Yielding nature and Hall-Petch relationships in Ti-6Al-4V alloy with fully equiaxed and bimodal microstructures. (November 2019)

• Record Type: Journal Article
• Authors: Chong, Yan; Deng, Guanyu; Gao, Si; Yi, Jangho; Shibata, Akinobu; Tsuji, Nobuhiro
• Is Part Of: Scripta materialia. Number 172(2019)
• Page Start: 77
• Page End: 82
• Publication Date: 2019-11
• Subjects: Ti-6Al-4V -- Grain size -- Hall-Petch relationship -- Yield strength; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.07.015
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Hall-Petch relationships were studied in Ti-6Al-4V alloy with fully equiaxed and two different bimodal microstructures obtained by intercritical annealing at 850 °C (BM850) and 950 °C (BM950). The Hall-Petch coefficient of the BM850 microstructure composed of harder primary α grains and softer transformed β areas was identical to that of the fully equiaxed microstructure, indicating the same nature of yielding behavior determined by the resisting ability of equiaxed α grain boundaries against slip transfer in both microstructures. The BM950 microstructure having smaller amount of primary α, however, showed a yielding nature like a particle-strengthened composite, leading to the different Hall-Petch relationship. Graphical abstract: Unlabelled Image