Author, as appears in the article.: Fabregat Sanjuan, A.; Gispert-Guirado, F.; Ferrando, F.; De la Flor, S.
Department: Enginyeria Mecànica
URV's Author/s: FABREGAT SANJUAN, ALBERT; GISPERT GUIRADO, FRANCESC; FERRANDO PIERA, FRANCESC; DE LA FLOR LOPEZ, SILVIA
Abstract: The properties of NiTiCu alloys strongly depend on their microstructure, which is greatly influenced by the temperature
of the heat treatment (HT) carried out as a final step in their processing. This study investigates the
effect of HT temperatures on the Ti50Ni45Cu5 alloy using dynamic mechanical analysis (DMA). To confirm the
results obtained by the DMA as regards the effects of HT on the microstructure, they were checked against differential
scanning calorimetry (DSC), synchrotron X-ray diffraction (SXRD), hardness measurement and stress-strain
tests. By combining all these experimental techniques with the DMA measurements, the effects of the HT were
determined and attributed to different factors: density dislocation morphology introduced by prior cold work,
recovery and recrystallization processes with texture changes, grain growth, precipitation processes and wt%)
of retained martensite. The results showed that low HT temperatures (400 and 450 °C) are not high enough to
eliminate the effects of the cold work but do provide suitable mechanical properties and lower transformation
temperatures. Medium temperatures (500–575 °C) lead to higher transformation temperatures and maximum
martensitic transformation capacity (ΔH and tan δ) because of the recovery and recrystallization process, but
they also cause a reduction in the mechanical properties (slip stress). High temperatures (600 and 650 °C) produce
a reduction in transformation capacity and a huge decrease in the mechanical properties (slip stress and
ultimate tensile stress).
Research group: Grup d'Investigació en Enginyeria Computacional i Experimental
Thematic Areas: Mechanical engineering Ingeniería mecánica Enginyeria mecànica
licence for use: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 0921-5093
Author identifier: 0000-0002-2878-1369; ; 0000-0003-4450-2734; 0000-0002-6851-1371
Record's date: 2018-02-27
Last page: 291
Journal volume: 712
Papper version: info:eu-repo/semantics/acceptedVersion
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Entity: Universitat Rovira i Virgili
Journal publication year: 2018
First page: 281
Publication Type: Article Artículo Article
Repositori URV