Consider a diffusion couple setup between pure tungsten and a tungsten alloy containing 1 at% thorium. After several minutes of exposure at 2000 C, a transition zone of 0.01 cm thickness is established. What is the flux of thorium atoms at this time if diffusion is due to (a) volume diffusion, (b) grain boundary diffusion, and (c) surface diffusion?
Consider a diffusion couple setup between pure tungsten and a tungsten alloy containing 1 at% thorium. After several minutes of exposure at 2000 C, a transition zone of 0.01 cm thickness is established. What is the flux of thorium atoms at this time if diffusion is due to (a) volume diffusion, (b) grain boundary diffusion, and (c) surface diffusion?
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
Consider a diffusion couple setup between pure tungsten
and a tungsten alloy containing 1 at% thorium. After
several minutes of exposure at 2000 C, a transition zone of
0.01 cm thickness is established. What is the flux of
thorium atoms at this time if diffusion is due to (a) volume
diffusion, (b) grain boundary diffusion, and (c) surface
diffusion?
Transcribed Image Text:O Consider a diffusion couple setup between pure tungsten
and a tungsten alloy containing 1 at% thorium. After
several minutes of exposure at 2000 C, a transition zone of
0.01 cm thickness is established. What is the flux of
thorium atoms at this time if diffusion is due to (a) volume
diffusion, (b) grain boundary diffusion, and (c) surface
diffusion?
TABLE 5-2 I The effect of the type of diffusion for thorium in tungsten and for self-diffusion in
silver*
Diffusion Coefficient (D)
Diffusion Type
Thorium in Tungsten
Silver in Silver
Do cm?/s
Q cal/mole
Do cm?/s
Q cal/mole
66,400
90,000
120,000
0.47
0.068
8,900
22,750
45,700
Surface
Grain boundary
0.74
0.24
Volume
1.00
0.99
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