Mechanics of superelasticity in Ti–30Nb–(8–10)Ta–5Zr alloy / E.G. Obbard in Acta materialia, Vol. 58 N° 10 (Juin 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3557–3567 Titre : Mechanics of superelasticity in Ti–30Nb–(8–10)Ta–5Zr alloy Type de document : texte imprimé Auteurs : E.G. Obbard, Auteur ; Y.L. Hao, Auteur ; T. Akahori, Auteur Année de publication : 2011 Article en page(s) : pp. 3557–3567 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : 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 [article] Mechanics of superelasticity in Ti–30Nb–(8–10)Ta–5Zr alloy [texte imprimé] / E.G. Obbard, Auteur ; Y.L. Hao, Auteur ; T. Akahori, Auteur . - 2011 . - pp. 3557–3567. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3557–3567 Mots-clés : 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

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