| Titre : | Mechanics of superelasticity in Ti–30Nb–(8–10)Ta–5Zr alloy (2011) |
| Auteurs : | E.G. Obbard, Auteur ; Y.L. Hao, Auteur ; T. Akahori, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Acta materialia (Vol. 58 N° 10, Juin 2010) |
| Article en page(s) : | pp. 3557–3567 |
| Note générale : | Métallurgie |
| Langues : | Anglais |
| Tags : | Martensitic phase transformation Shape memory alloys Synchrotron radiation Titanium X-ray diffraction |
| Résumé : | The superelastic behaviour of Ti–30Nb–10Ta–5Zr and Ti–30Nb–8Ta–5Zr (wt.%) biomedical alloys was investigated by tensile testing and in situ synchrotron X-ray diffraction. The phenomenological theory of martensite crystallography and texture prediction based on the Schmid law indicate that α″ in Ti–30Nb–10Ta–5Zr forms in untwinned variants. Measurement of single-crystal elastic constants using an Eshelby–Kroener–Kneer self-consistent model shows that the 10-Ta alloy has a C′ modulus 3 GPa higher than that of the 8-Ta alloy. That it nevertheless has a proof stress 35 MPa lower can be qualitatively explained by the differences in martensite crystallography. The results suggest that high tensile strength can be maintained for low modulus β-Ti in spite of martensitic transformation by optimizing transformation strains. |
| DEWEY : | 669 |
| ISSN : | 1359-6454 |
| En ligne : | http://www.sciencedirect.com/science/article/pii/S1359645410000960 |
