Mechanism of significant plasticity improvement via dual assistance with electric current and hydrogen in the Ti-22Al-25Nb alloy

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-06-25 DOI:10.1016/j.scriptamat.2025.116831

Bin Shao, Yuzhuo Shao, Wei Tang, Qiwei Wang, Yingying Zong, Debin Shan, Bin Guo

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Abstract

This study proposes a dual-assisted forming method using electric current and hydrogen to address the challenges of poor plasticity and high deformation temperatures induced by brittle cracking in the Ti-22Al-25Nb alloy. The optimal parameters for this novel technology were identified as a current density of 7.5 A/mm² and hydrogen content of 0.1 wt.%. These conditions enabled a reduction in the forming temperature to 750 °C. At this temperature, the ultimate tensile stress decreased by 51.4%, reaching 518 MPa, whereas the elongation reached 32.4%. This significant improvement in plasticity is attributed to two primary mechanisms. First, the decomposition of the O phase during deformation generated fine O-phase particles on the nanometer scale, dispersed within the B2/β phase. This dispersion inhibited the deformation-induced cracking in the O phase and facilitated the activation of a significant amount of (001)_O-basal slip. Second, a fully dynamic recrystallized (DRX) microstructure developed in the necking region.

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电流和氢双重辅助对Ti-22Al-25Nb合金塑性显著改善的机理

针对Ti-22Al-25Nb合金脆性开裂导致塑性差、变形温度高的问题，提出了电流和氢气双辅助成形方法。该新技术的最佳参数为电流密度为7.5 a /mm²，氢含量为0.1 wt.%。这些条件使成形温度降低到750°C。在此温度下，拉伸极限应力降低51.4%，达到518 MPa，伸长率达到32.4%。这种显著的可塑性改善可归因于两个主要机制。首先，变形过程中O相的分解产生了纳米级的细小的O相颗粒，分散在B2/β相中。这种分散抑制了O相中变形引起的开裂，并促进了大量（001）O基滑移的激活。其次，在颈缩区形成了完全动态再结晶（DRX）组织。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.