Mechanical Properties Evolution of the 7B04-T74 Aluminum Alloy in the Marine Atmosphere

The 7xxx-series aluminum alloys are widely used in aircrafts due to their superior performance. The evolution of the mechanical properties of the aluminum alloys caused by marine atmospheric corrosion has become a research hotspot due to the increase in aircraft service time in the marine atmospheri...

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Main Authors: Ning Li, Xiaojun Yan, Xuerong Liu, Lu Han, Weifang Zhang
Format: Article
Language:English
Published: MDPI AG 2022-12-01
Series:Metals
Subjects:
Online Access:https://www.mdpi.com/2075-4701/12/12/2173
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author Ning Li
Xiaojun Yan
Xuerong Liu
Lu Han
Weifang Zhang
author_facet Ning Li
Xiaojun Yan
Xuerong Liu
Lu Han
Weifang Zhang
author_sort Ning Li
collection DOAJ
description The 7xxx-series aluminum alloys are widely used in aircrafts due to their superior performance. The evolution of the mechanical properties of the aluminum alloys caused by marine atmospheric corrosion has become a research hotspot due to the increase in aircraft service time in the marine atmospheric environment. In this work, the evolution of the mechanical properties of the 7B04-T74 aluminum alloy was studied by an alternate immersion test. The surface microstructure was analyzed by SEM, EDS, XRD, and OM. The influence of the marine atmospheric corrosion on mechanical properties was studied by tensile and fatigue tests. The results show that the 7B04-T74 aluminum alloy has good corrosion resistance, as only pitting corrosion occurs in the marine atmospheric environment. The tensile properties of the 7B04-T74 aluminum alloy remained fundamentally the same before and after corrosion. The fatigue properties of the 7B04-T74 aluminum alloy were severely reduced, but the localized pitting corrosion only affected the initiation stage of the crack and had little effect on the crack propagation process.
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spelling doaj.art-b5eb01f580dd43bb8be789efcff929952023-11-24T16:42:09ZengMDPI AGMetals2075-47012022-12-011212217310.3390/met12122173Mechanical Properties Evolution of the 7B04-T74 Aluminum Alloy in the Marine AtmosphereNing Li0Xiaojun Yan1Xuerong Liu2Lu Han3Weifang Zhang4School of Energy and Power Engineering, Beihang University, Beijing 100191, ChinaSchool of Energy and Power Engineering, Beihang University, Beijing 100191, ChinaSchool of Aeronautic Science and Engineering, Beihang University, Beijing 100191, ChinaSchool of Reliability and Systems Engineering, Beihang University, Beijing 100191, ChinaSchool of Reliability and Systems Engineering, Beihang University, Beijing 100191, ChinaThe 7xxx-series aluminum alloys are widely used in aircrafts due to their superior performance. The evolution of the mechanical properties of the aluminum alloys caused by marine atmospheric corrosion has become a research hotspot due to the increase in aircraft service time in the marine atmospheric environment. In this work, the evolution of the mechanical properties of the 7B04-T74 aluminum alloy was studied by an alternate immersion test. The surface microstructure was analyzed by SEM, EDS, XRD, and OM. The influence of the marine atmospheric corrosion on mechanical properties was studied by tensile and fatigue tests. The results show that the 7B04-T74 aluminum alloy has good corrosion resistance, as only pitting corrosion occurs in the marine atmospheric environment. The tensile properties of the 7B04-T74 aluminum alloy remained fundamentally the same before and after corrosion. The fatigue properties of the 7B04-T74 aluminum alloy were severely reduced, but the localized pitting corrosion only affected the initiation stage of the crack and had little effect on the crack propagation process.https://www.mdpi.com/2075-4701/12/12/2173aluminum alloymarine atmospheric corrosionmechanical properties evolution
spellingShingle Ning Li
Xiaojun Yan
Xuerong Liu
Lu Han
Weifang Zhang
Mechanical Properties Evolution of the 7B04-T74 Aluminum Alloy in the Marine Atmosphere
Metals
aluminum alloy
marine atmospheric corrosion
mechanical properties evolution
title Mechanical Properties Evolution of the 7B04-T74 Aluminum Alloy in the Marine Atmosphere
title_full Mechanical Properties Evolution of the 7B04-T74 Aluminum Alloy in the Marine Atmosphere
title_fullStr Mechanical Properties Evolution of the 7B04-T74 Aluminum Alloy in the Marine Atmosphere
title_full_unstemmed Mechanical Properties Evolution of the 7B04-T74 Aluminum Alloy in the Marine Atmosphere
title_short Mechanical Properties Evolution of the 7B04-T74 Aluminum Alloy in the Marine Atmosphere
title_sort mechanical properties evolution of the 7b04 t74 aluminum alloy in the marine atmosphere
topic aluminum alloy
marine atmospheric corrosion
mechanical properties evolution
url https://www.mdpi.com/2075-4701/12/12/2173
work_keys_str_mv AT ningli mechanicalpropertiesevolutionofthe7b04t74aluminumalloyinthemarineatmosphere
AT xiaojunyan mechanicalpropertiesevolutionofthe7b04t74aluminumalloyinthemarineatmosphere
AT xuerongliu mechanicalpropertiesevolutionofthe7b04t74aluminumalloyinthemarineatmosphere
AT luhan mechanicalpropertiesevolutionofthe7b04t74aluminumalloyinthemarineatmosphere
AT weifangzhang mechanicalpropertiesevolutionofthe7b04t74aluminumalloyinthemarineatmosphere