The Structure and Shape Memory of the Hot Extruded NiTi Alloy

Tomasz Goryczka , Zdzisław Lekston , Jerzy Dybich , Maciej Zubko , Tadeusz Wierzchoń , Danuta Stróż , Józef Lelątko


The paper presents results of structural studies of hot extruded NiTi shape memory alloy that is in the B2 phase at room temperature. Texture of the alloy was determined from the X-ray diffraction measurements. It was found that in result of 60 % sample reduction (at a cross-section of a bar formed by hot extrusion) weak axial texture - type <110>B2 was formed. The volume of the grains oriented in this way was approx. 20 %. Basing on metallographic observations it was also found that the size of the grains formed as a result of the thermomechanical treatment was uniform with the average area of 1700 μm2. This information is significant from the point of view of functional properties. Hot extruded alloy revealed presence of the reversible martensitic transformation. Its characteristic temperatures were slight higher than in as-cast alloy. Moreover, the extruded NiTi alloy showed 100 % of the shape recovery.
Author Tomasz Goryczka - University of Silesia (UŚ) [University of Silesia in Katowice]
Tomasz Goryczka,,
, Zdzisław Lekston - University of Silesia (UŚ) [University of Silesia in Katowice]
Zdzisław Lekston,,
, Jerzy Dybich - BHH Mikrohuta Sp. z o.o. [BHH Mikrohuta sp. z o.o.]
Jerzy Dybich,,
, Maciej Zubko - University of Silesia (UŚ) [University of Silesia in Katowice]
Maciej Zubko,,
, Tadeusz Wierzchoń (FMSE / DSE)
Tadeusz Wierzchoń,,
- Division of Surface Engineering
, Danuta Stróż - University of Silesia (UŚ) [University of Silesia in Katowice]
Danuta Stróż,,
, Józef Lelątko - University of Silesia (UŚ) [University of Silesia in Katowice]
Józef Lelątko,,
Journal seriesKey Engineering Materials, ISSN , e-ISSN 1662-9795
Issue year2016
Publication size in sheets0.5
Keywords in EnglishHot extrusion; NiTi shape memory alloy; texture; phase transitions; one way shape memory effect;
Languageen angielski
The structure and shape memory of the hot extruded NiTi alloy.pdf 3.01 MB
Score (nominal)0
Score sourcejournalList
ScoreMinisterial score = 0.0, 09-01-2020, ArticleFromJournal
Ministerial score (2013-2016) = 0.0, 09-01-2020, ArticleFromJournal
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