84 



BELL SYSTEM TECHNICAL JOURNAL 



PRECIPITATION HARDENED FC-Ni-Al 



ANNEALED PERMALLOY 



HARD-ROLLED PERMALLOY 



Fig. 20 — The width of X-ray reflections indicates the amount of internal strain. 

 Ordinates, intensity of X-rays reflected from metal surface; abscissas, angle of 

 reflection. 



COMPOSITION 



Fig. 21- 



-Precipitation hardening of an alloy for a permanent magnet, such as an 

 alloy of iron, nickel, and aluminum. 



