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

KAYNAK Y., Tobe H., Noebe R. D., KARACA H. A., Jawahir I. S.

SCRIPTA MATERIALIA, cilt.74, ss.60-63, 2014 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 74
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1016/j.scriptamat.2013.10.023
  • Dergi Adı: SCRIPTA MATERIALIA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.60-63
  • Anahtar Kelimeler: NiTi, Shape memory alloys, Cryogenic machining, Machining-induced layer, Twinning deformation, SHAPE-MEMORY ALLOY, CHANNEL ANGULAR EXTRUSION, DEFORMATION, TI50NI47FE3, MARTENSITE
  • Marmara Üniversitesi Adresli: Evet

Özet

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 (1 1 4)(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. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.