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Microstructural Evolution and Mechanical Properties of Al3-based Multi-Phase Alloys

Published online by Cambridge University Press:  21 March 2011

Seiji Miura*
Affiliation:
Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060–8628, Japan.
Juri Fujinaka
Affiliation:
Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060–8628, Japan.
Rikiya Nino
Affiliation:
Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060–8628, Japan.
Tetsuo Mohri
Affiliation:
Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060–8628, Japan.
*Corresponding
1 Corresponding author: miura@eng.hokudai.ac.jp
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Abstract

A preliminary study on the phase relations in Al-Mo-Ti-X quaternary systems in the vicinity of Ti-trialuminide phases is carried out with various additives X= Mn, Cr, Fe, Ni and Ag. In the Al-Mo-Ti ternary system, a bcc-phase field extends from the Ti-Mo edge to high Al region at high temperatures and it equilibrates with a DO22-Al3Ti phase containing a large amount of Mo. It is found that, by additions of X= Mn, Cr, Fe or Ni, an L12-(Al, X)3 Ti phase appears near the two-phase region composed of the DO22-Al3 Ti and bcc phases in the Al-Mo-Ti ternary system. By heat treatment at 1223 K, the bcc phase of quaternary alloys decomposes into the A15-Mo3Al, DO22, L12 and/or σ phases, and no voids are observed. The mechanical properties of these alloys are also investigated by Vickers hardness.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

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Footnotes

2

Graduate Student, Graduate School of Engineering, Hokkaido University.

References

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