Low-temperature Mechanical Properties of Wrought Copper and Copper-base Alloys 



TABLE 1. — {Continued) 



295 



dthi 



sharp notch. 



-diameter commercial rod; yield strength 0.10 '3 



offset; single test — Izod impact resistance, 



" Charpy impact tests were made on a 10-sq. mm. specimen v 



* All test-s made on 0.25-in. -diameter specimens machined fron 

 ft.-lb., all samples unfractured. 



<= Tests made on 0.504-in. -diameter specimens, machined from 1-in. -diameter commercial rod. 



^ Tests made on 4.5-mm. (D.1755-in.) diameter specimens; yield point determined on Amsler recorder; elongation measured on 50-mm. (1.95-in.) gage length; 

 impact test values expressed as kilogram-meters per square centimeter on specimens (10 by 8 by 100 mm. having a 45-deg. sharp V notch) ; hardness — cone hardness 

 in kilograms per square millimeter with 120-deg. cone, load of 25 kg. applied for 5 min. 



« Yield point determined by drop of beam method. Elongation measured on 30-mm. (1.170-in.) gage length on specimen having a diameter of 3 mm. (0.117 in).. 



f Yield strength 0.20 To offset; elongation measured on 100-mm. (3.94-in.) gage length on specimen having a diameter of 20 mm. (0.788 in.). 



Elongation measured on 200-mm. (7.88-in.) gage length. 



fc Elongation measured on 20-mm. (0.788-in.) gage length oi 



• Elongation measured on a 150-mm. (5.85-in.) gage length 



1 Impact tests made by Battelle Institute in 1936 for American Bra 

 rod. 120 ft.-lb. Amsler machine used. Specimens tested in standard time of 5 sec. af 

 frozen in ether with liquid air and allowed to heat to testing temperature. All others 

 All Charpy specimens were unfractured. 



mm. (0.117 in.) by 5 mm. (0.195 in.) section, 

 specimen having a diameter of 5 mm. (0.195 in.). 



Brass Company. Standard Charpy specimens (keyhole) (notch) cut from 0.750-m. -diameter 

 removal from bath at stated temperature. Specimens at — 115°C. were 

 bath 15 min. at testing temperature. Figures are average of three tests. 



