149 



TABLE 143.— COEFFICIENTS OF LINEAR THERMAL EXPANSION OF 



SOME ALLOYS* 



Coefficient t 



Temperature of linear 



or tempera- thermal ex- 



ture range pansion X 10® 



Alloy t °C per °C Authority 



Aluminum-beryllium, 4.2 to 32.7 Be 20 to 100 22.4 to 17.8 1 ** 



20 to 500 26.6 to 22.2 



Aluminum-copper, 9.9 Cu 20 to 100 22.0 2 



20 to 300 23.8 



33.2 Cu 20 to 100 19.7 



20 to 300 20.8 



Aluminum-nickel, 3.4 Ni 20 to 100 21.9 2 



20 to 300 23.7 



19.5 Ni 20 to 100 18.2 



20 to 300 19.5 



Aluminum-silicon, 4.2 to 12.6 Si 20 to 100 22.2 to 19.4 3, 2 



20 to 300 24.8 to 22.1 



19.7 Si 20 to 100 18.5 



20 to 300 19.0 



40 Si 20 to 100 14.7 



20 to 300 17.1 



Aluminum-zinc, to 50 Zn 20 to 100 23.6 to 26.5 4 



Brass, 3 to 40 Zn 25 to 100 16.9 to 19.7 5 



25 to 300 17.7 to 21.2 



Bronze, 4.2 to 10.1 Sn 25 to 100 17.1 to 17.8 5 



25 to 300 17.8 to 19.0 



Cast iron 20 to 100 8.7 to 11.1 6 



20 to 400 11.5 to 12.7 



Cobalt-iron-chromium, 53.0 to 55.5 Co, 35.0 



to 37.5 Fe, 9.0 to 10.5 Cr 20 to 60 —1.1 to +1.7 7 



Copper-beryllium, 3.0 Cu 20tol00 15.9tol7.3 8 



20 to 300 16.4 to 17.4 



Copper-nickel, 19.5 Ni —182 to 13.0 9 



to 40 14.7 



49.8 Ni —182 to 11.8 



to 40 13.7 



Copper-tin (see Bronze) 



Copper-zinc (see Brass) 



Dumet : 



Axial 20 to 300 6.1 to 6.8 10 



Radial 20 to 300 8.0 to 10.0 



Duralumin 20 to 100 21.9 to 23.8 3 



20 to 500 25.4 to 27.6 



Fernico, 54 Fe, 31 Ni, 15 Co 25 to 300 5.0 11 



Invar, 64 Fe, 36 Ni to 100 to 2 12 



Jron-aluminum, .5 to 10.5 Al 20 to 100 11.6 to 12.2 13 



Iron-chromium, 1 to 40 Cr 20 to 100 12.4 to 9.4 12 



* Compiled by Peter Hidnert and H. S. Krider, National Bureau of Standards. 



t Chemical composition is given in percent by weight. t Coefficient of expansion varies with com- 



position and treatment. ** Numbers refer to authorities given at end of table. 



(continued) 



SMITHSONIAN PHYSICAL TABLES 



