256 



Copper and Copper-base Alloys 



800 900 1000 1100 1200 1300 1400 



Annealing Temp.in Deg.F (IHr. at Temp.) 



Chart 5. — The effect of annealing on the grain-growing charac- 

 teristics of 5 per cent aluminum-bronze rod, previously cold-drawn 

 50 per cent (reduction of area) from material having a grain size of 

 0.025 mm. (95.19 % copper, 4.66 % aluminum) (rod under 1 in. in 

 diameter) . 



^110 

 o 



Sioo 



g 90 



_i 



^80 



o 



^70 



§ 60 



2: 50 



w 

 w 40 



75 



30 



X 



^ 20 



y 10 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp.in Deg. F. (1 Hr.a+ Temp.) 



Chart 6. — The effect of annealing on the Rockwell hardness, per- 

 centage elongation in 2 in,, and percentage reduction of area of 5 per 

 cent aluminum-bronze rod, previously cold-drawn 50 per cent (reduc- 

 tion of area) from material having a grain size of 0.025 mm. (95.19 % 

 copper, 4.66% aluminum) (rod under 1 in. in diameter). 



100 

 90 



^ 70 



I. 

 <u 

 °- 60 



XI 



§ 50 

 o 



X- 40 



■+- 



c 30 

 1- 

 >^ 20 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp.in Deg.FflHr.at Temp.) 



Chart 7. — The effect of annealing on the yield strength of 5 per cent 

 aluminum-bronze rod, previously cold-drawn 50 per cent (reduction 

 of area) from material having a grain size of 0.025 mm. (95.19 % copper, 

 4.66 % aluminum) (rod under 1 in. in diameter). 



CD 500 600 700 800 900 1000 1100 1200 1300 1400 

 Annealing Temp.in Deg.F f IHr a+ Temp.) 



Chart 8. — The effect of annealing on the tensile strength and 

 apparent elastic limit of 5 per cent aluminum-bronze condenser tube, 

 previously cold-drawn 20 per cent (reduction of area) (94.62 % copper, 

 4.69 % aluminum). 



