# Quiz 4 - Eutectic 72 600°C Peritectic 40 535°C 3 For the...

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QUIZ # 4 Name ____ Answer Key ______________ ENMA 300 December 8, 2010 The following THREE questions refer to the phase diagram between METAL A and METAL B in FIGURE 1. 1. Please identify in the table below, the phases present in each of the numbered regions of the phase diagram (figure 1). (10 pts) Figure 1 Region Phase(s) Present in the Region 1 α + L 2 β + L 3 β 4 β + L 5 γ + L L α γ α + β β + γ 72% 40% 50% A B Composition (%B) 400°C 800°C 600°C 200°C 535°C 1 2 3 4 5

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2. For the phase diagram above (figure 1), please identify the composition and temperature at which each of the following transformations occur. (8 pts) REACTION Composition (% B) Temperature
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Unformatted text preview: Eutectic 72% 600°C Peritectic 40% 535°C 3. For the phase diagram above (figure 1), the β phase would be considered to be which of the following: a) covalent compound b) pure metal c) intermetallic compound or d) none of the above (2 pts) C. Intermetallic Compound 4. DIFFUSION: If Cu diffuses 1 mm in Ni in 1 hour at 650°C, how far will Cu diffuse in Ni in 4 hours at the same temperature. (5 pts) 2 2 2 1 2 1 Dt x Dt x = Æ ) 4 ( ) 1 ( ) 1 ( 2 2 2 hr D x hr D mm = x 2 = 2 mm USEFUL DIFFUSION EQUATIONS J = -D(dC/dx) D = D o exp (-Ea/kT) dC/dt = D(d 2 C/dx 2 ) ) 2 ( 1 ) , ( Dt x erf C C C t x C o S o − = − − C Dt x = 2...
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Quiz 4 - Eutectic 72 600°C Peritectic 40 535°C 3 For the...

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