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Microstructural Evolution of Dual Multi-Phase Intermetallic Alloys Composed of GCP Ni3Al and Ni3V Phases Containing Ti

Published online by Cambridge University Press:  26 February 2011

Takayuki Takasugi ,
Yasuyuki Kaneno  and
Hiroshi Tsuda
Takayuki Takasugi
Affiliation:
takasugi@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Department of Materials Science, 1-1 Gakuen-cho, Naka-ku, Sakai, 599-8531, Japan, 81-72-254-9314, 81-72-254-9912
Yasuyuki Kaneno
Affiliation:
kaneno@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Department of Materials Science, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
Hiroshi Tsuda
Affiliation:
tsuda@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Department of Materials Science, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
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Abstract

The microstructural evolution of intermetallic alloys, which have dual two-phase microstructure composed of Ni3Al (L12) and Ni3V (D022) phases, was investigated as a function of aging time at 1273K by TEM. At early aging time, the lower microstructure showed structurally decomposed clusters composed of L12 phase and three D022 variant structures. With proceeding aging time, the decomposed L12 and D022 phases coarsened and transformed to lamellar-like microstructures. At longer aging time, the L12 phase disappeared from the lamellar-like microstructure and alternatively the D022 phase composed of two different variant structures prevailed over the lamellar-like microstructures. Corresponding to this microstructural change, the direction of the lamellar and its interfacial plane rotated from <001> to <011> and from {001} to {011}, respectively.

Keywords

microstructuretransmission electron microscopy (TEM)Ni
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II05-21
Copyright
Copyright © Materials Research Society 2007

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