The Science and Engineering of Materials (MindTap Course List)
7th Edition
ISBN: 9781305076761
Author: Donald R. Askeland, Wendelin J. Wright
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Question
Chapter 5, Problem 5.25P
To determine
Whether the activation energy for diffusion of carbon in FCC iron is higher or lower than the BCC iron.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
During freezing of a Cu-Zn alloy, we find that the composition is non-uniform. By heating the
alloy to 600°C for 3 hours, diffusion of zinc helps to make the composition more uniform. What
temperature would be required if we wished to perform this homogenization treatment in 30
minutes?
Compare the diffusion coefficients of carbon in BCC and FCC iron at the allotropic transformation temperature of 912°C and explain the reason for the difference in their values.
(b) Illustrate TWO (2) dominant models for atomic diffusion mechanism in metal with description.
Chapter 5 Solutions
The Science and Engineering of Materials (MindTap Course List)
Ch. 5 - What is the driving force for diffusion?Ch. 5 - Give three examples of materials processes that...Ch. 5 - In the carburization treatment of steels, what are...Ch. 5 - Prob. 5.4PCh. 5 - Prob. 5.5PCh. 5 - Prob. 5.6PCh. 5 - Prob. 5.7PCh. 5 - A certain mechanical component is heat treated...Ch. 5 - Prob. 5.9PCh. 5 - Prob. 5.10P
Ch. 5 - Prob. 5.11PCh. 5 - Prob. 5.12PCh. 5 - Prob. 5.13PCh. 5 - Prob. 5.14PCh. 5 - Prob. 5.15PCh. 5 - Prob. 5.16PCh. 5 - Compare the diffusion coefficients of carb on in...Ch. 5 - Prob. 5.18PCh. 5 - Activation energy is sometimes expressed as...Ch. 5 - Prob. 5.20PCh. 5 - The activation energy for the diffusion of copper...Ch. 5 - Prob. 5.22PCh. 5 - Prob. 5.23PCh. 5 - Prob. 5.24PCh. 5 - Prob. 5.25PCh. 5 - Write down Fick’s first law of diffusion. Clearly...Ch. 5 - Prob. 5.27PCh. 5 - Prob. 5.28PCh. 5 - Prob. 5.29PCh. 5 - Prob. 5.30PCh. 5 - A 1-mm-thick BCC iron foil is used to separate a...Ch. 5 - Prob. 5.32PCh. 5 - Prob. 5.33PCh. 5 - A 0.001 in. BCC iron foil is used to separate a...Ch. 5 - Prob. 5.35PCh. 5 - Prob. 5.36PCh. 5 - Prob. 5.37PCh. 5 - Prob. 5.38PCh. 5 - Prob. 5.39PCh. 5 - Prob. 5.40PCh. 5 - Prob. 5.41PCh. 5 - Prob. 5.42PCh. 5 - Prob. 5.43PCh. 5 - Prob. 5.44PCh. 5 - Prob. 5.45PCh. 5 - Prob. 5.46PCh. 5 - Prob. 5.47PCh. 5 - Prob. 5.48PCh. 5 - Pure zinc is to be diffused into copper by dipping...Ch. 5 - Nitriding is a process in which nitrogen is...Ch. 5 - Determine the carburizing time necessary to...Ch. 5 - Prob. 5.52PCh. 5 - Prob. 5.53PCh. 5 - Prob. 5.54PCh. 5 - Prob. 5.55PCh. 5 - Prob. 5.56PCh. 5 - Prob. 5.57PCh. 5 - Prob. 5.58PCh. 5 - Compare the rate at which oxygen ions diffuse in...Ch. 5 - Prob. 5.60PCh. 5 - Prob. 5.61PCh. 5 - Prob. 5.62PCh. 5 - Prob. 5.63PCh. 5 - Prob. 5.64PCh. 5 - Prob. 5.65PCh. 5 - A 0.80% C steel must operate at 950°C in an...Ch. 5 - Prob. 5.67PCh. 5 - Prob. 5.68PCh. 5 - Prob. 5.69PCh. 5 - Prob. 5.70PCh. 5 - Prob. 5.71PCh. 5 - Prob. 5.72PCh. 5 - Most metals and alloys can be processed using the...Ch. 5 - Prob. 5.74PCh. 5 - Prob. 5.75PCh. 5 - Prob. 5.76PCh. 5 - A ceramic part made from MgO is sintered...Ch. 5 - Prob. 5.78PCh. 5 - What are the advantages of using hot pressing and...Ch. 5 - Prob. 5.80PCh. 5 - Prob. 5.81DPCh. 5 - Design a spherical tank, with a will thickness of...Ch. 5 - Prob. 5.83DPCh. 5 - Prob. 5.84DPCh. 5 - Prob. 5.85DPCh. 5 - Prob. 5.86CPCh. 5 - Prob. 5.87CPCh. 5 - Prob. 5.88CPCh. 5 - Prob. 5.1KP
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- (a) Describe with illustration, TWO (2) possible point defects that can occur in metal alloying elements. (b) Nickel and boron are to be diffused into an FCC iron metal during surface treatment. The diffusion process begins at the same time for both nickel and boron atoms. Identify with justification which metal atom diffused at a higher rate during the process. Table 2: Atom and crystal characteristic Atomic radius Crystal Structure Electronegativity Element Ni 0.1246 FCC +2 0.085 Rhombohedral +3 Fe 0.124 FCC +2 C 0.071 НСР +4arrow_forwardCompare the diffusion coefficients for hydrogen and nitrogen in FCC iron at 1000°C and explain the reason for the difference in their values.arrow_forwardDetermine the activation energy for vacancy formation in aluminum, if theequilibrium number of vacancies at 500 °C is 7.57 × 1023 m-3. Given that theatomic weight and density for aluminum are 26.98 g/mol and2.62 g/cm3, respectively.arrow_forward
