Effect of chloride environment on fatigue behavior of AA6061-Al{sub 2}O{sub 3} particle composite
- Politecnico di Milano (Italy). Dipt. di Chimica Fisica Applicata
The paper deals with the corrosion fatigue behavior of a particulate reinforced metal matrix composite with aluminium alloy AA 6061-T6 matrix and 10% by volume of alumina particles. The material was in two different working conditions. Fatigue K-increasing and K-decreasing crack growth rate tests were carried out in air and a 3.5% NaCl aqueous solution. The condition of pitting corrosion initiation in chloride environments was studied by means of potentiodynamic polarization tests carried out in aerated and deaerated 3.5% NaCl solutions. Furthermore immersion tests were performed in aerated solutions. The aggressive environment significantly increased the fatigue crack growth rate for a given {Delta}K, with respect to tests in air. The sensitivity of the fatigue behavior to the chloride solution was different in the two materials, whereas the corrosion behavior was similar. Thereafter an interaction between pitting corrosion, occurring preferentially at the particle-matrix interface, and the mechanisms of crack propagation in the composite material was argued.
- OSTI ID:
- 352603
- Report Number(s):
- CONF-980316--
- Country of Publication:
- United States
- Language:
- English
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