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Understanding Precursor Phenomena for the R-Phase Transformation in Ti-Ni-Based Alloys

Published online by Cambridge University Press:  31 January 2011

Daisuke Shindo ,
Yasukazu Murakami  and
Takuya Ohba
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Abstract

Precursor phenomena are critical issues for martensitic transformations. In this article, we show recent progress in understanding precursor phenomena to the R-phase transformation, which is important for both fundamentals and applications. Structural modulation in the parent phase was intensively studied by means of detailed analyses of the weak diffuse scattering of electrons with the aid of recently developed energy-filtered transmission electron microscopy coupled with x-ray diffraction. A peculiar domain-like structure, which originates from static transverse atomic displacements in the parent phase, was discovered by virtue of these advanced methods. The characteristics of this structure (e.g., size, shape, and temperature-dependence), as well as its role in the subsequent R-phase transformation, are discussed.

Type
Research Article
Information
MRS Bulletin , Volume 27 , Issue 2: Science and Technology of Shape-Memory Alloys: New Developments , February 2002 , pp. 121 - 127
Copyright
Copyright © Materials Research Society 2002

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