This paper addresses the issue of environmentally-assisted fatigue crack propagation in metallic and intermetallic alloys, which is essential to predict the durability of aerospace components. A review of the current understanding of the mechanisms accounting for the detrimental effect of air on fatigue crack growth resistance of conventional alloys is first presented. The adequacy of the two sequential processes identified, namely water vapour adsorption on crack tip surfaces and hydrogen embrittlement of cyclically deformed material within the plastic zone, to account for environmentally-assisted fatigue crack propagation in alloys based on intermetallic compounds is then examined. The last section is devoted to the analysis of environmental effects during creep-fatigue crack growth in an age-hardened aluminium alloy for supersonic aircraft. In particular the influence of environment on the intergranular cavitation damage process is analysed.
Environmentally-assisted fatigue crack growth mechanisms in advanced materials for aerospace applications
Umweltbedingte Einflüsse auf den Verlauf des Ermüdungsrisswachstums in neuartigen Materialien für Anwendungen in der Luft- und Raumfahrt
International Journal of Fatigue ; 29 , 9-11 ; 1927-1940
2007
14 Seiten, 69 Quellen
Article (Journal)
English
Adsorption , Aluminiumlegierung , Anwendung in der Luft- und Raumfahrt , dispersionsgehärtete Legierung , Ermüdungsrisswachstum , Hohlraumbildung , intermetallische Verbindung , Kaltaushärten , Kavitation , Oberflächenreaktion , plastische Verformung , Raumfahrttechnik , Rissspitze , Übersichtsdarstellung , Umgebungsbedingung , Umweltbeeinflussung , Wasserstoffversprödung , Werkstoffwissenschaft
Environmentally Assisted Cracking in Advanced Aerospace Aluminums
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