Grain-resolved analysis of localized deformation in nickel-titanium wire under tensile load

0462169 - FZÚ 2017 RIV US eng J - Journal Article
Sedmák, P. - Pilch, Jan - Heller, Luděk - Kopeček, Jaromír - Wright, J. - Sedlák, Petr - Frost, Miroslav - Šittner, Petr
Grain-resolved analysis of localized deformation in nickel-titanium wire under tensile load.
Science. Roč. 353, č. 6299 (2016), 559-562. ISSN 0036-8075. E-ISSN 1095-9203
R&D Projects: GA MŠMT LM2015088; GA ČR GA14-15264S; GA ČR GAP107/12/0800; GA ČR GPP108/12/P111
Institutional support: RVO:68378271 ; RVO:61388998
Keywords : martensitic transformation * 3D x-ray diffraction * shape memory alloys * internal stress * NiTi wire * localized deformation * tension
Subject RIV: BM - Solid Matter Physics ; Magnetism; BI - Acoustics (UT-L)
Impact factor: 37.205, year: 2016

The stress-induced martensitic transformation in tensioned nickel-titanium shape-memory alloys proceeds by propagation of macroscopic fronts of localized deformation. We used three-dimensional synchrotron x-ray diffraction to image at micrometer-scale resolution the grain-resolved elastic strains and stresses in austenite around one such front in a prestrained nickel-titanium wire. We found that the local stresses in austenite grains are modified ahead of the nose cone–shaped buried interface where the martensitic transformation begins.

Permanent Link: http://hdl.handle.net/11104/0261691