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A Martensite Peculiar to Thin Foils of a Ti50Ni49Fei Shape Memory Alloy

Published online by Cambridge University Press:  25 February 2011

Tsugio Tadaki ,
Sukeyoshi Yamamoto  and
Ken'ichi Shimizu
Tsugio Tadaki
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, 8–1 Mihogaoka, Ibaraki, Osaka 567, Japan
Sukeyoshi Yamamoto
Affiliation:
Sumitomo Metal Industries, Ltd., Advanced Technology Research Laboratories, 1–8 Fuso-cho, Amagasaki, Hyogo 660, Japan
Ken'ichi Shimizu
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, 8–1 Mihogaoka, Ibaraki, Osaka 567, Japan
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Abstract

A peculiar martensite found in thin foils of a Ti5oNi49Fei shape memory alloy has been examined by transmission electron microscopy and electron diffraction, which was entirely different from the R phase and the B19' and B19 martensites widely known so far in the Ti-Ni based alloys. The thin foil martensite is monoclinic with a=0.700nm, b=0.994nm, c=0.632nm and γ =94.4°. The lattice correspondence between the B2 parent phase and the martensite is as follows: <210>B2→ <100>M, <230>B2→ <010>m, <002>B2→ <001>m. The formation conditions and atom positions in the unit cell of the thin foil martensite are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 246: Symposium M – Shape-Memory Materials and Phenomena--Fundamental Aspects and Applications , 1991 , 219
Copyright
Copyright © Materials Research Society 1992

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