COPPER

PROPERTY	@ 300K	UNITS	REFERENCES
Density	8.94	G/cm³	Cu1 Cu2 Cu3
Specific Heat	0.09118	Cal/g-K	Cu4 Cu5 Cu6
Thermal Conductivity	0.9508	Cal/cm-s-K	Cu7 Cu8 Cu9
Thermal Exp Coef	16.12x10^-6	1/K	Cu10 Cu11 Cu12
Melting Point	1356.6	K	Cu13
Resistivity	1.73x10^-6	Ohm-cm	Cu14 Cu15 Cu16
TCR (218K to 398K)	3930	Ppm/K	Cu14 Cu15 Cu16
Young’s Modulus	1.92x10⁷	psi	Cu17 Cu18 Cu19
Poisson’s Ratio	0.339	-----	Cu17 Cu18 Cu19
Yield Strength	10,000	psi	Cu20 Cu21 Cu22
Ult Tensile strength	32,000	psi	Cu20 Cu21 Cu22
Elongation at Break	51	%	Cu20 Cu21 Cu23
Hardness	37	Brinell	Cu21 Cu24 Cu25

Mechanical Properties listed are for fully annealed, bulk material. 95.6% cold work producing 0.083-inch diameter wire increases the strength to 90,000 psi. [Cu26] 88.7% reduction at 160C producing 0.025-inch diameter wire will reduce elongation to <5%. [Cu27] Polycrystalline copper thin films have a reported tensile strengths varying from 50,000 to 120,000 psi [Cu28] with one report as high as 140,000 psi and a corresponding strain at failure of 0.5% to 0.8%[Cu29]. Heating cold worked material to temperatures in the range 100 to 300C results in recovery and recrystallization erasing the effects of cold work. For more information on the effects of cold work, see graphs of mechanical properties -v- temperature

Engineering Materials

Revised: April 17, 2004