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Problem Set 3 - ° C 5 Some hypothetical alloy has an...

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MECH 210 – Materials Science and Engineering Problem Set 03, Fall Semester 2008 Due Friday (9/26) 1. A specimen 1015 mm long of a low carbon-nickel alloy (Figure 8.31) is to be exposed to a tensile stress of 70 MPa at 427 ° C. Determine its elongation after 10,000 h. Assume that the total of instantaneous and primary creep elongation is 1.3 mm. 2. A cylindrical component constructed from a low carbon-nickel alloy (Figure 8.30) has a diameter of 19.1 mm. Determine the maximum load, in N, that may be applied for it to survive 10,000 h at 538 ° C. 3. From equation 8.19, if the logarithm of s ε & is plotted versus the logarithm of σ , then a straight line should result, the slope of which is the stress exponent n . using Figure 8.31, determine the value for the low carbon-nickel alloy at 427 ° . 4. For an 18-8 Mo stainless steel (Figure 8.35), predict the time to rupture for a component that is subjected to a stress of 100 MPa at 600
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Unformatted text preview: ° C. 5. Some hypothetical alloy has an atomic weight of 184.4 g/mol, a density of 12.30 g/cm 3 , and an atomic radius of 0.146 nm. Determine whether its crystal structure is FCC, BCC, or simple cubic. Justify your determination. 6. Magnesium has an HCP crystal structure, a c/a ratio of 1.624, and a density of 1.74 g/cm 3 . Compute the atomic radius for Mg. Problems 7 and 8 Problem 9 Problem 10 7. The unit cell for a hypothetical metal is shown. (a) To which crystal system does this unit cell belong? (b) What would this crystal structure be called? (c) Calculate the density of the metal if its atomic weight is 141 g/mol. 8. What are the indices for the direction indicated by the vector in the unit cell? 9. (a) Determine the Miller indices for planes A and B shown. (b) What are the indices for the vectors representing the normals to the planes? (c) What is the angle between the two normals in part (b)?...
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