Fatigue and fracture behavior of aluminum-lithium alloys at ambient and cryogenic temperatures

The improved toughness of Al-Li alloys at cryogenic temperatures make them attractive for low temperature applications. This has lead to a study of the fatigue properties of these alloys at cryogenic temperatures and the influence of Zr on these properties. Two Al-Li alloys were studied: Al-1.88Li-2...

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Bibliographic Details
Published in:Scripta metallurgica et materialia 1995-07, Vol.33 (2), p.179-183
Main Authors: Xu, Y.B., Zhang, Y., Wang, Z.G., Hu, Z.Q.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Fractures
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
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Summary:The improved toughness of Al-Li alloys at cryogenic temperatures make them attractive for low temperature applications. This has lead to a study of the fatigue properties of these alloys at cryogenic temperatures and the influence of Zr on these properties. Two Al-Li alloys were studied: Al-1.88Li-2.85Cu-.22Mg-.02Zr and Al-2.30Li-2,88Cu-.23Mg-.17Zr. They were solution heat treated at 515 deg C, water quenched and aged 24h at 165 deg C. Fatigue tests were conducted at 300K and 77K. All fractures exhibited some IG failure. The data show that Zr increases the room temperature fatigue strength but the change in strength with increasing temperature is less than with non-Zr alloys. Also, Zr additions result in less IG failure than no Zr additions. The overall effect of Zr on fatigue properties is positive with respect to fracture mode and strength, both at room temperature and cryogenic temperatures.
ISSN:0956-716X
DOI:10.1016/0956-716X(95)00154-N