Question

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1A)

1b)

1C

Describe what happens if an alloy with the eutectic composition is cooled from just above to just below the eutectic temperature What is the solubility of tin in lead at 160 degrees C? Select one: 0 a. 1 2 at% b. 18.3 at% c, 20 at% O d. zero Which of the following is true for a mixture of elements in a solid? Select one: a. A mixture of elements forming a solid is always two phases b. A mixture of elements forming a solid is always a single phase c. A mixture of elements forming a solid can be one phase or multiple phases d. A mixture of elements forming a solid is always multiple phases

Answer 1

1A) The eutectic composition is the lowest temperature point on which the composition will be in equilibrium of their solid phase and liquid phase. Or it can be said that at this temperature both the components will melt at same temperature. If this composition is cooled from just above to just below the eutectic temperature then the homogeneous liquid phase converts into eutectic solid phase or homogeneous solid phase of the composition.

1b) If we see the phase diagram of tin-lead system it is clear that at 160 degree celcius two phases are in equilibrium and percentage of tin is around 18.3 %.

1C) option c is correct mixture of elements in a solid can be one phase or multiple phase depending on temperature, composition and nature of the components.