1. The activation energy for diffusing copper in nickel is 2.7 x 10-5 m²/s and the activation energy is 256000 J/mole. Calculate the diffusivity expected at 300C. Show your work in the designated box on the following page. Answer to 1.
1. The activation energy for diffusing copper in nickel is 2.7 x 10-5 m²/s and the activation energy is 256000 J/mole. Calculate the diffusivity expected at 300C. Show your work in the designated box on the following page. Answer to 1.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Question
Transcribed Image Text:1. The activation energy for diffusing copper in nickel is 2.7 x 10-5 m²/s and the
activation energy is 256000 J/mole. Calculate the diffusivity expected at 300C.
Show your work in the designated box on the following page.
Answer to 1.
2. The chart below contains atomic radii, crystal structure, and valence for materials that might form a
solid solution with copper.
a. Which material is most likely to form a substitutional solid
solution with copper?
b. Which other materials could potentially form a
substitutional solid solution with copper?
c. Which materials could potentially form an
interstitial solid solution with copper?
Element Atomic Radius, pm
Aluminum
143.1
71
124.9
127.8
46
124.1
124.6
60
137.6
138.7
144.5
Carbon
Chromium
Copper
Hydrogen
Iron
Nickel
Oxygen
Palladium
Platinum
Silver
Crystal structure
FCC
BCC
FCC
BCC
FCC
FCC
FCC
FCC
b. Calculate the activation energy for diffusion of Magnesium in
Aluminum, Q.
Valence
c. Calculate the diffusivity of Magnesium in Aluminum at 400C.
+3
+3
+2
+2
+2
+2
+2
+1
Answer to 2a.
Answer to 2b.
3. The diffusivity of Magnesium in Aluminum is 1.668 x 10¹3 m²/s at 500C and 1.352 x 10-¹5 m²/s at 300C.
Show your work in the designated box on the following page.
a. Calculate the Diffusion constant, Do
Answer to 2c.
Answer to 3a.
Answer to 3b.
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