| Full text | |
| Author(s): |
Carvalho Lucas, Fernanda Lidia
[1]
;
Guido, Vanessa
[1]
;
Kafer, Karine Andrea
[2]
;
Bernardi, Heide Heloise
[2, 3]
;
Otubo, Jorge
[2]
Total Authors: 5
|
| Affiliation: | [1] Univ Vale Paraiba UNIVAP, Sao Jose Dos Campos, SP - Brazil
[2] ITA, Sao Jose Dos Campos, SP - Brazil
[3] Fac Tecnol Sao Jose Dos Campos FATEC, Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 17, n. 1, p. 186-190, AUG 2014. |
| Web of Science Citations: | 2 |
| Abstract | |
The current work evaluated the microstructures and martensitic transformation temperatures of NiTi shape memory alloy (SMA) deformed by equal channel angular extrusion (ECAE). The Ti-55.27wt.%Ni alloy was processed by 1 ECAE pass at 250 degrees C using a die with an intersection angle of 120. After processing, samples were annealed at 300 degrees C, 400 degrees C and 500 degrees C for 1h to evaluate the microstructural changes. Microstructural characterization was performed by scanning electron microscopy (SEM) equipped with an energy dispersive spectrometer (EDS) device, and Vickers hardness measurement. Martensitic transformations temperatures were analyzed by differential scanning calorimetry (DSC). Results show that the annealing treatments presented no significant change in the microstructure of the ECAE processed samples. Meanwhile, the DSC curves corresponding to the annealing treatments performed at 300 degrees C and 400 degrees C show two step martensitic transformation related to B2 -> R -> B19'. For the annealing at 500 degrees C, the martensitic transformation temperatures returned to the ST condition, indicating a reduction of the processing defects. (AU) | |
| FAPESP's process: | 10/20565-4 - Influnce of severe plastic deformation and intermetalic precipitates on stainless Fe-Mn-Si-Cr-Ni-Co-(Ti)with SME |
| Grantee: | Karine Andrea Kafer |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 07/08265-2 - Characterization of laser treated surfaces by X-ray diffraction |
| Grantee: | Milton Sergio Fernandes de Lima |
| Support Opportunities: | Regular Research Grants |