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Solution8

# Solution8 - 9 m 10 9000 d 4 9 − − × = × = r =4.5 ×...

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HW 8 Solution 12-8 (a) Al-4%Mg Al-6%Mg Al-12%Mg Treat at 210-451°C Treat at 280-451°C Treat at 390-451 °C Age at <210°C(quench) Age at <280°C(quench) Age at < 390°C(quench) (b)Answer will vary depending on aging temperature selected. If all three are aged at 200C, as example, the tie line goes from about 3.8to 35%Mg: Al-4% Mg: % 6 . 0 100 8 . 3 35 8 . 3 4 % = × = β Al-6% Mg: % 1 . 7 100 8 . 3 35 8 . 3 6 % = × = β Al-12% Mg: % 8 . 26 100 8 . 3 35 8 . 3 12 % = × = β (c) Most likely, a coherent precipitate is not formed; simple dispersion strengthening, rather than age hardening, occurs. 12-9 wt% % 12 . 97 100 1 51 5 . 2 53 = × = α , wt% % 88 . 2 = θ Vol fraction 3 3 cm 0182 . 0 669 . 2 12 . 97 26 . 4 88 . 2 cm / g 26 . 4 g 88 . 2 = + = θ θ/cm 3 alloy

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Unformatted text preview: 9 m 10 9000 d 4 9 − − × = × = r =4.5 × 10-4 cm V θ = 3 12 3 4 cm 10 382 ) cm 10 5 . 4 ( 3 4 − − × = × π # of particles = 10 3 12 3 10 76 . 4 cm 10 382 cm 0182 . × = × − particles 12-31 Pearlite = 0.94= 77 . 67 . 6 x 67 . 6 − − x=1.124%C: Hypereutectid 12-56 (a) C % 77 . = γ % 9 . 96 100 77 . 67 . 6 95 . 67 . 6 M % = × − − = (b) C % 82 . = % 8 . 97 100 82 . 67 . 6 95 . 67 . 6 M % = × − − = (c) C % 88 . = % 8 . 98 100 88 . 67 . 6 95 . 67 . 6 M % = × − − = (d) C % 95 . = %M=100%...
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Solution8 - 9 m 10 9000 d 4 9 − − × = × = r =4.5 ×...

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