What is the general form of a eutectic reaction?
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What is the general form of a eutectic reaction?
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- Define eutectic, eutectoid and peritectic reactions with the examplesA. What is the maximum solid solubility of Cu in Ag? At what temperature? Write the Ag-Cu eutectic reaction, indicating the reactant and product phase(s), and the temperature and the composition (as wt% Cu) at which the reaction takes place.What is a eutectic composition?
- What is degree of reaction? Give expressions of reaction rate equations by degree of reaction.3. (a) What is hot shortness? How does it affect the temperature at which eutectic alloys can be used? (b) An intermetallic compound is found for 38 wt.% Sn in the Cu-Sn phase diagram. Determine the formula for the compound. (c) What is an invariant reaction? Show that of for a two-component system the number degrees of freedom for an invariant reaction is zero.The melting point of a adamantiumis 740°C, the associated heat of fusion is 12kJ/mol, and the heat capacities of the solid andliquid phases are 30.2 and 37.8J K−1mol−1,respectively. (a) Calculate the change in molarentropy of adamantium that is heated from 700°Cto 800°C. (b) What is the change in the molarenthalpy
- Consider the magnesium oxide-aluminum oxide phase diagram; ss indicates a solid solution. The radii of Mg2 + and Al3 + are 0.072 and 0.053 nm, respectively. (a) There are two eutectic reactions on the diagram; describe them (temperatures, compositions and phases). (b) Spinel, at temperatures below 1000 °C, is a compound with a composition of 50 mol% Al2O3-50 mol% MgO. For higher temperatures, spinel is stable for a range of compositions. What is the temperature of the congruent fusion? (c) What are the main reasons for the low solubility of Al2O3 in MgO below 1400 °C? (d) Maximum non-stoichiometry on the Al2O3-rich side, in the spinel phase field, occurs approximately 2000 °C and corresponds to approximately 82 mol% (92% w) of Al2O3. Determine the type of gaps defect that is produced and the percentage of gaps that exists in this composition.For a 60-40 Pb-Sn alloy, what would the percent of each phase be at 185°C and 180°C?What are they and what is their application in the production of the following steel: TTT diagrams. Steel Concentration Eutectoid