α-lamella orientation dependence of fatigue crack propagation in as-forged TiB/near α-Ti composite

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Fatigue Pub Date : 2024-09-16 DOI:10.1016/j.ijfatigue.2024.108610

Fanchao Meng , Rui Zhang , Shuai Wang , Fengbo Sun , Ming Ji , Cunyu Wang , Lujun Huang , Lin Geng

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Abstract

The influence of microstructural attributes on fatigue crack propagation in titanium matrix composite remains largely unexplored. The impact of α-lamella crystallographic and spatial orientations on fatigue crack propagation in an as-forged TiB/near α-Ti composite was investigated using innovative quantitative tilt fractography and electron backscattered diffraction techniques. Crack initiation was observed from TiB cluster defects, followed by faceted fatigue crack propagation across α lamellae. In long-life failure, facet formation appears to be driven by a combination of slip and resolved normal stress across the facet plane, with facet angles relative to the loading direction (LD) predominantly ranging between 30.0° and 50.0°. In contrast, short-life failure exhibited shear deformation as the primary mode, with facet angles relative to LD mainly between 40.0° and 50.0°. Crystallographic orientation analysis revealed that facets predominantly formed near the basal plane in both long-life and short-life failures. Crack-initiation microstructural neighborhoods favoring basal slip increased effective slip length over α lamellae, reducing resistance to crack propagation. This led to a rise in basal geometrically necessary dislocation (GND) density from 1.2 × 10¹³ m⁻² in long-life to 3.6 × 10¹³ m⁻² in short-life failures. These observations highlight the dominance of spatial and crystallographic orientations of α lamellae in controlling fatigue crack propagation.

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锻造钛B/近似α-钛复合材料疲劳裂纹扩展的α-拉美拉取向依赖性

微结构属性对钛基复合材料疲劳裂纹扩展的影响在很大程度上仍未得到研究。我们采用创新的定量倾斜分形和电子反向散射衍射技术，研究了α-拉梅拉晶体学和空间取向对锻造钛B/近α-钛复合材料疲劳裂纹扩展的影响。观察到裂纹从 TiB 簇缺陷处开始，随后在 α 薄片上出现刻面疲劳裂纹扩展。在长寿命失效中，刻面的形成似乎是由滑移和跨刻面平面的解析法向应力共同驱动的，刻面相对于加载方向（LD）的角度主要在 30.0° 和 50.0° 之间。相反，短寿命失效的主要模式是剪切变形，相对于 LD 的面角主要在 40.0° 和 50.0° 之间。晶体取向分析表明，在长寿命和短寿命失效中，刻面主要在基底面附近形成。有利于基面滑移的裂纹引发微结构邻域增加了α薄片的有效滑移长度，降低了裂纹扩展的阻力。这导致基底几何必要位错（GND）密度从长寿命故障的 1.2 × 1013 m-2 上升到短寿命故障的 3.6 × 1013 m-2。这些观察结果突显了α薄片的空间和晶体取向在控制疲劳裂纹扩展中的主导作用。

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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.