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Effect of Minor Alloying on the Microstructure, Superplastic Behavior and Tensile Properties of Ti-Al-V-Mo Alloy

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Abstract:

The effects of minor additions of alloying elements Fe/Ni/Co (0.5wt.%), B (0.01–0.1wt.%), and Y (0.2wt.%) on the superplastic behavior, microstructural evolution and mechanical properties of Ti-4 wt.%Al-3wt.%Mo-1wt.%V alloys are investigated. By increasing the high-angle grain boundary fraction and related facilitation of the grain boundary sliding, these elements reduce the flow stress values at the initial deformation stage and improve flow stability at a steady state. The most pronounced effect is found at low deformation temperatures when acceleration of recrystallization and globularization of the microstructure is critical. As a result, minor additions of the studied elements provide good superplasticity at relatively low temperatures of 625–775 °C (m≈0.50 and elongation to failure ≈ 500–1000%) and post-forming room-temperature strength (YS≈830 MPa and UTS≈990 MPa).

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Periodical:

Diffusion Foundations and Materials Applications (Volume 39)

Pages:

23-32

DOI:

https://doi.org/10.4028/p-L9sR6H

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Online since:

January 2026

Authors:

Anton D. Kotov, Maria N. Postnikova, Alena Y. Trishina, Matvey A. Zasypkin, Svetlana V. Medvedeva, Anastasia V. Mikhaylovskaya*

Keywords:

Dynamic Grain Growth, Flow Stress, Microstructural Evolution, Superplasticity, Titanium Alloys

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