Whatare the effects of recrystializationon the grains.and mechanicalproperties of metals? (select all that apply)0DYield streynth decreases.Hardness decreasesbecome more roundGrainsDuctility Decreases

Introduction Recrystallization is the process of replacing defective grains with new grains that…

Answered: What are on the grains the effects of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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1. There are three slip systems on a FCC octahedral plane, i.e. one of the {111} planes. Assume a2 MPa tensile stress is applied along the [100] direction of a gold single crystal, whose criticalresolved shear stress is 0.91 MPa at room temperature. Demonstrate quantitatively thatmeasurable slip will not occur on any of the three slip systems containing the (111) plane as aresult of this applied tensile stress. (Hint: Schmid’s law) 2. Identify the Burgers vector (using vector notation) of a screw dislocation that can cross-slipbetween (111) and (111) planes of an FCC crystal (Hint: Use Weiss zone law). 3. Why are dislocations not considered thermodynamic equilibrium defects like vacancies?Explain by describing the relative interplay between entropy and enthalpy affecting the Gibbsfree energy of the dislocations-containing material system.
The yield strength for an alloy that has an average grain diameter of 1.6 × 10-2 mm is 320 MPa. At a grain diameter 3.9 × 10-3³ mm, the yield strength increases to 480 MPa. At what grain diameter (in mm) will the yield strength be 441 MPa? i mm
The yield strength for an alloy that has an average grain diameter of 5.3 x 10 146 MPa. At a grain diameter of 7.8 × 10-3 mm, the yield strength increases to 249 MPa. At what grain diameter, in mm, will the yield strength be 236 MPa? d = Ex 0.0022 mm Check Try again 1
During the recrystallization of a cold-worked material, which of the following statement(s) is (are) true? O There is some reduction in the number of dislocations. O Some of the internal strain energy is relieved. O The metal becomes more ductile, as in its precold-worked state. O Grains with high strains are replaced with new, unstrained grains. O There is a significant reduction in the number of dislocations, to approximately the number found in the precold-worked state, O The thermal conductivity is recovered to its precold-worked state. O All of the internal strain energy is relieved. O The electrical conductivity is recovered to its precold-worked state.
Consider the tensile stress-strain diagram below. If samples 1 and 2 are identical except for the grain size, which sample has smaller grains? Note: This question will be marked negatively so consider your answer carefully. A. The samples have the same grain size B. Sample 1 C. Sample 2
4. The average grain diameter for a brass material was measured as a function of time at T, which is tabulated below at two different times: Time (min) Grain Diameter (mm) 30 90 3.9 × 10-2 6.6 × 10-2 (a) What was the original grain diameter (using n=2)? (b) What grain diameter would you predict after time, t, at temperature, T? Use T = 650 °C; t = 150 min; n = 2 in the grain size equation
Using the values found in the previous two questions, use the Hall-Petch equation and the graph below for a 70 Cu-30 Zn cartridge brass to predict the yield strength (in MPa) of this alloy when the average grain diameter is 1.0 x 10³ mm. Enter only the numerical value, do not include the unit. Grain size, d (mm) 10- 10-2 5 x 103 200 150 100 50 4 8. 12 16 d1/2 (mm-1/2) Yield strength (MPa)
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A copper-zine alloy has the properties shown in the table below. Grain Diameter (mm) Strength (MPa) 0.015 170 MPa 0.025 158 MPa 0.035 151 MPa 0.050 145 MPa Determine (a) the constants in the Hall-Petch equa- tion; and (b) the grain size required to obtain a strength of 200 MPa.
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O The following engineering stress-strain data were obtained for a 0.2% C plain-carbon steel. (i) Plot the engineering stress-strain curve. (ii) Determine the ultimate tensile strength of the alloy. (iii) Determine the percent elongation at fracture. Engineering Engineering Engineering Engineering Stress Strain Stress Strain (ksi) (in./in.) (ksi) (in./in.) 76 0.08 30 0.001 75 0.10 55 0.002 73 0.12 60 0.005 69 0.14 68 0.010 65 0.16 72 0.020 56 0.18 74 0.040 51 0.19 75 0.060 (Fracture)

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What are on the grains the effects of recrystialization. and mechanical properties of metals? (select all that apply. Yield streynth decreases. Hardness decreases. Grains become more round. Ductility Decreuses