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Fatigue, Fracture Mechanics and Corrosion Properties of Some Aluminum-Lithium Alloys,

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A research programme for the evaluation of the main characteristics of the newly developed Al-Li alloys has been undertaken under the sponsorship of the Italian National Research Council C.N.R.. Many italian aeronautical Industries and Research Institutes take part in this programme, which comprises a large variety of experimental activities static tests, fatigue tests, crack propagation tests, fracture toughness, corrosion susceptibility, formability, workability and other tests. Different producers British Alcan, Cegedur Pechiney and Alcoa provided the alloys tested in this programme 2091, 8090 and 2090 alloys have been objects of investigation. The paper describes some of the results obtained so far in the C.N.R. programme and some results obtained by Aeritalia in its own programs. The results are relevant to fatigue tests carried out both on notched and unnotched specimens, under Constant Amplitude loading R0.1. Fatigue tests, together with structural Transmission Electron Microscopy and fractographic Scanning Electron Microscope studies, have been carried out also for assessing the influence of different ageing on both mechanical properties and failure modes of materials. Crack propagation tests were carried out under both C.A. loading and FALSTAFF sequence and are here presented, together with results from fracture toughness tests. Keywords Alloys, Metallurgy, Italy, FatigueMechanics, FractureMechanics, Corrosion, Sodium sulfate, NA2S04, ASTMG69 Standard. JG

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  • Properties of Metals and Alloys

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