£ 50- 



^^ 1 



1 



Powder Specifications 



1 





(1) As-produced particle size 



(2) S atomic % iron 



1 1 



5 



10 



IS 20 



25 



30 



Milling Time (min) 

 (a) Reaction efficiency versus milling time. 



Time (min) 

 (b) Percent completion versus time. 



Figure 14. Reaction efficiency as function of milling time. 



31 



fc*K-Afi<jwU.';i«i^ t Jii 1 ;^s.^ . , 



HMttta ■■■v-.t'.j..-..^,-:-,,-,-. 



*uji 



