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Metals 2017, 7(6), 193;

Effects of Solution Treatment on Microstructure and High-Cycle Fatigue Properties of 7075 Aluminum Alloy

College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Light Alloy Research Institute, Central South University, Changsha 410083, China
School of Mechanical Engineering, Hebei University of Architecture, Zhangjiakou 075051, China
Author to whom correspondence should be addressed.
Academic Editor: Filippo Berto
Received: 28 March 2017 / Revised: 19 May 2017 / Accepted: 22 May 2017 / Published: 26 May 2017
(This article belongs to the Special Issue Fatigue Damage)
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This research mainly focused on the effects of solution treatment on high-cycle fatigue properties, microstructure evolution, and fatigue fracture morphology of the high strength aluminum alloy (7075 aluminum alloy). The S-N curves and fatigue performance parameters of the alloy were obtained. We found that longer solution treatment time significantly influences the high-cycle (N ≥ 105) fatigue properties of the Al-Zn-Mg-Cu alloy. Under the loading stress of 240 MPa, and the solution treatment of 2 h compared to 1.5 h, 1 h, and 0.5 h, the fatigue life was respectively improved by about 95.7%, 149%, and 359%. The microstructure observations conducted with a scanning electron microscope (SEM) and transmission electron microscope (TEM) are as follows: recrystallization occurs in the grains of the 7075 aluminum alloy under solution treatment, and the grains become large with the length of the solution treatment time. Cracks mainly initiate from the undissolved large phases, and prolonging the solution time can effectively promote the dissolution of the T phase and S phase, decrease the number of dislocations, and lower the rate of the initiation of fatigue cracks at the undissolved large phases due to dislocation glide and dislocation pile-up. In the second stage of crack propagation, the secondary cracks reduce the driving force and the rate of crack propagation, promoting the fatigue properties of the 7075 aluminum alloy, which can be verified by the observation result that fatigue striation widths become narrower with longer solution treatment times. View Full-Text
Keywords: 7075 aluminum alloy; solution treatment; high-cycle fatigue property; microstructure 7075 aluminum alloy; solution treatment; high-cycle fatigue property; microstructure

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Liu, C.; Liu, Y.; Ma, L.; Yi, J. Effects of Solution Treatment on Microstructure and High-Cycle Fatigue Properties of 7075 Aluminum Alloy. Metals 2017, 7, 193.

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