Materials Science and Engineering UPRM（材料科学与工程 UPRM）.pdf

Materials Science and Engineering (INME 4107) 2nd Exam - Home 1. In a new technology for growing FCC single crystals, the growing crystal is pulled in an [110] direction. If the pulling stress is 1MPa; how big will be the resolved shear stress acting in a (111) plane and [10-1] direction? 2. (5 points) A cylindrical rod 120mm long and having a diameter of 15mm is to be deformed using a tensile load of 35000N. It must not experience either plastic deformation or a diameter -2 reduction of more than 0.9x10 mm. Of the materials listed below which are the possible candidates?. Material Modulus of Elasticity (GPa) Yield Strength (MPa) Poisson’s Ratio Al Alloy 70 250 0.33 Ti Alloy 105 850 0.36 Steel Alloy 205 550 0.27 Mg Alloy 45 170 0.20 3. A copper rod 0.25 in. in diameter is to be drawn through a 0.20 in. diameter die in a wire drawing process. Use the graph shown to determine the following: The percentage cold deformation The initial strength required to deform the metal The force required to deform the initial wire is: 4. Using the above graph, suppose we want to reduce a copper plate to a final thickness of 0.1 cm with at least 65000 psi tensile strength, 60000 psi yield strength and 5% elongation. How much cold work is required? Calculate the original plate thickness. The amount of cold work required is between: The original plate thickness must be between: 5. For low concentrations of Zn and Cu, the diffusi