Size-dependent martensitic transformation path causing atomic-scale twinning of nanocrystalline NiTi shape memory alloys

Nanocrystalline NiTi alloys were processed by devitrification of an amorphous phase to elucidate the impact of the nanocrystallinity on the thermally induced martensitic phase transformation. Forced by a size-dependent strain energy barrier, atomic-scale twinning leads to a unique path of the marten...

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Published inEurophysics letters Vol. 71; no. 1; pp. 98 - 103
Main Authors Waitz, T, Spišák, D, Hafner, J, Karnthaler, H. P
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.07.2005
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Summary:Nanocrystalline NiTi alloys were processed by devitrification of an amorphous phase to elucidate the impact of the nanocrystallinity on the thermally induced martensitic phase transformation. Forced by a size-dependent strain energy barrier, atomic-scale twinning leads to a unique path of the martensitic phase transformation. The observed twin boundaries of very low energy facilitate arrays of compound twins on atomic scale to overcome the strain energy barrier of the nanograins thus violating the hitherto well-established theory of martensite formation.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2005-10061-y