222 



JV. L. Bowen — The Ternary System ; 



area LNM all liquid 



ALKN liquid L to N and solid solution A to K. 



MNC liquid M to N and solid C. 



KNC liquid N, solid solution K, and solid C. 



KCB solid C and solid solution K to B. 



At a higher temperature T,° for which L^M, is the iso- 

 therm the relations are indicated by the dotted lines : 



areaAL l N 1 M 1 all liquid 



L 1 N 1 K 1 liquid N l to L t and solid solution P-K x 

 MjNjC liquid M 1 to N x and solid C 

 K^NjC liquid N x , solid solution K, and solid C 

 K^CB solid C and solid solution K A to B. 



The lines crossing the fields ALNK for the temperature T°, 

 and L 1 K 1 ISr i for the temperature T,° join the composition of a 

 liquid with that of the solid solution which is in equilibrium 

 with it. Thus at T° a mixture of total composition x consists 

 of solid solution R and liquid S, and a mixture of total com- 

 position cCj consists of liquid L x and solid solution P, a relation 

 which is shown in the binary system in fig. 8. 



The lines KN, K^N,, RS, etc., might be referred to as solid- 

 phase -indicating lines since they indicate the composition of 

 the solid-phase which is in equilibrium with various liquids. 

 KN and K l N i are special cases of solid-phase-indicating lines 

 since they are also the boundaries of the three-phase field. It 

 will be necessary to refer to lines of this type in general terms 

 later and the name three-phase-boundaries will be used. 



, 



