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When the Al-Cu casting alloy A201 is aged, a plot of the tensile strength vs. the elongation to fracture follows a circular pattern. As alloy A201 is aged up to peak aging, the yield strength increases while the ductility decreases. The quality index is high and remains nearly constant. When overaged, the yield strength decrease and the strain hardening rate at low strains is very high. This limits the tensile strength and ductility, causing the quality index to fall.