An overview is provided of the need for research on the mechanisms of environmental-mechanical degradation of advanced aerospace alloys based on aluminum and lithium. Progress is reported on three tasks targeted at characterizing aqueous and gaseous environment corrosion fatigue crack propagation kinetics, microstructural paths and damage mechanisms for alloy 2090. A study is summarized with the goal of isolating and measuring localized processes which are hypothesized to control corrosion and embrittlement of aluminum-lithium alloys.
Progress Rept. 1 Apr-30 Nov 87
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