A cold worked Al-alloy component takes 200 minutes to recrytallize at 250 °Č but takes 14 minutes at 276 °C. How long will the recrystallization take place at 320 °C. Can you cold work or strain harden this component at 320 °C? Why? Note: recrystallization time shows Arrenius type temperature dependence: E tree = Bexp(-4), kT where B is constant, k is Boltzmann’s constant and E4 is activation energy.

A cold worked Al-alloy component takes 200 minutes to recrytallize at 250 °Č but takes 14 minutes at 276 °C. How long will the recrystallization take place at 320 °C. Can you cold work or strain harden this component at 320 °C? Why? Note: recrystallization time shows Arrenius type temperature dependence: E tree = Bexp(-4), kT where B is constant, k is Boltzmann’s constant and E4 is activation energy.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A sheet of a 70% Cu-30% Zn alloy is cold-rolled 20% to a thickness of 3.0mm. The sheet is then further coldrolledto 2.0 mm. What is the percentage cold work?
The lower yield point for a certain plain carbon steel bar is found to be 135 MPa, while a second bar of the same composition yields at 260 MPa. Metallographic analysis shows that the average grain diameter is 50 µm in the first bar and 8 µm in the second bar. Predict the grain diameter needed to cause a lower yield point of 205 MPa.
The critical resolved shear stress for copper is 0.48 MPa. Determine the maximum possible yield strength for a single crystal of Cu pulled in tension.
An uncold-worked brass specimen of average grain size 0.006 mm has a yield strength of 178 MPa. Estimate the yield strength of this alloy (in MPa) after it has been heated to 600°C for 1000 s, if it is known that the value of ky is 11 MPa-mm1/2. The Animated Figure 7.25 may be helpful. Attached is the question and the figure referenced.
The lower yield point for a certain plain carbon steelbar is found to be 135 MPa, while a second bar of the samecomposition yields at 260 MPa. Metallographic analysisshows that the average grain diameter is 50μm in the firstbar and 8μm in the second bar.a. Predict the grain diameter needed to cause a loweryield point of 205 MPa.b. If the steel could be fabricated to form a stablegrain structure of 500 nm grains, what strengthwould be predicted?c. Why might you expect the upper yield point to bemore alike in the first two bars than the lower yieldpoint?
Do you have an answer to Q3? "Determine values for the constants n and k for the recrystallization of copper at 119°C. Enter your results in the questions below" j
The yield stress of AISI 1020 steel with a grain size of 200 μm is 200 MPa.Estimate the yield stress for a grain size of 10 μm if the Hall--Petch constantk = 0.8 MN/m3/2.
A batch of casted mild steel has a modulus of elasticity of 200 GPa and a yield strength of 250MPa. Calculate for its modulus of resilience. After cold working the steel, the yield strength increases to 310 MPa. Calculate for the percent reduction in the average grain diameter given σo =70 MPa and k = 0.74.
What is G-P zone? Draw yield stress vs. aging time, use a simple sketch andexplain the mechanism. Why does yield stress change by aging time ?
Ordinary sheets of borosilicate glass are tested in bending, and are found to fracture at an average stress of 72 MPa. After thermal tempering, the stress at failure increases by 90%. What are the sign and magnitude of the stress induced in the glass by the tempering operation?
room temperature plastic deformation of pure lead (pb), with recrystallization temperature of -4, will enhance its: a. tensile strength b. modulus of elasticity c.ductility d. none of the above please explain
Assume the following elastic loading exists on ablock of copper:σX = 325 MPa; σY = 80 MPa; and τXY = 40 MPaCalculate eX and eZ for this block, assuminga. that it is a random polycrystalline material.b. that it is a single crystal with the tensile and shearaxes lining up along unit cell axes.c. Explain why the relative strain values you calculated along the X axis make sense for the two cases,based on the elastic anisotropy of copper.