www www 8.24 - A lead-tin (Pb-Sn) alloy consists of 60 wt % proeutectic ẞ and 60 wt % eutectic a + ẞ at 180°C - AT. Calculate the average composition of this alloy. (see Fig. 8.12 below) Copyright © The McGraw Hil Companies, Inc. Pession required for reproduction or delay Procutectic a 24% 100% Liquid Eutectic a Liquid 76% Eutectic B Alloy 2 Alloy 1 Liquid 327 Solidus = 49% Liquidas 300 Liquid Liquidus 250 a + liquid Procutectic a -51% Temperature (C) 200 183 150 Procutectic or 100 18 50 Solvus 19.2 40.0 Solidus B+ liquid B Solvus Eutectic point a+B 61.9 97.5 0 10 20 30 40 50 60 70 80 90 100% 100% Weight percent tin Sn Pb Eutectic B Eutectic a Fig. 8.12

5. Consider the phase diagram of Cu-Be shown below. At 1000°C with an overall alloy composition of 1 wt% Be, determine the: (a) Phase present, (b) phase compositions, (c) relative amount of each phase, and (d) amount of solid (in grams) that forms in 50 g of the alloy. Include your tie line in the solution. Composition (at% Be) 5 10 15 20 Liquid 1000 7+ 866°C 800 a + Y1 -620°C 600 a + Y2 400 1 4 (Cu) Composition (wt% Be) Temperature (°C)

Copper-rich copper-beryllium alloys are precipitation hardenable. After consulting the portion of the phase diagram shown in Figure below, do the following: Composition (at% Be) 10 15 20 1000 Liquid 866°C 800 -620°C 600 a+ 12 400 (Cu) Composition (wt% Be) (i) Indicate the range of compositions over which these alloys be precipitation hardened. (ii) Describe the heat-treatment procedures (in terms of temperatures) that would be used to precipitation harden an alloy having a composition of your choosing but lying within the range given for part (i). Temper ature ("C

20212 -202 A blast furnace makes pig iron containing 3.2% and 1.8% of Carbon and Silicon and remaining as Iron respectively. The ore is a combination of 80%, 12% and 8% of Iron Oxide, Silica and Aluminum Oxide respectively. The process requires coke at a rate of 1 Kg per kg of pig iron produced. The coke is adulterated with Silica with 10% of silica and remaining to be carbon. The flux is obtained at a rate of 0.4 kg per kg of pig iron and is the base of one tonne of pig iron containing pure Calcium carbonate. The blast furnace gas has 30% CO and 15% CO2. calculate the following assuming the 1. The weight of core used. 2. The weight of slag made. m504ssary data required: [15] 504-888/7/2024/04/28-202nsidering t 3. The volume of the blast-furnace gas. 4/28-202123am504-88817-20 Produced,2 88817-2024/04