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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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This note was uploaded on 08/02/2011 for the course ENMA 300 taught by Professor Alsheikhly during the Spring '11 term at University of Maryland Baltimore.
- Spring '11