Abstract
The very initial stage of local corrosion in composite Al7Cu2Fe/Al20Cu2Mn3 intermetallic particles (IMPs) was studied on a FIB site-specific specimen. It is confirmed by quasi in-situ TEM observation that the regions with long-range ordered (LRO) structure embedded in Al7Cu2Fe are the initial local corrosion sites. Besides, the de-alloying of LRO regions at Al7Cu2Fe/Al20Cu2Mn3 interface would highly increase the local potential difference and the galvanic driving force to trigger anodic dissolution of the Al20Cu2Mn3 phase. It provides new insights into the initiation and propagation mechanism of localized corrosion in composite IMPs.
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