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Field ion microscope images have been used to measure the local evaporation field of a Al 3 Zr particle in 7050 Al alloy. Using the matrix Al evaporation field (19V/nm) as a reference, the evaporation field of Al 3 Zr has been estimated to be 36V/nm, similar to the theoretical value for the field evaporation of Al 2+ or Zr 3+ ions. A strong local magnification effect...
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