Explain with the aid of diagrams the difference between self-diffusion and interdiffusion when applied to atoms...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
Explain with the aid of diagrams the difference between self-diffusion and interdiffusion when applied to atoms in a solid. [4] (b) In metals the two dominant forms of diffusion are vacancy diffusion and interstitial diffusion. With the use of diagrams, explain what these are. [4] (c) Explain how the concept of a diffusion coefficient arises from Fick's First Law of diffusion. Under what conditions does Fick's First Law apply? [4] (d) The diffusion coefficient D varies with temperature T in the form where D0 is the diffusion constant, Qd is the activation energy and R is the gas constant (8.31 J/mol. K) D = Do exp - Qa RT Figure shows experimental data for the diffusion of carbon in alpha (BCC) iron. From the plot, determine the activation energy Qd and the diffusion constant DO. D in cm²/s -40 10-2 10-6 10-10 10-14 10-18 10-20 -10 27 Temperature (°C) 100 4.2 3.8 3.4 3.0 2.6 2.2 1.8 1.4 1.0 0.6 10³/T(K) 0 Explain with the aid of diagrams the difference between self-diffusion and interdiffusion when applied to atoms in a solid. [4] (b) In metals the two dominant forms of diffusion are vacancy diffusion and interstitial diffusion. With the use of diagrams, explain what these are. [4] (c) Explain how the concept of a diffusion coefficient arises from Fick's First Law of diffusion. Under what conditions does Fick's First Law apply? [4] (d) The diffusion coefficient D varies with temperature T in the form where D0 is the diffusion constant, Qd is the activation energy and R is the gas constant (8.31 J/mol. K) D = Do exp - Qa RT Figure shows experimental data for the diffusion of carbon in alpha (BCC) iron. From the plot, determine the activation energy Qd and the diffusion constant DO. D in cm²/s -40 10-2 10-6 10-10 10-14 10-18 10-20 -10 27 Temperature (°C) 100 4.2 3.8 3.4 3.0 2.6 2.2 1.8 1.4 1.0 0.6 10³/T(K) 0
Expert Answer:
Answer rating: 100% (QA)
The image you sent is a question from a materials science exam paperwhich asks about the difference between selfdiffusion and interdiffusionSelfdiffus... View the full answer
Related Book For
Income Tax Fundamentals 2013
ISBN: 9781285586618
31st Edition
Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill
Posted Date:
Students also viewed these finance questions
-
A sample containing an alkali sulfate is dried, weighed and dissolved in dilute HCl. Barium chloride solution is added in excess to precipitate barium sulfate, and the precipitate is digested in the...
-
The Crazy Eddie fraud may appear smaller and gentler than the massive billion-dollar frauds exposed in recent times, such as Bernie Madoffs Ponzi scheme, frauds in the subprime mortgage market, the...
-
John Woods' weekly gross earnings for the present week were $2,500. Woods has two exemptions. Using an $80 value for each exemption and the tax rate schedule below, what is Woods' federal income tax...
-
Refer to The Public Manager (Summer 2008) performance ratings of government agencies, Exercise 8.32. Evaluation scores for all agencies were obtained for two consecutive years and are saved in the...
-
The top music genres according to SoundScan for 2012 are Rock, Alternative, R&B, and Country. These and other music genres along with the number of albums sold in each (in millions) are shown here:...
-
Briefly explain the difference between accounting, finance, and engineering economics. Try to put the concepts in your own (or your team's) words and compare the concepts where appropriate.
-
Nathans Athletic Apparel has 2,000 shares of 5%, $100 par value preferred stock the company issued at the beginning of 2014. All remaining shares are common stock. The company was not able to pay...
-
A wrench 30 cm long is attached to a nut and bolt. You exert a 15 N force on the wrench. What is the maximum torque you can exert under these conditions? A rubber ball (1 kg) falls from a height of...
-
Parson Company acquired an 80 percent interest in Syber Company on January 1, 2020. Any portion of Sybers business fair value in excess of its corresponding book value was assigned to trademarks....
-
Is there any indication that the current disruptions to global supply chain had an impact on the bottom-line of Walmart or Target? Substantiate your answer. Research this by using recent news...
-
The following is the inventory of items received to continue the examination at Johnson Real Estate. The goal is to focus on the missing deposits: who, what, when, where, and how. Documents...
-
What is a genetic cross?
-
Why is Internet fraud particularly difficult to police? 1. More people are online feeding leads to police. 2. Con artists are more convincing online than they are when operating in person. 3. Nearly...
-
Which of the following is not true with regard to evidence? 1. Evidence is anything legally admitted at trial. 2. Evidence is anything perceivable by the five senses: sight, hearing, touch, smell,...
-
What is the cause of Down syndrome?
-
You are analyzing HUE stock. You expect that the dividends over the next three years will be $1.75 in year 1, $1.90 in year 2, $2.00 in year 3 and that HUEs stock price will be $46.32. What is the...
-
A fast-food restaurant averages 150 customers per hour. The average processing time per customer is 90 seconds. a. Determine how many cash registers the restaurant should have if it wishes to...
-
The following additional information is available for the Dr. Ivan and Irene Incisor family from Chapters 1-5. Ivan's grandfather died and left a portfolio of municipal bonds. In 2012, they pay Ivan...
-
The following additional information is available for the Dr. Ivan and Irene Incisor family. Ivan and Irene have the following investment income, in addition to that reported in Chapter 1: Dividends...
-
Clifford Johnson has a limited partnership investment and a rental condominium. Clifford actively manages the rental condominium. During 2012, his share of the loss from the limited partnership was...
-
What concept does density represent?
-
What are the seven SI base units and the physical quantities they represent?
-
What two pieces of information are necessary to express any physical quantity?
Study smarter with the SolutionInn App