Cycling of Ultrafine-Grained Ti-6Al-4V ELI Alloy: Microstructural Changes and Enhanced Fatigue Limit

Abstract:

Ti-6Al-4V ELI (extra low interstitials) was processed by equal channel angular pressing in order to obtain an ultrafine-grained (UFG) microstructure which is known to enhance the fatigue behavior of metallic materials. Fatigue properties of UFG Ti-6Al-4V ELI were studied by strain and stress controlled fatigue tests. UFG Ti-6Al-4V ELI shows an improvement of the fatigue behavior compared to conventional grain (CG) size counterpart. Microstructural investigations prior to and after fatigue testing confirm a high structural stability of the UFG material. Hence, the UFG alloy has a high potential for prospective use in biomedical and engineering applications.

• Periodical: Materials Science Forum (Volumes 584-586)
• Pages: 827-832
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.584-586.827
• Online since: June 2008
• Authors: Lilia R. Saitova, Heinz Werner Höppel, Matthias Göken, A.R. Kilmametov, Irina P. Semenova, Ruslan Valiev
• Keywords: Cyclic Deformation, Fatigue Limit, Softening, Ti₆Al₄V, Ultrafine Grained Microstructure

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