The effects of machining on the microstructure and transformation behavior of NiTi Alloy

This study presents evidence of a machining-induced deformation layer in a NiTi shape memory alloy and the subsequent effect of this layer on the underlying transformation behavior of the material. Severe twinning-induced deformation was observed in the substrate of samples pre-cooled and machined b...

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Bibliographic Details
Published in:Scripta materialia 2014-03, Vol.74, p.60-63
Main Authors: Kaynak, Y., Tobe, H., Noebe, R.D., Karaca, H.E., Jawahir, I.S.
Format: Article
Language:English
Subjects:
Cryogenic machining
Deformation
Intermetallics
Machining
Machining-induced layer
Nickel base alloys
Nickel compounds
Nickel titanides
NiTi
Shape memory alloys
Titanium compounds
Twinning deformation
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Summary:This study presents evidence of a machining-induced deformation layer in a NiTi shape memory alloy and the subsequent effect of this layer on the underlying transformation behavior of the material. Severe twinning-induced deformation was observed in the substrate of samples pre-cooled and machined by orthogonal cutting under cryogenic conditions, while (114)B2-type deformation twinning and significant dislocation activity was observed after dry machining of the NiTi. In addition, cryogenic machining resulted in a much deeper affected zone than machining under dry conditions.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2013.10.023