Alloys phase diagrams

In previous sections we have shown how the structures of elemental materials may be rationalized on the basis of microscopic considerations. Our idea was to build up the free energy of a discrete set of competitors and then to make a free energy comparison between these competitors as a function of temperature and perhaps pressure. We next turn to the analysis of alloy phase diagrams. Here we will have to expand the scope of our previous analysis in order to account for the fact that the presence of more than one chemical constituent will at the very least alter the configurational and vibrational entropy. We define alloy in the present context to include any system in which there is more than one 

---

P. Braun. Surf. Sci. 126,714,1983. VEELS study of bulk and surface plasmon energies across Al—Mg alloy phase diagram. 

Binary Alloy Phase Diagrams, 2nd edition, editor-in-chief T. B. Massalski, ASM International, Materials Park, Ohio, (1990). 

ASM Handbook, Vol. 3, Alloy Phase Diagram (ASM International, Materials Park Ohia 1992). 

Figure 2. The connected schematic binary alloy phase diagrams for the light actinides. The diagrams for Ac through U and for AmCm are estimates based upon the pure elements.

Massalski, T.B., Murray, J.L., Bennett, L.H., and Baker, H. (1986) Binary Alloy Phase Diagrams, American Society for Metals, Metals Park, OH, p. 1807. 

Villars, P., Prince, A. and Okamoto, H. (eds.) (1995) Handbook of Ternary Alloy Phase Diagrams (ASM International, Materials Park, OH, USA), Vols. 1-10. 

More complex situations were shown in Figs. 2.26 and 2.27, where some typical examples of isobarothermal sections of ternary alloy phase diagrams were presented. In the case of ternary systems, several binary and ternary stoichiometric (Fig. 2.28) phases and/or different types of variable composition phases (Fig. 2.29) may be found. We may differentiate between these phases by using terms such as point compounds (or point phases, that is, phases represented in the composition triangle, or more generally in the composition simplex by points), Tine phases , field phases , etc. 

D.S. Evans and A. Prince, Ga-In-Sn Phase Diagram, ASM Alloy Phase Diagrams Center, P. Villars, editor-in-chief H. Okamoto and K. Cenzual, section editors www.asminternational.org/AsmEnterprise/APD, ASM International, Materials Park, OH, 2006... 

---