Preparation and properties of alloys strengthened by nano-particles of oxide or nitride -basic and application studies on internal oxidation/nitriding at low temperatures-

Jun Takada

Research output: Contribution to journalArticle

Abstract

Systematic studies on internal oxidation/nitriding of alloys at low temperatures have not been reported in contrast to high temperature oxidation/nitriding reported so far. However, the oxidation/nitriding at low temperatures has great advantages on discussion of the diffusion process of dissolved oxygen in α-Fe and the formation of nanoparticles of oxide/nitride which effects upon various properties of the alloys. In this paper, characteristics and mechanism of internal oxidation/nitriding behavior are explained. Next the determination of oxygen diffusion coefficient in α-Fe by using internal oxidation of three different alloys is introduced on the basis of the oxidation rate equation and the thermodynamic data. Furthermore the development of novel Mo alloys having high ductility and high strength due to microstructure controlling by distribution of small nitride particles through a new multi-step nitriding method is also described.

Original languageEnglish
Pages (from-to)841-848
Number of pages8
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume53
Issue number11
DOIs
Publication statusPublished - Nov 2006

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Internal oxidation
Nitriding
Nitrides
Oxides
Temperature
Oxidation
Thermooxidation
Dissolved oxygen
Ductility
Thermodynamics
Oxygen
Nanoparticles
Microstructure

Keywords

  • Dispersion strengthened alloy
  • Internal oxidation/nitriding
  • Low temperature
  • Nano-particle dispersion
  • Oxygen diffusion coefficient

ASJC Scopus subject areas

  • Mechanical Engineering
  • Metals and Alloys

Cite this

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abstract = "Systematic studies on internal oxidation/nitriding of alloys at low temperatures have not been reported in contrast to high temperature oxidation/nitriding reported so far. However, the oxidation/nitriding at low temperatures has great advantages on discussion of the diffusion process of dissolved oxygen in α-Fe and the formation of nanoparticles of oxide/nitride which effects upon various properties of the alloys. In this paper, characteristics and mechanism of internal oxidation/nitriding behavior are explained. Next the determination of oxygen diffusion coefficient in α-Fe by using internal oxidation of three different alloys is introduced on the basis of the oxidation rate equation and the thermodynamic data. Furthermore the development of novel Mo alloys having high ductility and high strength due to microstructure controlling by distribution of small nitride particles through a new multi-step nitriding method is also described.",
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