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

IF 3.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2025-05-30 DOI:10.1007/s40195-025-01874-6

Zihao Qiu, Chenwei Shao, Shuaijie Han, Yang Lu, Zhiqin Wang, Hanzhong Liu, Zhenjun Zhang, Zhefeng Zhang

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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.

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非均相双晶双片层Ti-38644合金断裂强度与塑性的权衡关系

亚稳态β钛合金具有优异的综合力学性能，是实现轻量化、高强度的理想材料。然而，克服强度和延性之间的权衡关系仍然是一个重大挑战。在本研究中，通过精心设计的轧制、拉伸和热处理相结合，引入非均匀双晶双片层（BG-BL）组织，优化了Ti-38644合金的力学性能。结果表明：制备的BG-BL Ti-38644合金抗拉强度为~ 1500mpa，总伸长率为18%。特别是BG-BL Ti-38644合金的高强度延伸组合，突破了所有钛合金中的权衡关系。低位错的再结晶晶粒增强了Ti-38644合金的塑性，而高度变形的拉长晶粒则是提高合金强度的主要因素。本研究为设计高强度、高延展性钛合金提供了新的思路。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.