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

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.

Keywords

Elastic compressive stress, Microhardness, Microstructure, Phase transformation, Titanium alloy

Document Type

Journal Article

Date of Publication

4-25-2024

Volume

981

Publication Title

Journal of Alloys and Compounds

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

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Link to publisher version (DOI)

10.1016/j.jallcom.2024.173700