Posted: September 3rd, 2023
Hexagonal close-packed zinc slips only by basal plane slip
MSE 251 PROBLEM SET 5DUE: March 11, 2014 (Sunpower)March 28, 2014 (FYZ)1. Hexagonal close-packed zinc slips only by basal plane slip. A zinc single crystal is oriented sothat the normal to its slip plane makes an angle of 60o with the tensile axis. If the three slipdirections have angles of 38o, 45o and 84o with respect to the tensile axis, and the criticalresolved shear stress for the material is 2.3 MPa determine the tensile stress at which plasticdeformation commences. 10 pts.2. A single crystal having a simple cubic structure (slip plane (001), slip direction [010]) is orientedsuch that the tensile axis is parallel to the [010] crystal axis. Make a list of the slip systems inthis crystal and calculate the Schmid factor for each slip system. 10 pts.3. Convert the tensile stress-strain curve of the copper single crystal with a [123] orientation (seeFig. 4.5 of Courtney reproduced in the next page) into a shear stress-shear strain curve. 10 pts.4. In an ionic crystal, the slip planes belong to {110} form and the slip directions to the <1-10>family. How many independent slips systems are present in this structure? Will the crystal beductile or brittle? Prove using the method of solution to the sample problem given in class.10 pts.
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