Yielding nature and Hall-Petch relationships in Ti-6Al-4V alloy with fully equiaxed and bimodal microstructures

By Yan Chong, G. Deng, Si-feng Gao, J. Yi, A. Shibata, N. Tsuji. Scripta Materialia, 2019

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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.

Subfields: Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/0222d5f927cdcff30cd533fe7227246f3a3d2026