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Open AccessArticle

The Effect of Creep Aging on the Fatigue Fracture Behavior of 2524 Aluminum Alloy

1
Light Metal Research Institute, Central South University, Changsha 410083, China
2
National Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Nong Gao
Metals 2016, 6(9), 215; https://doi.org/10.3390/met6090215
Received: 26 July 2016 / Revised: 23 August 2016 / Accepted: 31 August 2016 / Published: 7 September 2016
(This article belongs to the Special Issue Aluminum Alloys)
Normal temperature tensile and fatigue tests were adopted to test the mechanical performance and fatigue life of 2524 aluminum alloy under the three states of T3, artificial aging, and creep aging, and scanning electron microscope and transmission electron microscope were also used to observe the fatigue fracture morphology and aging precipitation features of the alloy under the above three states. Results showed that the alloy treated by creep aging can obtain higher fatigue life, but that treated by artificial aging is lower than T3; T3 alloy is mainly dominated by GPB region. Meanwhile, the crystal boundary displays continuously distributed fine precipitated phases; after artificial aging and creep aging treatment, a large amount of needle-shaped S′ phases precipitate inside the alloy, while there are wide precipitated phases at the crystal boundary. Wide precipitation free zones appear at the crystal boundary of artificial-aging samples, but precipitation free zones at the alloy crystal boundary of creep aging become narrower and even disappear. It can be seen that creep aging can change the precipitation features of the alloy and improve its fatigue life. View Full-Text
Keywords: 2524 aluminum alloy; creep aging; fatigue fracture behavior; aging precipitation 2524 aluminum alloy; creep aging; fatigue fracture behavior; aging precipitation
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MDPI and ACS Style

Li, W.; Zhan, L.; Liu, L.; Xu, Y. The Effect of Creep Aging on the Fatigue Fracture Behavior of 2524 Aluminum Alloy. Metals 2016, 6, 215.

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