Isothermal aging curves in Figure 7.17 show that peak yield strength at aging temperatures of 450°F (232°C) and 500°F (260°C) occurs in times of 100.6 hours (4 hours) and 10-0.6 hours (0.25 hours), respectively. Calculate the activation enthalpy for precipitate formation in this alloy.
What will be an ideal response?
(a) This is a rate theory problem and Equation 4.31 is used to solve for the activation enthalpy
You might also like to view...
The Hope Diamond weighs 44.5 carats. There are 200 mg per carat. How many kilograms does the Hope Diamond weigh?
A) 0.000890 kg B) 0.00890 kg C) 0.0890 kg D) 0.890 kg E) 8.90 kg
Why would the English system of units be more useful if a foot contained 10 inches?
What will be an ideal response?
Double-Slit Interference: In a two-slit experiment using coherent light, the distance between the slits and the screen is 1.10 m, and the distance between the slits is 0.0400 mm. If the second order bright fringe is measured to be 4.20 cm from the centerline on the screen, what is the wavelength of light?
A. 200 nm B. 381 nm C. 401 nm D. 620 nm E. 763 nm
Why does Mars's northern ice cap shrink and grow less than Mars's southern ice cap?
A. Mars is closer to the Sun during southern winter. B. The southern ice cap is made of water but the northern ice cap is dry ice. C. Mars is farther from the Sun during southern winter. D. The northern ice cap is made of water but the southern ice cap is dry ice.