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 cm2/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
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 cm2/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
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
Related questions
Question

Transcribed Image Text: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 cm2/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
Expert Solution

This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps

Recommended textbooks for you

Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press

Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON

Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education

Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press

Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON

Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education

Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY

Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning

Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY