Influence of alloy element partitioning on strength of primary α phase in Ti-6Al-4V alloy. Issue 5 (May 2018)

• Record Type: Journal Article
• Authors: Zeng, L.R.; Chen, H.L.; Li, X.; Lei, L.M.; Zhang, G.P.
• Is Part Of: Journal of materials science & technology. Volume 34:Issue 5(2018)
• Page Start: 782
• Page End: 787
• Publication Date: 2018-05
• Subjects: Ti-6Al-4V -- Nanoindentation -- Strength -- Alloy element partitioning -- Crystallographic orientation; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2017.07.016
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: The partitioning effect of Al (α-phase stabilizer) and V elements (β-phase stabilizer) on strength of the primary α phases in the α/β Ti-6Al-4V alloy with the bimodal microstructure was investigated. It was found that partitioning of Al and V elements took place in the Ti-6Al-4V alloy during the recrystallization process, leading to the variation of the content of Al and V elements in the primary α phases with changing the volume fraction of the primary α phase. Nanoindentation tests reveal a general trend that the strength of the primary α phases increases with decreasing the volume fraction of the primary α phases, and such trend is independent on the loading direction relative to the c -axis of the α phase. The enhanced strength is attributed to the increase of the content of Al element in the primary α phase, but it is not dominated evidently by the change of the V content. The solid solution strengthening contributed from both the elastic strain introduced by the solute atoms and the variation of the density of states was estimated theoretically.