(a) As explained in Sec. 10.10, a ternary alloy may have a ternary eutectic point, at which four phases may coexist. Describe the nature of these four phases. How many degrees of freedom are there when the four phases coexist in a ternary alloy?    What is the meaning of this?

(b) A ternary alloy may also have a three?phase field. How many degrees of freedom will there be in the three?phase field? Explain the significance of this number of degrees of freedom.
(c) In a ternary alloy a single?phase field may also occur. How many degrees of freedom will it contain?


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