19 - 90 / 24 . 7 10 100 100 cm g cm g cm g C C Pb Pb Sn Sn...

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1 Lu ECE331 Phase Amounts in Eutectic Microstructures 1. Eutectic Amount 2. Primary α in Eutectic 3. Total α 4. Total β R Q P P W R Q P R Q W Q P Q W Q P P W W L e + + = + + + = + = + = = β α ' Lu ECE331 Example . For a 40 wt% Sn – 60 wt% Pb at 150°C, (a)What phases are present? α and β coexist. (a) What are the compositions (in wt%) of the phases? Tie line C α = 10% Sn C β = 98% Sn
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2 Lu ECE331 (a)What are mass factions of phases? Apply lever rule (c) If ρ Pb = 11.23 g/cm 3 , ρ Sn = 7.24 g/cm 3 at 150°C, what are volume factions of phases? To find the volume fractions, we need to find average densities of α and β phases. 34 . 0 10 98 10 40 66 . 0 10 98 40 98 1 1 1 1 = = = = = = C C C C W C C C C W β α Lu ECE331 So, Similarly, 2 2 1 1 100 ρ C C ave + = 3 3 3 ) ( ) ( / 64 . 10 / 23 . 11
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Unformatted text preview: 90 / 24 . 7 10 100 100 cm g cm g cm g C C Pb Pb Sn Sn = + = + = 3 3 3 ) ( ) ( / 29 . 7 / 23 . 11 2 / 24 . 7 98 100 100 cm g cm g cm g C C Pb Pb Sn Sn = + = + = 3 Lu ECE331 Then the volume fractions, 43 . 1 43 . / 29 . 7 34 . / 64 . 10 66 . / 29 . 7 34 . 57 . / 29 . 7 34 . / 64 . 10 66 . / 64 . 10 66 . 3 3 3 3 3 3 = = = + = + = = + = + = V V or cm g cm g cm g W W W V cm g cm g cm g W W W V...
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19 - 90 / 24 . 7 10 100 100 cm g cm g cm g C C Pb Pb Sn Sn...

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