High-cycle fatigue strength of ultrafine-grained 5483 Al-Mg alloy at low and elevated temperature in comparison to conventional coarse-grained Al alloys
Kamil Majchrowicz , Zbigniew Pakieła , Maciej Giżyński , Maciej Karny , Mariusz Kulczyk
AbstractThis paper presents fatigue behavior of ultrafine-grained (UFG) 5483 Al-Mg alloy processed by hydroextrusion in comparison to its coarse-grained counterpart (CG 5483) and precipitation strengthened CG 7475 alloy. The specimens were tested at low (-50˚C), ambient (25˚C) and elevated (100˚C) temperature in tension-tension (R = 0.1) fatigue under stress control. It was found that the decrease of temperatures leads to a shift of Wöhler curves to higher stress values. Despite of similar YS, UFG 5483 alloy exhibited reduced fatigue strength compared with CG 7475 alloy. The changes in fatigue life were rationalized in terms of lower stability of UFG structure under cyclic loading. UFG 5483 and CG 7475 alloys were susceptible to cyclic softening attributed to fatigue-induced recovery process, whereas CG 5483 exhibited cyclic hardening accompanied by dislocation density increase.
|Journal series||International Journal of Fatigue, ISSN 0142-1123, (A 35 pkt)|
|Publication size in sheets||0.5|
|Keywords in Polish||Materiały ultradrobnoziarniste; Stopy aluminium; Zmęczenie; Wpływ temperatury; Stabilność cykliczna|
|Keywords in English||Ultrafine-grained materials; Aluminum alloys; Fatigue; Temperature effect; Cyclic stability|
|ASJC Classification||; ; ; ;|
|Score|| = 35.0, ArticleFromJournal|
= 40.0, ArticleFromJournal
|Publication indicators||: 2017 = 1.997; : 2017 = 3.132 (2) - 2017=3.25 (5)|
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