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isa:355119343
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In the present invention, the alloy used to cast the inner layer may be a metal having a high coefficient of contraction, for example, a high-Mg or high-Zn aluminum alloy, e.g. an aluminum alloy containing at least 2.5 wt. % Mg, more preferably 2.5 to 15 wt. %, more preferably 2.5 to 9 wt. %, and even more preferably 2.5 to 7 wt. % Mg.
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n5:au
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isap:227412945
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isa:355119343