Fatigue performance of cold spray repaired aluminium alloy 7075

被引：0

作者：

Bakir, Ali ^{[1
,2
,3
]}

Reed, Rosemary ^{[4
]}

Zhang, Xiang ^{[1
]}

Syed, Abdul ^{[1
]}

Reed, Philippa ^{[4
]}

McNutt, Phil ^{[3
]}

Dore, Matthew ^{[3
]}

机构：

[1] Coventry Univ, Ctr Mfg & Mat, Coventry CV1 5FB, England

[2] TWI Ltd, NSIRC, Cambridge CB21 6AL, England

[3] TWI Ltd, Mat Performance Grp, Cambridge CB21 6AL, England

[4] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, England

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2025年 / 198卷

关键词：

Cold spray; Aluminium alloy 7075; Repair; Fatigue; Structural integrity; MECHANICAL-PROPERTIES; HEAT-TREATMENT; MICROSTRUCTURE; BEHAVIOR; DEPOSITION; AL; DEFORMATION; COATINGS;

D O I：

10.1016/j.ijfatigue.2025.109036

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Cold Spray is a solid-state deposition technique where metal powder particles are accelerated to supersonic velocities by a pressurised gas jet, forming a solid-state bond with the substrate through rapid, localised plastic deformation. Recent advancements in cold spray have enabled its application as an additive manufacturing and repair technology. This study investigates the structural integrity of AA7075 specimens repaired using cold spray, focusing on the crack initiation mechanism and the influence of repair geometry on fatigue behaviour. Results showed that groove-repaired specimens exhibited improved much fatigue life. At lower stress levels (maximum stress 200-250 MPa, R ratio 0.1), repaired specimens demonstrated comparable fatigue performance to undamaged specimens, underscoring the effectiveness of cold spray patches in reducing stress concentrations. Fractography analysis revealed that cracks in the groove- and dent-repaired specimens consistently initiated at the substrate surface from small craters formed during particle impact. These findings highlight the potential of cold spray technology for extending the fatigue life of structural components.

引用

页数：12

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