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

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Page1 / 2

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online