- You are examining two materials with the same density. One has a BCC crystal structure, and one has a HCP crystal structure. Which do you expect will have more rapid diffusion?arrow_forwardA NIO-20 mol % Mgo ceramic is allowed to solidify. (See the figure below.) Temperature (°C) 2800 2600 2400- 2200 2000 L (Ni, Mg)0 40 60 80 MgO Mole percent MgO NIO 20 (a) Determine the composition (in mol% MgO) of the first solid to form. 80 x (b) Determine the composition (in mol% MgO) of the last liquid to solidify under equilibrium conditions. 35 X%arrow_forward5 During decommissioning work, in order to determine the number of radionuclides deposited in a section of iron pipe, you grind up a small section of the pipe into a fine powder to carry out a reaction at 400 0C. Preliminary analysis shows that the predominant iron species are FeO and Fe2O3 Is it safe to use an aluminum crucible for heating your sample? What about a graphite crucible? Provide a short but detailed explanation referencing Ellingham diagrams, calculating Gibbs Free Energy, as well as provide any relevant reactions.arrow_forward
- If the grain boundary energy for silver is 0.790 J/m2, (a) determine the Zener drag force applied to line of contact for a second phase particle with diameter of 600 nm. (b) Determine, to a fırst approximation, the limiting grain size of silver containing a 1 percent volume fraction of a stable precipitate. O 790 N, 40 µm O 790 N, 80 um O 1580 N, 40 um O 1580 N, 80 umarrow_forward(a) Why is the carbon concentration in austenite (y-Fe) higher than in ferrite (a-Fe)? (b) Determine the volume change accompanied by the transformation of y-Fe (FCC) to a-Fe (BCC) during cooling. Note that the atomic radii for a-Fe, y-Fe, and C are 0.124nm, 0.127mm, and 0.077mm, respectively. (HINT: Because the number of atoms in FCC and BCC differs, consider volume per atom in the calculation of volume change).arrow_forwardP.3 The diffusivity of manganese atoms in the FCC iron lattice is 1.50 x 10-14 m²/s at 1300°C and 1.50 x 10-15 m²/s at 400°C. Calculate the activation energy in kJ/mol for this case in this temperature range. Data: R= 8.314 J/(mol-K).arrow_forward
- Why is the rate of interstitial diffusion mechanism higher than that of vacancy diffusion? * (4 Puan) There are more interstitial sites and interstitial atoms are smaller. There are fewer interstitial sites and interstitial atoms are larger. There are fewer interstitial sites and interstitial atoms are smaller. There are more interstitial sites and interstitial atoms are larger.arrow_forward1. An FCC iron-carbon alloy initially containing 0.20 wt% C is carburized at an elevated temperature and in an atmosphere that gives a surface carbon concentration constant at 1.0 wt%. If after 49.5 h, the concentration of carbon is 0.35 wt% at a position 4.0 mm below the surface, determine the temperature at which the treatment was carried out. 2. Consider a metal single-crystal oriented such that the normal to the slip plane and the slip direction are at angles of 60° and 35°, respectively, with the tensile axis. If the critical resolved shear stress is 20.7 MPa, will an applied stress of 45 MPa cause the single crystal to yield? If not, what stress will be necessary?arrow_forwardNickel oxide (NiO) is a ceramic that has the same crystal structure as NaCl. Given: R(Ni2+)= 0.075 nm and R(02)=0.132 Calculate the lonic Packing Factor (IPF) of NiO? O Na CI Select one: a. 0.47 b, 0.74 c. 0.64 d. 0 12 e. 0.14 f. 0.21 g. 0.41arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University Press
Mechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSON
Thermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEY
Mechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage Learning
Engineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
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
Introduction to Diffusion in Solids; Author: Engineering and Design Solutions;https://www.youtube.com/watch?v=K_1QmKJvNjc;License: Standard youtube license