Flow behavior and microstructure in Ti-6Al-4V alloy with an ultrafine-grained alpha-single phase microstructure during low-temperature-high-strain-rate superplasticity

Abstract : Grain refinement of Ti-6Al-4V alloy (hereafter designated as Ti-64 alloy) is well recognized as a method for revealing the superplasticity at lower temperature or higher strain rates. This work examines the superplastic flow behavior of the ultrafine-grained (UFG) Ti-64 alloy (d(alpha) = 0.4 mu m) consisting of single a phase in relation to microstructural evolution during deformation at 700 degrees C. Detailed microstructural evaluation reveals that the superplastic deformation mode of grain boundary sliding (tested at 700 degrees C-10(-2) s(-1)) can be reasonably explained in relation to the Ball-Hutchison model at initial stage of deformation and the Gifkins Core-Mantle model at latter stage of deformation. During superplastic deformation, the beta-precipitation occurs and contributes to accommodation mechanism of stress concentration at grain boundaries. This work also discusses the superplastic flow behavior in comparison with flow behaviors according to the Bird-Mukherjee-Dorn (BMD) generalized constitutive relation and the model which considers the effect of dynamic grain growth during deformation.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal.archives-ouvertes.fr/hal-01611092
Contributeur : Mines Albi Ecole Nationale Supérieure Des Mines d'Albi-Carmaux <>
Soumis le : jeudi 5 octobre 2017 - 14:27:56
Dernière modification le : mardi 19 juin 2018 - 22:28:02

Identifiants

Collections

Citation

Hiroaki Matsumoto, Vincent Velay, Akihiko Chiba. Flow behavior and microstructure in Ti-6Al-4V alloy with an ultrafine-grained alpha-single phase microstructure during low-temperature-high-strain-rate superplasticity. Materials and Design, Elsevier, 2015, 66, p. 611-617. 〈http://www.sciencedirect.com/science/article/pii/S0261306914004142〉. 〈10.1016/j.matdes.2014.05.045〉. 〈hal-01611092〉

Partager

Métriques

Consultations de la notice

87