Peculiarities of strain and resistivity variations in TiNi

Simultaneous measurements of electrical resistivity and inelastic strain accumulation in Ti–49.5 at.% Ni undergoing a two-step B2→ R→ B19 ′ martensitic transformation were performed. To exclude the influence of specimen size changes during the deformation all experiments were made in torsion. It was...

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Bibliographic Details
Published inComputational materials science Vol. 19; no. 1; pp. 77 - 80
Main Authors Egorov, Sergey A, Evard, Margarita E, Volkov, Alexandre E
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.12.2000
Subjects
Electrical resistivity
Martensitic transformation
Shape memory effect
TiNi
Twinning
Two-way shape memory effect
81.30.Kf
Two-way shape memory effect
Electrical resistivity
Shape memory effect
TiNi
64.70.K
Martensitic transformation
62.20.F
Twinning
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Summary:Simultaneous measurements of electrical resistivity and inelastic strain accumulation in Ti–49.5 at.% Ni undergoing a two-step B2→ R→ B19 ′ martensitic transformation were performed. To exclude the influence of specimen size changes during the deformation all experiments were made in torsion. It was detected that noticeable part of strain recovery after heating under a stress and active deformation in martensitic state takes place before the start of the reverse transformation and is obviously connected with twinning. At the same time the two-way shape memory effects are caused by the martensitic transformation. The obtained data may be useful for adequate modelling of mechanical properties of the shape memory alloys because allow to connect the macroscopic parameters with microscopic physical processes.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0927-0256
1879-0801
DOI:10.1016/S0927-0256(00)00141-5