Evaluation of microstructures of Nb-Cr-Ti alloy system by means of analytical transmission electron microscopy

M. Yoshida, T. Yaegashi, Yasukazu Murakami, D. Shindo, T. Takasugi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The phase diagram of Cr-rich portion of ternary Nb-Cr-Ti alloy system at 1523 K is investigated by means of X-ray diffraction, optical microscopy and analytical transmission electron microscopy. In the region of single phase of (Nb, Ti) Cr2 intermetallics, Laves phase shows C36 dihexagonal structure in the Nb concentration between 0 mol%Nb and 4 mol%Nb. In the range of the Nb concentration more than 12 mol%Nb, Laves phase shows C15 face centered cubic structure. On the other hand, the region of duplex structure consisting of C36 and C15 phase is within the range of the Nb concentration between 4 mol%Nb and 12 mol%Nb. The solubility limit of Nb in Cr solid solution is as small as less than 0.5 mol%Nb. The maximum solubility limit of Cr in Laves phase equilibrated with Cr-b.c.c. solid solution is in a range of about 67-69 mol%Cr depending on a content of Nb and Ti elements. The eutectic path on the Cr-rich portion of the ternary Nb-Cr-Ti alloy system lies in the Cr concentration line between 75 mol%Cr and 80 mol%Cr, and ends at the point of Nb concentration between 10 mol%Nb and 15 mol%Nb.

Original languageEnglish
Pages (from-to)389-396
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume65
Issue number5
DOIs
Publication statusPublished - Jan 1 2001
Externally publishedYes

Fingerprint

Solid solutions
Solubility
Laves phases
Transmission electron microscopy
transmission electron microscopy
microstructure
Microstructure
evaluation
Eutectics
Intermetallics
Phase diagrams
Optical microscopy
X ray diffraction
solid solutions
solubility
eutectics
intermetallics
phase diagrams
microscopy
diffraction

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Evaluation of microstructures of Nb-Cr-Ti alloy system by means of analytical transmission electron microscopy. / Yoshida, M.; Yaegashi, T.; Murakami, Yasukazu; Shindo, D.; Takasugi, T.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 65, No. 5, 01.01.2001, p. 389-396.

Research output: Contribution to journalArticle

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abstract = "The phase diagram of Cr-rich portion of ternary Nb-Cr-Ti alloy system at 1523 K is investigated by means of X-ray diffraction, optical microscopy and analytical transmission electron microscopy. In the region of single phase of (Nb, Ti) Cr2 intermetallics, Laves phase shows C36 dihexagonal structure in the Nb concentration between 0 mol{\%}Nb and 4 mol{\%}Nb. In the range of the Nb concentration more than 12 mol{\%}Nb, Laves phase shows C15 face centered cubic structure. On the other hand, the region of duplex structure consisting of C36 and C15 phase is within the range of the Nb concentration between 4 mol{\%}Nb and 12 mol{\%}Nb. The solubility limit of Nb in Cr solid solution is as small as less than 0.5 mol{\%}Nb. The maximum solubility limit of Cr in Laves phase equilibrated with Cr-b.c.c. solid solution is in a range of about 67-69 mol{\%}Cr depending on a content of Nb and Ti elements. The eutectic path on the Cr-rich portion of the ternary Nb-Cr-Ti alloy system lies in the Cr concentration line between 75 mol{\%}Cr and 80 mol{\%}Cr, and ends at the point of Nb concentration between 10 mol{\%}Nb and 15 mol{\%}Nb.",
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N2 - The phase diagram of Cr-rich portion of ternary Nb-Cr-Ti alloy system at 1523 K is investigated by means of X-ray diffraction, optical microscopy and analytical transmission electron microscopy. In the region of single phase of (Nb, Ti) Cr2 intermetallics, Laves phase shows C36 dihexagonal structure in the Nb concentration between 0 mol%Nb and 4 mol%Nb. In the range of the Nb concentration more than 12 mol%Nb, Laves phase shows C15 face centered cubic structure. On the other hand, the region of duplex structure consisting of C36 and C15 phase is within the range of the Nb concentration between 4 mol%Nb and 12 mol%Nb. The solubility limit of Nb in Cr solid solution is as small as less than 0.5 mol%Nb. The maximum solubility limit of Cr in Laves phase equilibrated with Cr-b.c.c. solid solution is in a range of about 67-69 mol%Cr depending on a content of Nb and Ti elements. The eutectic path on the Cr-rich portion of the ternary Nb-Cr-Ti alloy system lies in the Cr concentration line between 75 mol%Cr and 80 mol%Cr, and ends at the point of Nb concentration between 10 mol%Nb and 15 mol%Nb.

AB - The phase diagram of Cr-rich portion of ternary Nb-Cr-Ti alloy system at 1523 K is investigated by means of X-ray diffraction, optical microscopy and analytical transmission electron microscopy. In the region of single phase of (Nb, Ti) Cr2 intermetallics, Laves phase shows C36 dihexagonal structure in the Nb concentration between 0 mol%Nb and 4 mol%Nb. In the range of the Nb concentration more than 12 mol%Nb, Laves phase shows C15 face centered cubic structure. On the other hand, the region of duplex structure consisting of C36 and C15 phase is within the range of the Nb concentration between 4 mol%Nb and 12 mol%Nb. The solubility limit of Nb in Cr solid solution is as small as less than 0.5 mol%Nb. The maximum solubility limit of Cr in Laves phase equilibrated with Cr-b.c.c. solid solution is in a range of about 67-69 mol%Cr depending on a content of Nb and Ti elements. The eutectic path on the Cr-rich portion of the ternary Nb-Cr-Ti alloy system lies in the Cr concentration line between 75 mol%Cr and 80 mol%Cr, and ends at the point of Nb concentration between 10 mol%Nb and 15 mol%Nb.

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