e) Each time one monomer is attached, another water Each time one monomer is att

ID: 705002 • Letter: E

Question

e) Each time one monomer is attached, another water Each time one monomer is attached, two water molecules are released (c) Each time one monomer is attached, no water molecule is released (d) None of the above 40. In an eutectic phase diagram for metals A and B, assume eutectic composition is 58 wt% B. The composition of the ? phase at the eutectic temperature is 96,4 wda B. if mass fractions of primary a and total a are respectively given 0.42 and 0.82. The composition of alloy is: . - tax (a) 46.6 wt% 03 082 (b) 60.5 wt% (c) 40.6 wt% B-L CI

Explanation / Answer

Very few systems exhibit an isomorphous phase diagram. Often the solid solubility is severely limited, though the solid solubility is never zero. In a simple eutectic system, there is one composition at which the liquid freezes to 2 solids at a single temperature. The alloy of eutectic composition freezes at a lower temperature than the melting points of the constituent components.

The eutectic reaction is given by,

L <-> alpha + beta

Typically, in eutectic systems, the solid solubility increases with temperature till the eutectic point.

Phase diagrams usually do not correspond to the global energy minimum, hence often microstructures are tolerated in phase diagrams. They give information on stable phases expected for a given set of thermodynamic parameters. Phase diagrams are an important tool in the armory of a materials scientist. This phase diagram demarcates regions of existence of various phases.

Broadly 2 kinds of phase diagrams can be differentiated, those involving time and those which do not involve time. There are 2 sub-classified types of phase diagrams not involving time. They are

1. with composition as a variable (T vs %Cu)

2. without composition as a variable (P vs T)

The above one given is a phase diagram not involving time with the composition as a variable.

The fraction of alpha is given by,

-> 0.82 = (96.4 - 58) / (96.4 - x)

Therefore, x = 49.57073171

as the alpha and the liquid makeup 100% of the alloy's composition:

%liquid = 100 - 49.57

= 50.42%

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e) Each time one monomer is attached, another water Each time one monomer is att

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