are two modes of fracture for metals, as shown below 4. There i) Identify cach f
ID: 707403 • Letter: A
Question
are two modes of fracture for metals, as shown below 4. There i) Identify cach fracture mode. Write the name under each picture. (2 points) ii) Which one experiences plastic deformation? (2 points) ii) Which fracture mode is preferred, and why? (4 points) iv) Which fracture mode requires more strain energy? (2 points) v) Which fracture mode belongs to a tough material? (2 points) vi) In which fracture mode crack propagation occurs in a rapid and unhindered fashion? (2 points) 5. Consider the data below for interdiffusion of carbon in both a-iron (BCC) and ?-iron (FCC) at 900°C. Activation Energy 4 2.60 2.94 0.83 1.53 Calculated Value 2.8 x 101 5.0 x 10-284 62x10-, 23 x 10 148 30 x 10-21 1.8 × 10-15 900 1.1 X 10-1 1100 7.8 x 10. 24 x 10-12 1.7x 10-1. 5.9 x 10-1 1100 53 x 10- 251 (BCC) r-Fe (FCC) a-Fe Fe 900 -Fe Which diffusion couple has the larger diffusion coefficient? Cite that value. Explain why this is the case using Do and Qs values. (6 points)Explanation / Answer
i) 1st one is ductile fracture and 2nd one is complete ductile/progressive fatigue fracture.
ii) Complete ductile fracture/progressive fatigue expiriences plastic deformation.
iii) progressive fatigue is preffered as of plastic deformation.
iv) Ductile mode required more dtrain energy.
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