t a particular temperature of three phases of equilibrium compositions as follows: Liquid phase: 50 % A, 40 % B, 10 % C alfa solid solution: 85 % A, 10 % B, 5 % C beta solid solution: 10 % A, 20 % B, 70 % C a. Plot the composition of the alloy. b. Calculate the proportion by weight of liquid,  and  present in this alloy. c. For the same temperature, find the composition of the alloy which will consist of equal proportion of  and  phases of the compositions stated above, but with no liquid phase.

With the aid of sketches, explain the solidification of Fe-Al alloy from liquid to final microstructure present at room temperature. Determine the phase present, their individual composition, and the phase fraction at 250°C.

4. From a pyrite concentrate containing 65% by weight pyrite (FeS,) by total oxdizer roasting, the following Fe,03 is produced according to the reaction. 5 tons of pyrite concentrate is reasted daily (MA, g/ mol; Fe 56; S: 32; O: 16; H: 1). 2FES2+11/20, Fe,03 + 450, If it is desired to produce 95% sulfuric acid from the flue gases, how much sulfuric acid by volume is produced in 1 day? (d.atunk anste 95%: 1.84 g/ cm2)

A hypoeutectoid plain-carbon steel that was slow-cooled from the austenitic region to room temperature contains 9.1 wt% eutectoid ferrite. Assume that no change in structure on cooling from just below the eutectoid temperature to room temperature. Calculate the carbon content of the steel. Temperature ( 1000 900 7+ Fe,C 800 a+7 Eutectoid point 0.022 700 600 500- a+FqC 400 0 0.4 100% Fe 0.77 Pearlite Weight percent carbon Fe,C 6.67 1. Let x = the weight percent carbon of the hypoeutectoid steel (shown as a red line). Now, the relation (ratio) between the eutectoid ferrite to the total ferrite and the proeutectoid ferrite is expressed as: [Eutectoid Ferrite] = [Total Ferrite] - [Proeutectoid Ferrite) ... (eq.1) Fill eq.1 by using x. Express with up to 3 significant digits. (NOTE: Please check the rules for significant figures. For example, 0.012 and 1.23 both have 3 significant digits.) [Eutectoid Ferrite]-[1] [Total Ferrite]-[2] [Proeutectoid Ferrite]-[3] *Check the "Question Hint".…

If blast furnace slag is activated by NaOH, resulting in the formation of alkali-activated slag (AAS) – what kind of phases form in this system over time? How does the precipitated phase assemblage change with a change in the composition of the precursor slag? What differences exist in these formed phases in AAS systems when compared to blended systems such as OPC-Slag mixtures?

Composition (at% Ni) 20 40 60 80 100 1600 2800 1500 Liquid 1453°C 2600 1400 Solidus line Liquidus line 2400 1300 a +L B 1200 2200 1100 2000 1085°C 1000 20 40 60 80 100 (Cu) Composition (wt% Ni) (Ni) Figure Q3a Phase diagram of the Cu – Ni system. 327°C 300 Liquid 232C 200 41 183°C 18.3 61.9 97.8 •C 31 100 21 14 40 60 100 (PD) Composition (wt% Sn) (Sn) Figure Q3b Phase diagram of the Pb – Sn system. (3) aungeadue Temperature (°F)

The assumptions about the virtual process state diagrams of metals A and B similar to the lead-tin system in Figure 9.8 are as follows. (1)The α phase and β phase exist at both ends of A and B. (2) The process composition is 36 wt% A to 64 wt% B. (3) The composition of β phase at the process temperature is 88 wt% A to 12 wt% B. Find the composition of an alloy in which the weight fraction of invitation β and total β is 0.367 and 0.768, respectively.

Calculate the saturation indices of the solutions described below and classify each as undersaturated, supersaturated, or in equilibrium. Saturation state with respect to: Anhydrite (CaSO4) [Ca2+] = 0.00002 mM [SO42-] = 25 mM “Amakinite” (Fe(OH)2) [Fe2+] = 0.1 mM; [OH-] = 0.0001 mM Siderite (FeCO3) [Fe2+] = 3 mM; [CO32-] = 10 mM

The molar solubility (symbolized as "s") of CaF2 in water in terms of its Ksp is: SE = (Ksp)1/2 s = (Ksp)1/3 s = (Ksp/4)1/3 s = (Ksp/6)1/3 (Ksp/27)1/4 S=

A sample of feldspar weighing 1.500g is decomposed, and eventually there is obtained a mixture of KCl and NaCl weighing 0.1801 g. These chlorides are dissolved in H2O, a 50-mL pipetful of 0.08333 N AGNO3 is added, and the precipitate is filtered off. The filtrate requires 16.47 mL of 0.1000N KCNS, with ferric alum as indicator. Calculate the percentage of K2O in the silicate.