| CPC C22C 21/08 (2013.01) [H01R 13/03 (2013.01)] | 11 Claims |
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1. An aluminum alloy plate made of an aluminum alloy, the aluminum alloy containing
0.01 mass % or more and 1.50 mass % or less of silicon,
0.01 mass % or more and 2.00 mass % or less of magnesium,
0 mass % or more and 1.50 mass % or less of iron,
0 mass % or more and 1.50 mass % or less of copper,
0 mass % or more and 1.50 mass % or less of manganese,
0 mass % or more and 1.50 mass % or less of chromium,
0 mass % or more and 1.50 mass % or less of zinc,
0 mass % or more and 1.50 mass % or less of zirconium, and
0 mass % or more and 1.50 mass % or less of titanium,
with the balance being aluminum and inevitable impurities, wherein
the aluminum alloy in a cross-section of a surface layer region of the aluminum alloy plate contains a plurality of compounds, each of the plurality of compounds containing one or more elements selected from the group consisting of silicon, magnesium, iron, copper, manganese, chromium, zinc, zirconium, and titanium, and aluminum,
the surface layer region is up to 200 μm from a surface of the aluminum alloy toward an inside of the aluminum alloy,
a number of fields of view containing the plurality of compounds having an equivalent circle diameter of 5 μm or more out of ten fields of view extracted from the cross-section is 3 or less,
a size of each of the ten fields of view is 50 μm×100 μm,
a number density of each of the plurality of compounds having an equivalent circle diameter of 1.5 μm or more and less than 5.0 μm is 0.0010 per μm2 or less, and
an area ratio of the plurality of compounds having an equivalent circle diameter of 0.5 μm or more is 0.1% or more and less than 1.0%.
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