smaller than that in pure molybdenum. In addition the critical carbon concentration for the transition of fracture mode from intergranular to transgranular in Mo-Ti alloys is larger than that in pure molybdenum. These results are attributed mainly to the preferential combination between a carbon atom and a titanium atom.

Original languageEnglish
Pages (from-to)82-87
Number of pages6
JournalJournal of Alloys and Compounds
Volume414
Issue number1-2
DOIs
Publication statusPublished - Apr 13 2006

Keywords

  • Metals
  • Powder metallurgy
  • Scanning electron microscopy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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