双线定向能沉积-电弧工艺制备的Ti-48Al-2Cr-2Nb合金具有优异的耐高温疲劳裂纹扩展性能

IF 7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2026-01-09 DOI:10.1016/j.ijfatigue.2026.109488

Danqi Zhang , Chen Shen , Lin Wang , Wenlu Zhou , Ting Zhang , Ying Li , Yuelong Zhang , Fang Li , Jianwen Xin , Kanglong Wu , Gang Ruan , Xueming Hua

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引用次数: 0

摘要

作为双线定向能沉积电弧（tw - ed -arc）技术的一个重要里程碑，我们首次报道了一种具有精致的全层状组织的Ti-48Al-2Cr-2Nb （TiAl-4822）合金的优异疲劳裂纹扩展（FCG）性能。在650°C （R = 0.1）循环加载下，对两个正交方向的标准致密拉伸试样进行的FCG试验表明，与常规制造的试件相比，其疲劳阈值高（~ 8.0 MPa·m1/2），裂纹扩展率低。各向同性组织使得抗裂性能对沉积方向不敏感。电子背散射衍射原位拉伸分析表明，晶片间距的细化促进了超位错（SD）活性的提高。片间裂纹和片间裂纹中榫卯互锁形成的弯曲裂纹路径，有效地偏转了裂纹并耗散了能量。高体积分数γ-相（89.4%）和低层错能有利于位错解离和变形孪晶（DT）。这些机制通过孪生相互作用和SD固定共同增强应力松弛，显著提高抗裂性。这项研究不仅报告了以前未记载的性能概况，而且强调了tw - ed电弧在制造高性能钛铝组件方面的技术潜力。

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Fully-lamellar equiaxed structure mediated excellent high-temperature fatigue crack growth resistance of Ti-48Al-2Cr-2Nb alloy fabricated via twin-wire directed energy deposition-arc process

As a critical milestone of twin-wire directed energy deposition-arc (TW-DED-arc) technology, we present the first report on the excellent fatigue crack growth (FCG) performance of a Ti–48Al–2Cr–2Nb (TiAl-4822) alloy with a refined fully-lamellar microstructure. FCG tests conducted on standard compact tension specimens from two orthogonal directions under cyclic loading at 650 °C (R = 0.1) demonstrated a high fatigue threshold (∼8.0 MPa·m^1/2) and low crack propagation rates compared to conventionally manufactured counterparts. The isotropic microstructure rendered crack resistance insensitive to deposition direction. In-situ tensile analysis under electron back scattered diffraction revealed that the enhanced performance originates from refined lamellar spacing, which promoted super-dislocation (SD) activity. Tortuous crack paths formed by mortise–tenon interlocks in inter-lamellar crack and zigzag trans-lamellar cracking, which effectively deflected cracks and dissipate energy. Furthermore, high volume fraction of γ-phase (89.4%) with low stacking fault energy facilitated dislocation dissociation and deformation twinning (DT). These mechanisms collectively enhanced stress relaxation through twin interactions and SD immobilization, significantly improving crack resistance. This study not only reports a previously undocumented property profile but also underscores the technological potential of TW-DED-arc for manufacturing high-performance titanium aluminide components.

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.