单级时效对喷射沉积7055铝合金疲劳性能和析出相的影响

doi:10.11896/cldb.24080074

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Abstract Spray deposited 7055 aluminum alloy is widely used in aerospace and defense fields due to its light weight, high strength, good corrosion resistance and toughness. With the development of science and technology, there is a higer requirement for the comprehensive properties of aluminum alloys, especially for fatigue properties. Under the action of long-term strain and alternating load, long-term accumulation of damage will eventually leads to material fracture. In order to improve the fatigue failure, it is necessary to study the influence of different heat treatment processes on the alloy to improve the application performance of the alloy. The microstructure and precipitated phase fatigue fracture morphology of spray deposited 7055 aluminum alloy under three states of under-aging ( 120 ℃×1 h ), peak-aging ( 120 ℃×10 h ) and over-aging ( 120 ℃×44 h ) were analyzed here. The results show that the three aged alloys are under the stress amplitude of 300 MPa. The over-aged alloy shows better fatigue performance, and the fatigue life is 222 000 times. With the extension of aging time, the precipitated phase in the matrix obviously coarsens and grows, and the precipitated phase evolves from GP zone and η′ phase to η′ phase and η phase.

Key words： 7055 aluminum alloy fatigue fracture precipitated phase aging state

Published: 10 November 2025 Online: 2025-11-10

CLC number:

TG166

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	Articles by authors
	GUO Hongfei
	WU Jiafang
	HOU Xiaohu
	ZHAO Min
	ZENG Chao

Cite this article:

GUO Hongfei,WU Jiafang,HOU Xiaohu, et al. Effect of Single-stage Aging on Precipitates and Fatigue Properties of Spray-deposited 7055 Aluminum Alloy[J]. Materials Reports, 2025, 39(21): 24080074-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24080074 OR https://www.mater-rep.com/EN/Y2025/V39/I21/24080074

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