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Effects of Multi-field Synergistic Surface Modification on Fatigue Damage and Nanoscale Precipitation Mechanisms of 7075 Aluminum Alloy.

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Title: Effects of Multi-field Synergistic Surface Modification on Fatigue Damage and Nanoscale Precipitation Mechanisms of 7075 Aluminum Alloy.
Authors: Yue, Xiujie1 (AUTHOR), Wang, Youqiang1 (AUTHOR) xjyue_ytu@126.com, Zhang, Ping2 (AUTHOR) zpqdhhxy@126.com
Source: Journal of Materials Engineering & Performance. Feb2026, Vol. 35 Issue 7, p6873-6883. 11p.
Subjects: Alloy fatigue, Dislocation structure, Water jets, Surface preparation, Aluminum-copper-magnesium alloys, Fatigue cracks, Precipitation (Chemistry)
Abstract: This study focuses on the fatigue reliability of high-strength aluminum alloys under complex service conditions, proposes and constructs a combined ultrasonic impact–solid-particle-enhanced water jet (UIT–SPEWJ) surface modification technology, and systematically explores its influence on the fatigue performance and fracture microstructure evolution mechanism of 7075 aluminum alloy. Through comparative analysis using transmission electron microscopy (TEM) and high-resolution TEM (HRTEM), the mechanisms of fatigue microstructure transformation under individual treatments—ultrasonic impact treatment (UIT) and solid-particle-enhanced water jet (SPEWJ)—and their combination (UIT–SPEWJ) were systematically examined. The results reveal that fatigue cracks in specimens treated with UIT and SPEWJ typically initiate at the surface and propagate in a discontinuous, abrupt manner. In contrast, the UIT–SPEWJ combined treatment shifts crack initiation sites to the subsurface region and significantly reduces crack density. Moreover, UIT promotes the formation of fine and homogeneously distributed second-phase particles, accompanied by dense dislocation structures with lattice fringe spacing measured at 0.2046 nm. SPEWJ alone, however, results in larger, irregularly distributed precipitates and relatively sparse dislocation networks, with a slightly reduced lattice spacing of 0.2023 nm. Notably, the integrated UIT–SPEWJ modification induces refined, dispersed precipitation, and significantly enhances both dislocation density and entanglement, culminating in a compact and complex dislocation mesh with a minimum observed lattice spacing of 0.167 nm. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:This study focuses on the fatigue reliability of high-strength aluminum alloys under complex service conditions, proposes and constructs a combined ultrasonic impact–solid-particle-enhanced water jet (UIT–SPEWJ) surface modification technology, and systematically explores its influence on the fatigue performance and fracture microstructure evolution mechanism of 7075 aluminum alloy. Through comparative analysis using transmission electron microscopy (TEM) and high-resolution TEM (HRTEM), the mechanisms of fatigue microstructure transformation under individual treatments—ultrasonic impact treatment (UIT) and solid-particle-enhanced water jet (SPEWJ)—and their combination (UIT–SPEWJ) were systematically examined. The results reveal that fatigue cracks in specimens treated with UIT and SPEWJ typically initiate at the surface and propagate in a discontinuous, abrupt manner. In contrast, the UIT–SPEWJ combined treatment shifts crack initiation sites to the subsurface region and significantly reduces crack density. Moreover, UIT promotes the formation of fine and homogeneously distributed second-phase particles, accompanied by dense dislocation structures with lattice fringe spacing measured at 0.2046 nm. SPEWJ alone, however, results in larger, irregularly distributed precipitates and relatively sparse dislocation networks, with a slightly reduced lattice spacing of 0.2023 nm. Notably, the integrated UIT–SPEWJ modification induces refined, dispersed precipitation, and significantly enhances both dislocation density and entanglement, culminating in a compact and complex dislocation mesh with a minimum observed lattice spacing of 0.167 nm. [ABSTRACT FROM AUTHOR]
ISSN:10599495
DOI:10.1007/s11665-025-12111-7