Detalhes bibliográficos
| Ano de defesa: |
2017 |
| Autor(a) principal: |
Azevedo, Thiago Figueiredo |
| Orientador(a): |
Griza, Sandro |
| Banca de defesa: |
Não Informado pela instituição |
| Tipo de documento: |
Tese
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal de Sergipe
|
| Programa de Pós-Graduação: |
Pós-Graduação em Ciência e Engenharia de Materiais
|
| Departamento: |
Não Informado pela instituição
|
| País: |
Brasil
|
| Palavras-chave em Português: |
|
| Palavras-chave em Inglês: |
|
| Área do conhecimento CNPq: |
|
| Link de acesso: |
https://ri.ufs.br/handle/riufs/3475
|
Resumo: |
The present study is focused on mechanical properties that result from cold rolling and aging treatments applied to TiNbSn alloys comprising different Nb (35% and 42%) and Sn (0% and 2.5%) contents. The alloys were arc melted, homogenized, solubilized, cold rolled and aged at 400 °C for different aging times. A set of characterization tests performed, included microstructural analysis, X-ray diffraction, microhardness, tensile tests, toughness (J) and fracture analysis. The alloys contained all three beta, α” and omega phases after cold rolling, regardless of the alloying content. The solid solution effect led to changes in the alloys’ mechanical behavior. Furthermore, the alloys presented alpha phase precipitation, and it led to a peak-aged stage after different aging times due to the Nb content. The alloys containing 42% and 35% Nb content reached the peakaged stage within 48 and 72 h, respectively. The α phase precipitation in the alloys at peak-aged stage increased the hardness, tensile strength and elastic modulus of the alloys; however, it also caused ductility and toughness decrease. The fine dispersed precipitates of the alpha phase generated small and shallow dimples, which are a characteristic fracture micromechanism of peak-aged alloys. |
