11 Sometimes coso cos A in Equation 7.2 is termed the Schmid factor. Determine the magnitude of the Schmid factor for an FCC single crystal oriented with its [120] direction parallel to the loading axis.
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- DeterminetheMiller_lndex_0f the given direction in an HCP crystal? Write the negative sign if the index is negativeAn alloy has an activation energy for crystal growth of 120 kJ/mol. By what factor would the rate of crystal growth change by dropping the alloy temperature from 500°C to room temperature (25°C)? The answer is: _________ x10^12Explain why martensite is hard? What is the crystal structure of martensite? Show the positions of carbon atoms in unit cell of martensite.
- Cu single crystal is anisotropic in nature. If it has the Compliance matrix elements such as shown below, what is the various E’s, G’s and Poisson’s ratios of this anisotropic single crystal Cu?A small-angle tilt boundary has a misorientation of 0.1◦. What is thespacing between the dislocations in this boundary if the Burgers vector ofthe dislocation is 0.33 nm?Is there any relationship between a crystal and a grain? justify your answer.
- a. For a FCC crystal, list all the planes in the {1 2 1} family. b. Would you expect a family in a face-centered orthorhombic (FCO) crystal to have more or fewer planes than the same family in a FCC crystal? Explain your answer.How many vacancies per cubic centimeter are there in gold, at ambienttemperature, assuming a lattice parameter of 0.408 nm? Gv = 1.4 × 10−19.1) For the HCP crystal structure, show that the ideal c/a ratio is 1.633
- 3. BCC Li has a lattice parameter, ao, of 0.35089 nm and contains 1 vacancy per 300 unit cells at 200 C.a) Calculate the number of vacancies/cubic centimeterb) For the number of vacancies given in the problem statement (i.e. 1 vacancy per 300 units cells), determine the corresponding density of the Li sample.Given that the expression for the equilibrium concentration of point defects are similar for pure metals, will there be identical amount of vacancies and (self-) interstitial atoms at room temperature? Justify your answerwhat microstructure is this ASTM A128 material