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Orientation Relationship Between the bcc and σ Phases in Cr-Co Alloys

Published online by Cambridge University Press:  26 February 2011

Toshihiro Doi ,
Makoto Tanimura  and
Yasumasa Koyama
Toshihiro Doi
Affiliation:
doichawan@suou.waseda.jp, Waseda University, Material Science and Engineering, 2-8-26 Nishi-waseda, Shinjyuku-ku, Tokyo, 169-0051, Japan, Tokyo, 169-0051, Japan, +81-3-5286-3789, +81-3-3205-1353
Makoto Tanimura
Affiliation:
tanimura@nissan-arc.co.jp, NISSAN ARC, LTD., Reseach Depertment, 1 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
Yasumasa Koyama
Affiliation:
ykoyama@waseda.jp, Waseda University, Material Science and Engineering, 2-8-26 Nishi-waseda, Shinjyuku-ku, Tokyo, 169-0051, Japan
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Abstract

To obtain deeper understanding of the Ð structure, the formation of the Ð structure in the (bcc¨bcc+Ð) reaction at 873K and 1173K have been investigated by transmission electron microscopy. As for the orientation relationship between the bcc and Ð structures, as a results, both the common first relation of [110]bcc//[110]Ð and three second relations given by α=0°, 33°, and 64° were found in the 1173K annealing, where α is an angle between the [_110]bcc and [001]Ð directions. In the 873K annealing, on the other hand, there was only one second relation with α=0°. Based on the α=0° relation found in both annealing temperatures, the features of atomic shifts in the Ð-structure formation were also discussed.

Keywords

transmission electron microscopy (TEM)alloycrystallographic structure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II08-04
Copyright
Copyright © Materials Research Society 2007

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References

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