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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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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description 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.
doi_str_mv 10.1016/j.scriptamat.2013.10.023
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subjects Cryogenic machining
Deformation
Intermetallics
Machining
Machining-induced layer
Nickel base alloys
Nickel compounds
Nickel titanides
NiTi
Shape memory alloys
Titanium compounds
Twinning deformation
title The effects of machining on the microstructure and transformation behavior of NiTi Alloy
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