ENME382 S2010 0201 ch10 part2

ENME382 S2010 0201 ch10 part2 - 2 components has a special...

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Unformatted text preview: 2 components has a special composition with a min. melting T . Binary-Eutectic Systems • 3 single phase regions ( L , α , β ) • Limited solubility: Ex.: Cu-Ag system Cu-Ag system L (liquid) α L + α β 1200 T (°C) 00 1000 79 Chapter 10 - ENME 382 Spring 2010 Section 0201 14 Adapted from Fig. 10.7, Callister & Rethwisch 3e. α : mostly Cu β : mostly Ag • T E : No liquid below T E : Composition at temperature T E • C E L + β α + β C , wt% Ag 20 40 60 80 100 200 400 600 800 C E T E 8.0 71.9 91.2 779°C Ag) wt% 1.2 9 ( Ag) wt% .0 8 ( Ag) wt% 9 . 71 ( β + α L cooling heating • Eutectic reaction L ( C E ) α ( C α E ) + β ( C β E ) L + α 00 T (°C) 300 L (liquid) α 83 • For a 40 wt% Sn-60 wt% Pb alloy at 150°C, determine:-- the phases present Pb-Sn system EX 1: Pb-Sn Eutectic System Answer: α + β-- the phase compositions-- the relative amount Answer: C α = 11 wt% Sn C β = 99 wt% Sn Chapter 10 - ENME 382 Spring 2010 Section 0201 15 L + β α + β 200 18.3 C , wt% Sn 20 60 80 100 100 183°C 61.9 97.8 β of each phase 150 40 C 11 C α 99 C β S R W α = C β- C C β- C α = 99 - 40 99 - 11 = 59 88 = 0.67 S R + S = W β = C- C α C β- C α = R R + S = 29 88 = 0.33 = 40 - 11 99 - 11 Answer: Adapted from Fig. 10.8, Callister & Rethwisch 3e. Answer: C α = 17 wt% Sn-- the phase compositions 00 T (°C) 300 L (liquid) α L + α • For a 40 wt% Sn-60 wt% Pb alloy at 220°C, determine:-- the phases present: Pb-Sn system EX 2: Pb-Sn Eutectic System-- the relative amount 220 Answer: α + L C L = 46 wt% Sn Chapter 10 - ENME 382 Spring 2010 Section 0201 16 L + β α + β 200 C , wt% Sn 20 60 80 100 100 β 183°C of each phase W α = C L- C C L- C α = 46 - 40 46 - 17 = 6 29 = 0.21 W L = C- C α C L- C α = 23 29 = 0.79 40 C 46 C L 17 C α S R Answer: Adapted from Fig. 10.8, Callister & Rethwisch 3e. • For alloys for which C < 2 wt% Sn • Result: at room temperature-- polycrystalline with grains of α phase having Microstructural Developments in Eutectic Systems I T (°C) 300 L 400 α L L: C wt% Sn Chapter 10 - ENME 382 Spring 2010 Section 0201 17 composition C L + α 200 C , wt% Sn 10 2 20 C 100 α 30 α + β (room T solubility limit) T E (Pb-Sn System) α : C wt% Sn Adapted from Fig. 10.11, Callister & Rethwisch 3e. • For alloys for which 2 wt% Sn < C < 18.3 wt% Sn • Result: at temperatures in α + β range olycrystalline with rains Microstructural Developments in Eutectic Systems II L + α T (°C) 300 L 400 L α L: C wt% Sn C t% Sn Chapter 10 - ENME 382 Spring 2010 Section 0201 18-- polycrystalline with α grains and small β-phase particles Adapted from Fig. 10.12, Callister & Rethwisch 3e....
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This note was uploaded on 01/24/2011 for the course ENME enme382 taught by Professor Bruck during the Spring '10 term at Maryland.

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ENME382 S2010 0201 ch10 part2 - 2 components has a special...

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