question unless otherwise indicated) Circle the one BEST answer unless otherwise
ID: 533984 • Letter: Q
Question
question unless otherwise indicated) Circle the one BEST answer unless otherwise required. 1.What is a Tie line? Page a. It is a horizontal ine a two phase region which connects the liquidus and solidus at a temperature of is interest. a horizontal temperature of line which represents the maximum solubility of one material in another at a interest. a It is a vertical line which indicates the start ofthe solidification process of a phase. d. It is a vertical line which indicates the finish of the solidification process of phase. 2. Grain growth causes metals to become: a. Harder b. Softer c, More brittle d. Strong 3. The Lever rule can be used to determine: (2 marks) a. The composition of two phases in equilibrium. b. The temperatures at which phase changes occur. c. The relative masses of two phases present at equilibrium. d. The solubility of the phases in equilibrium. 4. One of the essential property of eutectics is that they: a. Have a low melting point relative to its constituent metals b. Have a high melting point relative to its constituent metals c. Freeze over a wide range of temperatures. d. Finish liquid-solid phase transfomation instantly. 5. Eutectic and Eutectoid consist of: a. Equiaxed grains of two different phases b. Coarse grains of two different phases c. Alternating layers of two different phases d. Grains of two different phases in any arrangement 6. What is the effect of cold working on the dislocation density in metals: a. The dislocation density stays the same. b. The dislocation density increases. c. The dislocation density decreases. d. None of the above.Explanation / Answer
(1)
Tie line is a horizontal line in a two phase region connecting the liquidus and solidus points at a particular temperature. The ends of tie line tells about the composition of the two phases which occur at equilibrium.
(2)
Grain growth causes the metal to become softer, because the coarsening of the grains causes the metal to lose its strength substantially.
(3)
The lever rule is used to determine the composition of two phases in equilibrium. It determines the % weight of the solid and the liquid phase for a binary composition.
(4)
Eutectic mixture has a lower melting point relative to any of its constituents.
Eutectic temperature is the lowest melting temperature over all the possible mixing ratios of the mixture components.
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