NICKEL

PROPERTY	@ 300K	UNITS	REFERENCES
Density	8.90	G/cm³	Ni1 Ni2 Ni3
Specific Heat	0.107	Cal/g-K	Ni4 Ni5 Ni6
Thermal Conductivity	0.216	Cal/cm-s-K	Ni7 Ni8 Ni9
Thermal Exp Coef	13.5	1/K	Ni10 Ni11 Ni12
Melting Point	1726	K	Ni13
Resistivity	7.16x10^-6	Ohm-cm	Ni14 Ni15 Ni16
TCR (218K to 398K)	5550	Ppm/K	Ni14 Ni15 Ni16
Young’s Modulus 1	3.20x10⁷	psi	Ni17 Ni18 Ni19
Poisson’s Ratio 1	0.299	-----	Ni18 Ni18 Ni20
Yield Strength	8500	psi	Ni21 Ni22 Ni23
Ult Tensile strength	46,000	psi	Ni21 Ni22 Ni23
Elongation at Break	50	%	Ni21 Ni23 Ni24
Hardness	40 B	Brinell	Ni24 Ni25 Ni26

1: The elastic constants of Ni depend on magnetization as well as temperature. Young’s modulus of demagnetized Ni is 19.5% smaller than the modulus of saturated material. At room temperature the difference is about 7%. [Ni 27]

Mechanical properties listed are for fully annealed, bulk material. Cold work will dramatically increase the strength and hardness and reduce the elongation. By suitable choice of hot rolling and cold drawing tensile strengths ranging from 65,000 to 115,000 psi can be achieved for commercially pure Ni (99.85%) in rods and bars, as high as 130 psi in strip and 160,000 psi in wire. [Ni23] Tensile strengths in greater than 300,000 psi with 1.8% elongation have been reported for poly crystalline Ni films. [Ni 28] Heating cold worked material into the temperature range 300-500C will result in recovery and recrystallization erasing the effects of cold work. For more information on the effects of cold work on mechanical properties, see graphs of Mechanical properties-v-temperature.

Engineering Materials

Revised: April 17, 2004