Canonical generation free energy of the material null

摘要

PROBLEM TO BE SOLVED: To make press blanking properties of the stock for an electronic component satisfactory while maintaining its excellent copper alloy stock characteristics for an electronic component.;SOLUTION: A Cu alloy comprising 0.1 to 5.0 mass% of one or more kinds of metals in which the standard formation free energy of carbide is ≤-42 kJ/mol (≥42 kJ/mol in absolute value), and in which the diameter of the equivalent circle of the crystal grains in the cross-section parallel to the rolling direction is 0.5 to 30 μm on the average value, and the average value of an aspect ratio as the ratio between the width and length in the crystal grains is ≥1/5 is coated with Cu at a thickness of 0.05 to 2.00 μm.;COPYRIGHT: (C)2005,JPO&NCIPI