Breaking Strength-Ductility Trade-off Relation in Ti-38644 Alloy with Heterogeneous Bi-Grain Bi-Lamella Structure

doi:10.1007/s40195-025-01874-6

Abstract

Abstract:

Metastable β titanium alloy is an ideal material for lightweight and high strength due to its excellent comprehensive mechanical properties. However, overcoming the trade-off relation between strength and ductility remains a significant challenge. In this study, the mechanical properties of Ti-38644 alloy were optimized by introducing a heterogeneous bi-grain bi-lamella (BG-BL) structure through a well-designed combination of rolling, drawing and heat treatment. The results demonstrate that the present BG-BL Ti-38644 alloy shows a tensile strength of ~ 1500 MPa and a total elongation of 18%. In particular, the high strength-elongation combination of the BG-BL Ti-38644 alloy breakthroughs the trade-off relation in all the titanium alloys available. The recrystallized grains with low dislocation enhance the ductility of the Ti-38644 alloy, while the highly distorted elongated grains mainly contribute to the high strength. The present study provides a new principle for designing Ti alloys with superior strength and ductility.

Key words: Ti alloy, Heterogeneous structure, Strength, Ductility, Trade-off relation

Zihao Qiu, Chenwei Shao, Shuaijie Han, Yang Lu, Zhiqin Wang, Hanzhong Liu, Zhenjun Zhang, Zhefeng Zhang. Breaking Strength-Ductility Trade-off Relation in Ti-38644 Alloy with Heterogeneous Bi-Grain Bi-Lamella Structure[J]. Acta Metallurgica Sinica (English Letters), 2025, 38(8): 1312-1316.

Figures/Tables 3

Fig. 1 Typical microstructures in Ti-38644 alloy after BG-BL processing. a-c Axial microstructures: a EBSD image; b recrystallized grain distribution image; c Schmid factor distribution in different crystallographic orientations. d-i Radial images of the microstructures: d EBSD image; e EBSD image of recrystallized grains (RGs) larger than 1 μm; f SEM image; g-i nano-precipitated α phase TEM images within BG structure: g recrystallized grains; h elongated grains; i statistics of the length and width of the α lamella

Fig. 2 Mechanical properties of Ti-38644 alloy with BG-BL structure. a Tensile engineering stress-strain curves; b tensile true strain-work hardening rate curves; c the relationship between tensile strength and elongation of the Ti-38644 alloy compared with other β-titanium alloys available

Fig. 3 Schematic diagram showing the evolution mechanism of high strength and high ductility caused by bi-grain & bi-lamella structure

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