Think that an alloy Cu-60wt%Ag is slowly cooled from the Liquid Phase Field. How many grams of total alpha are present at 778°C? The total alloy amount is 1000grams
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Think that an alloy Cu-60wt%Ag is slowly cooled from the Liquid Phase Field.
How many grams of total alpha are present at 778°C? The total alloy amount is 1000grams
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- 6.1) At the composition of 0.77% by weight C, identify the phase(s) presentat 950 degrees C 6.2) When the specimen is at 950 degrees C, what is the maximum C composition at which a single phase Austenite is stable?6.3) If we slowly cool a Fe-C alloy with 0.77% by weight C, austenitized at950 degrees C, to just below the eutectoid temperature of 727 degrees C, give the weight percentage and composition of the phases present based on the phase diagram given above6.4) If we cool very quickly a Fe-C alloy with 0.77% by weight C,austenitized at 950 degrees C, to room temperature, give the weight percentage and composition of the phase(s) presentMicrostructure of a steel contain 100% coarse pearlite it carbon content is reported to be 0.65% is it possible? And why ?10.11/ A 1.5-kg specimen of a 90 wt% Pb-10 wt% Sn alloy is heated to 250°C (480°F), at which temperature it is entirely an a-phase solid solution . The alloy is to be melted to the extent that 50% of the speci- men is liquid, the remainder being the a phase. This may be accomplished either by heating the alloy or changing its composi- tion while holding the temperature con- stant. (a) To what temperature must the speci- men be heated? (b) How much tin must be added to the 1.5-kg specimen at 250°C to achieve this state? 10.15) A magnesium-lead alloy of mass 5.5 ka consists of a solid a phase that has a compo- sition that is just slightly below the solubility limit at 200°C (390°F). (a) What mass of lead is in the alloy? (b) If the alloy is heated to 350°C (660°F). how much more lead may be dissolved in the a phase without exceeding the solubility limit of this phase? 10.27 A hypothetical A-B alloy of composition 55 wt% B-45 wt% A at some temperature is found to consist of mass…
- For a Copper-Nickel (Cu-Ni) alloy of composition 25 wt % Ni and 75 wt % Cu at 1200 OC (Point B), refer to the phase diagram provided in Figure 2 and answer the following. (i) What is composition of liquid phase? (ii) What is composition of solid phase? (iii) What fraction of the system is liquid for a 25% Ni alloy at 1250 OC? (iv) What fraction of the system is solid for a 25% Ni alloy at 1250 OC?JJ Techie calcined some ceramic powders at 1600℃ for 12 hrs, when removed from thefurnace, JJ was upset to find a big hard lump., After grinding up to the lump, someone told JJ to add a sintering aid and deflocculant to the ceramic before trying to press it into cylinders 10 inch by 0.25 inch in diameter. How could JJ do this well? JJ needs this size ceramic rod for experiments.The addition of dimethylglyoxime, H2C4H602N2, to a solution containing nickel(Il) ion gives rise to a precipitate: Nickel dimethylglyoxime is a bulky precipitate that is inconvenient to manipulate in amounts greater than 135 mg. The amount of nickel in a type of permanent-magnet alloy ranges between 22% and 38%. Calculate the sample size that should not be exceeded when analyzing these alloys for nickel.
- The given polymer X is composed of A (Mw: 1×104, 1 mole) and B (Mw: 1×105, 1 mole). Calculate Mn andMw of polymer X, respectively. Calculate the polydispersity index(d) By using the data provided below, calculate the PillingBedworth ratio for the nickel (Ni) – nickel oxide (NiO) system and determine whether NiO is protective against corrosion. Atomic mass of nickel = 58.7 g.mol-1 Density of nickel = 8.91 Mg.m-3 Molecular mass of nickel oxide = 74.7 g.mol-1 Density of nickel oxide = 6.67 Mg.m-3 (e) A stainless steel pressure vessel that has fracture toughness, K1C, of 197 MN.m-3/2 is going to be exposed to a stress of 398 MN.m-2 . By using this information explain how designers can determine the thickness of the vessel so that catastrophic failure can be avoided.A single crystal Ni (in FCC) alloy bar is uniaxially pulled along [-123]. The bar starts to yield at σ =100MPa by slipping on (111)[-101] which hence is the most favorable slip system.
- 2. (d) Describe three of the functions of the matrix in fibrereinforced composites. (e) With the aid of sketches compare and contrast the fatigue fracture appearance between an alloy that failed at a low fatigue load and one that failed at a high fatigue load. (f) Propose and briefly describe one non-destructive method that can be used to detect small cracks on the surface of a metallic alloy .A device to understand how iron behaves at high temperatureswe want to design. This device (with 1% accuracy) allows the change in volume (heating) of a 1cm 3 iron cube.the resulting polymorphic transformation) must be able to feel. HMK structure in iron 911 0 C and latticeparameter 0.2863 nm. At 913 0 C, it has YMK structure and its lattice parameter is 0.3591 nm. Of measuring instrumentDetermine the accuracy tolerance it needs (i.e. at least how many cm 3 to detect a changemust). It is necessary to use at least 6 digits after the comma in this question. Hint: YMK first andFor HMK, the volume of an atom is found and then, using the number of atoms in each structure, the ironThe question can be started by finding the different volumes.Please assist with the following sub questions of question 1. a) The conductivity of a 0.05M solution of acetic acid at 18⁰C is 4.4×10-4 (ohms)-1cm-1. Limiting molar conductivity of acetic acid at the same temperature is 387 (Ohms)-1cm². Calculate the dissociation constant (Ka) of acetic acid? b) The resistivity of aluminum is 2.824×10-8 ohms.m. Calculate the potential drop across a piece of aluminum wire that is 2.0 mm in diameter and 1.00 m long. Assume current is 1.25 A. C) Calculate the conductance and conductivity of a metal if the resistivity of the metal is 2.824×10-8 ohms.m, with resistance of 9.0×10-3 ohms when current is 1.25 A.