Effect of aging and solution annealing on transformation and deformation mechanism of super-elastic Ni50.9%-Ti alloy in nano- scale

Arash Ghabchi, J. Khalil-Allafi, X.W. Liu, O. Söderberg, Erja Turunen, S-P Hannula

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Effects of aging and solution annealing treatment on the super elastic respond of the cold-worked Ni50.9%-Ti thin wire was studied in nano-scale utilizing instrumented nanoindentation. The nanoindentation results were coupled with the tensile test results to provide better insight to the governing deformation mechanisms. The first applied heat treatment heat treatment the cold-worked wire tensile test and nanoindentation results showed better super elastic behavior for the wire subjected to second treatment. Indentation displacement bursts were observed in loading course after both treatments. However, slope changes in unloading course of indents were recorded after second heat treatment which might be due to reverse phase transformation. Surface asperities on the post-indented surface after first treatment were observed far away from indentation stress field by atomic force microscopy.
Original languageEnglish
Title of host publicationProceedings of the European Symposium on Martensitic Transformations, ESOMAT 2009
PublisherEDP Sciences
ISBN (Print)978-2-7598-0480-1
DOIs
Publication statusPublished - 2009
MoE publication typeA4 Article in a conference publication
Event8th European Symposium on Martensitic Transformations, ESOMAT 2009 - Prague, Czech Republic
Duration: 7 Sep 200911 Sep 2009

Conference

Conference8th European Symposium on Martensitic Transformations, ESOMAT 2009
Abbreviated titleESOMAT 2009
CountryCzech Republic
CityPrague
Period7/09/0911/09/09

Keywords

  • aging
  • annealing
  • deformation
  • nanoindentation
  • functional surfaces

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