Temperature dependence of vacancy conc enlralwns. Write a computer program that will provide a user with the equilibriu m concentration of vacancies in a metall ic element as a function of temperature. The user should specify a meaningful and valid range of temperatures (e.g., 100 to 1200 K for copper). Assume that the cryst al structure originally specified is valid for this range of temperature. Ask the user to input the activation energy for the form ation of one mole of vacancies
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The Science and Engineering of Materials (MindTap Course List)
- Sketch the variation of the vacancy concentration as a function of temperature in iron and mark all salient features on your sketch. The melting temperature of iron is 1539 oC.arrow_forwardCalculate the number of vacancies per cm3 expected in copper at 1080°C (just below the melting temperature). The energy for vacancy formation is 20,000 cal/mol.arrow_forwardLead-Tin (Pb-Sn) alloys are used in soldering applications. Draw phase diagram and Distinguish between the micro-structure at composition of “Pb40%Sn” and “Pb80%Sn”.arrow_forward
- Calculate the number of vacancies per cubic meter in gold (Au) at 900C. The energy for vacancy formation is 0.98 eV/atom. Furthermore, the density and atomic weight for Au are 18.63 g/cm3 (at 900C) and 196.9 g/mol, respectively.arrow_forwardA 609 g eutectoid steel ( about 0.8%C) is heated to 1,002 C and cooled slowly through the eutectorid temperature. This results in the formation of cementite Fe3C (6.67%C) and ferrite (0.025%C). Calculate the number of grams of cementite that form in the steel.arrow_forward(b) Illustrate TWO (2) dominant models for atomic diffusion mechanism in metal with description.arrow_forward
- The composition of the α in an 42 wt% griffinium alloy at 662 degrees centigrade is (enter the wt% griffinium)arrow_forwardCalculate the invariant reactions for Cu-Zn Reaction (eutectic eutectoid peritectic peritectoide) Temperature Transformationarrow_forwardDetermine the Miller- Bravais indicesarrow_forward
- You are required to use a furnace-cooled carbon Fe-Mn-0.05C alloy in a structural design that may see service temperatures as low as zero degrees Celsius. From the graph below, suggest an appropriate Mn content (in %) in the alloy.arrow_forwardShow the miller-bravais index for a HCP structure.arrow_forward1. List two interstitial elements that can be added to a metal to improve its strength properties. 2. If carburization of titanium occurs at 573 K, a diffusivity preexponential of 0.022 m^2/sec, and has an activation energy of 97,700 J/mole, first estimate the diffusivity in m^2/sec and then estimate the necessary time to fully carburize titanium if a dimensionless time of 10 is sufficient to do the carburization and the crystal diameter is 100 nm.arrow_forward
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