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a) If a nucleus forms with a radius less than critical radius for nucleation, it will disappear. Explain why?
b) Explain the free energy diagram; explain how the total free energy of the solid-liquid system changes
with the size of the solid.
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- At 660°C the fractional concentration of vacancies in aluminum is 9 × 10-5. The energy for vacancy formation is therefore: a. 0.72 eV b. 1.44 eV c. 0.79 eV d. 0.75 eV e. 0.68 eVQ3/ A- What are the important reactions in( Fe- C) system? B- Calculate the activation energy for vacancy formation in aluminum ,given that the equilibrium number of vacancies at 500°C is 7.57 x10 m.The atomic weight and density for aluminum are respectively, 26.98g /mol and 2.62 g/em.,Avogadros number ( 6.022x10 atoms/mol ), and Boltzmanns constant (8.62x10 ev /atom.K).?An alloy consisting of completely soluble cadmium (Cd) and zinc (Zn) in the liquid state, but neither of them dissolves in each other in the solid state. the table shown below shows the solidification temperatures for various alloys of cadmium and zinc. 1. Draw the equilibrium diagram according to the information given and data in the table and indicating all important temperature and phases. 2. Find the percentage of each phases and percentage of constituents of the alloy that contain 60 % Zn and at a temperature 300 °C. 3. Find the melting point for the following alloys 20 % Cd, 80% Cd 4. Draw the internal structure, noting the phases of the following alloys A) 30 % Cd at 290 °C b) 60 % Cd at room temperature. % of Zinc in alloy Start of solidification ("C) End of solidification ("C) 0 10 14 20 30 40 50 60 321 290 266 275 293 310 328 345 70 80 90 100 362 390 401 419 266 266 266 266 266 266 266 266 266 266 266 266
- Solubility limit is the (1) concentration of solute that may be added (2) the formation of a new phase. (1) = minimum, (2) = without. (1) = maximum, (2) = with. (1) = maximum, (2) = without. (1) = minimum, (2) = with.Calculate the number of vacancies per m3 for gold at 900 C. the energy for vacancy formation is 0.86 eV/atom.Copper (Cu) and silver (Ag) alloys form a binary alloy system that dissolves each othercompletely in the liquid state but only partially soluble in each other in the solid state.- The melting point of Cu is 1080 C and the melting point of Ag is 960 C.- At a temperature of 790 C, a eutectic reaction occurs in the 72% Ag alloy. At this temperature, Cucapable of dissolving 10% Ag and its eutectic microstructure is known to have a ratio of /β = 7/19 (findthe point of solubility of Cu in Ag at the eutectic temperature).- At room temperature (25 C), Cu metal can dissolve 5% Ag while Ag metal candissolve 2% Cu.a. Draw a phase diagram of the alloy system complete with the names of points, lines and phase regions.b. The 80%Ag alloy is cooled in equilibrium.i. Draw the cooling curve from liquid to solid state, complete withtemperature, the phases at each stage and the reactions that occur.ii. At the eutectic temperature (4a before and 4b after the eutectic reaction), determine the…
- Decarburization of a steel occurs when carbon diffuses from the steel to the surface and enters the atmosphere. How long will it take for a 0.6 % C steel surface to decarburize below 0.1 % C for a depth of 2 mm if the FCC steel is held at 1250 °C in an atmosphere containing zero carbon? I need this question's answer. It's important for me.For a Fe-2.5 %C alloy , what is the temperature at which the first liquid forms on heating and also give the composition of the liquid at that temperatureA student performing this lab experiment receives his unknown solution that may contain ( Ba, Ca, and Mg). And begins to conduct tests to identify 2+ 2+ 2+ the cations present in the unknown solution. Based on the following observation 1) When the unknown solution was treated with K,Cro4, no precipitate was formed. 2) The resulting solution from step 1 was basified with 6M NH, before the addition of aqueous K,C,0, which forms a white precipitate. 3) To the resulting solution from step 2, was treated with ammonia and of Na,HPO,· A white precipitate 4 was formed after heating the solution for 10 minutes at 60°C. Which cations were present in the student's unknown solution? Select one or more: 2+ Ва 2+ Mg 2+ Са
- 1. For some hypothetical metal the equilibrium number of vacancies at 750°C is 2.8×1024?−3. If the density and atomic weight of this metal are 5.60 ? ??3⁄ and 65.6 ?/???, respectively, calculate the fraction of vacancies for this metal at 750°C. 2. Calculate the number of vacancies per cubic meter in iron at 850°C. The energy for vacancy formation is 1.08 eV/atom. The density and atomic weight for Fe are 7.65 g/cm3 and 55.85 g/mol, respectively. Answer both pleaseDescribe the cooling of a peritectic alloy with the concentration CO and sketch the microstructure during solidification. T S+α 8 S S+B a+ß В сWhat is a eutectic composition?