Microstructure refinement induced by elastic compressive stress in Ti-6Al-4V alloy

Document Type

Journal Article

Publication Title

Journal of Alloys and Compounds

Volume

981

Publisher

Elsevier

School

School of Engineering / Centre for Advanced Materials and Manufacturing

Funders

National Natural Science Foundation of China / Natural Science Foundation of Shanghai / Foundation of Xi'an Key Laboratory of High-Performance Titanium Alloy

Comments

Zhang, Y., Jiang, Y., Si, K., Xin, S., Zhang, S., Hou, F., . . . Zhang, L. C. (2024). Microstructure refinement induced by elastic compressive stress in Ti-6Al-4V alloy. Journal of Alloys and Compounds, 981, article 173700. https://doi.org/10.1016/j.jallcom.2024.173700

Abstract

The B a transformation is a crucial and fundamental phase transformation in titanium and its alloys. This work investigated the effect of elastic compressive stress (ECS) on the microstructure and mechanical property during cooling from B phase region to a + B phase region in Ti-6Al-4V alloy. Results indicated that ECS in this process results in significant refinement and increased aspect ratios of a lamellae (aL) and a colonies (aC). These changes are attributed to the enhanced phase transformation driving force to promote nucleation of a lamellae. The ECS-cooling induced alloy exhibits higher hardness than the stress-free counterpart, mainly resulting from the refined microstructure. This work provides a potential method to tailor the microstructure and improve the mechanical properties of Ti alloys.

DOI

10.1016/j.jallcom.2024.173700

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