Effects of Sc on microstructure and low-cycle fatigue properties of Al–Li alloy

The microstructures and low-cycle fatigue properties of Al–Li alloys with and without Sc addition were investigated. The results showed that the addition of Sc in Al–Li alloy can change its microstructure conspicuously, and improve its low-cycle fatigue properties. Sc addition to Al–Li alloy decreas...

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Veröffentlicht in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2008-06, Vol.483, p.448-451
Hauptverfasser:	Wang, Mingxing, Liu, Zhongxia, Liu, Zhiyong, Yang, Sheng, Weng, Yonggang, Song, Tianfu
Format:	Artikel
Sprache:	eng
Schlagworte:	Al–Li alloy Applied sciences Cross-disciplinary physics: materials science rheology Exact sciences and technology Fatigue Low-cycle fatigue Materials science Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology Metals. Metallurgy Microstructure Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Physics Precipitation
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Beschreibung
Zusammenfassung:	The microstructures and low-cycle fatigue properties of Al–Li alloys with and without Sc addition were investigated. The results showed that the addition of Sc in Al–Li alloy can change its microstructure conspicuously, and improve its low-cycle fatigue properties. Sc addition to Al–Li alloy decreases the growth rate of δ′ (Al 3Li) particles, and promotes the precipitation of the S′ (Al 2CuMg) phase. In addition, new strengthening phases, such as Al 3Sc, Al 3Li/Al 3Sc and Al 3Li/Al 3(Sc,Zr), also precipitate in Al–Li alloy with Sc addition, which is the main reason for the improvement of the low-cycle fatigue properties of Al–Li–Sc alloy.
ISSN:	0921-5093 1873-4936
DOI:	10.1016/j.msea.2006.09.165