Location

Williamsburg, VA

Start Date

1-1-1988 12:00 AM

Description

It is generally recognized that the shape memory effect (SME) is associated the interaction of stress with thermoelastic martensitic transformation [1]. The phase transformations in TiNi alloy was reported to occur as three kinds of B2→R, B2→M, R→M phase transformations [2]. There are different views about premartensitic transformation in TiNi based alloys. Mwang et al [3] reported a transformation sequence in TiNiFe alloy that was the parent B2→Incommensurate I→Rhombohedra R→Martensite M. But many authors [2,4] reported that the premartensitic structure of TiNi alloy is rhombohedra. It is known that the electric resistance increase in the premartensitic transformation range was because of the R-phase taking affect. The electric resistance decrease below the temperature MS was because of the martensite occurence. It is not clear what occurred when the SME alloy is made a plastic deformation. Muang et al [5] was reported that in a TiNi alloy the new rhombohedral phase, perhaps, was induced by stress in the internal friction experiment. In this paper the phase transformation induced by the plastic deformation was studied by the electric resistance method.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

7B

Chapter

Chapter 7: Characterization of Materials

Section

Acoustoelasticity, Stress, and Texture

Pages

1447-1454

DOI

10.1007/978-1-4613-0979-6_68

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

A Study of Strain-Induced Phase Transformations in TiNi Alloy by Electric Resistance Method

Williamsburg, VA

It is generally recognized that the shape memory effect (SME) is associated the interaction of stress with thermoelastic martensitic transformation [1]. The phase transformations in TiNi alloy was reported to occur as three kinds of B2→R, B2→M, R→M phase transformations [2]. There are different views about premartensitic transformation in TiNi based alloys. Mwang et al [3] reported a transformation sequence in TiNiFe alloy that was the parent B2→Incommensurate I→Rhombohedra R→Martensite M. But many authors [2,4] reported that the premartensitic structure of TiNi alloy is rhombohedra. It is known that the electric resistance increase in the premartensitic transformation range was because of the R-phase taking affect. The electric resistance decrease below the temperature MS was because of the martensite occurence. It is not clear what occurred when the SME alloy is made a plastic deformation. Muang et al [5] was reported that in a TiNi alloy the new rhombohedral phase, perhaps, was induced by stress in the internal friction experiment. In this paper the phase transformation induced by the plastic deformation was studied by the electric resistance method.