A Study of Low Young's Modulus Ti-15Ta-15Nb Alloy Using TEM Analysis.
Materials (Basel)
; 13(24)2020 Dec 14.
Article
em En
| MEDLINE
| ID: mdl-33327375
ABSTRACT
The microstructural characteristics and Young's modulus of the as-cast Ti-15Ta-15Nb alloy are reported in this study. On the basis of the examined XRD and TEM results, the microstructure of the current alloy is essentially a mixture (α + ß+ α' + αâ³ + ω + H) phase. The new H phase has not previously been identified as a known phase in the Ti-Ta-Nb alloy system. On the basis of examination of the Kikuchi maps, the new H phase belongs to a tetragonal structural class with lattice parameters of a = b = 0.328 nm and c = 0.343 nm, denoting an optimal presentation of the atomic arrangement. The relationships of orientation between these phases would be {0001}α//{110}ß//{1¯21¯0}ω//{101¯}H and (011¯0)α//(11¯2)ß//(1¯010)ω//(121)H. Moreover, the Young's modulus of the as-cast Ti-15Ta-15Nb alloy is approximately E = 80.2 ± 10.66 GPa. It is implied that the Young's modulus can be decreased by the mixing of phases, especially with the presence of the H phase.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Materials (Basel)
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Taiwan