1. No category

Special Topics - High Temperature Deformation and Creep of Materials
NE795-601/MSE791-005/603 Special Topics (3 CHs) – Spring 2015
(on-campus and DE) M, W, F: 10:15-11:05am
High Temperature Deformation and Creep of Materials
Objective: The course is intended to introduce students to theories of high temperature deformation and
creep along with their applications in materials design. Various phenomenological models
along with creep theories will be dealt with emphasis on high temperature deformation of
metals (alloys) and ceramics.
Note: You are expected to read and learn yourself; video lectures and power point files are essentially to
introduce you to the subject matter - Due to small number of registered students, regular video lectures are
cancelled and lectures from previous times are uploaded to be viewed by the students according to the schedule
listed below. Corresponding power-point presentations will also be available on the course web.
While on-campus students have access to face-to-face discussions, DE students are urged to contact the instructor(s)
for any doubts/clarifications.
Outline:
1. General Aspects of Time Dependent Plastic Flow
2. Phenomenological Description of Plastic Deformation (Zener-Holloman and Sherby-Dorn
Parameters, Sherby and Dorn equations, Monkman-Grant Relation, Concept of effective diffusvity)
3. Theories of Creep [Diffusion, Harper-Dorn, Climb, Glide (solid solution alloys), GBS,
Superplasticity]
4. Deformation Mechanism Maps (Ashby and Langdon-Mohamed)
5. Applications of Deformation Mechanism Maps [turbines, nuclear reactor component, metal
forming and shaping, polar ice cap, olivine (upper mantle), etc]
Grading: Home Work Assignments (25%), Term-Long Project (20%), Tests (take-home) (20+35)
--------Ppt presentations:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Introduction
General Aspects of Plasticity & Mechanical Equation of State (MEOS)
Temperature Dependence of Steady-State Creep-Rate
Stress Dependence of Creep -----------------------------------------------------------Stress Dependence of Creep (contd) – Glide-climb model ------------------------Creep of Pure Metals (Class-II or class-M alloys)
Take-home Exam 1 (mid-March)
Steady-State Creep Behavior of Alloys (Class-I) -----------------------------------Stress & Creep Rupture (NE509)------------------------------------------------------Grain Boundary Sliding (GBS)
Superplasticity ---------------------------------------------------------------------------Creep of Precipitation & Dispersion Strengthened Materials ---------------------Creep Mechanisms and Deformation Mechanism Maps (2D-3D) -----------------
KL Murty Assignment #1
Assignment #2
Assignment #3
Assignment #4
Assignment #5
Assignment #6
Assignment #7
page 1 Special Topics - High Temperature Deformation and Creep of Materials
Term-Long Project Information
High Temperature Deformation and Creep of Materials
Following is a list of topics for term-long project. You can choose one of these or any of
your own. Whatever you decide, please let me know first and get my approval prior to beginning
the research. You should emphasize on the details of the underlying micromechanisms for creep
or deformation and try to be as detailed as possible with emphasis on recent work. The report
should not exceed 10 typed pages (single spaced, 8x10 sheets with 1” margins (top/bottom and
left/right) including figures and references. Please follow the format used in Journal of Nuclear
Materials starting with an abstract and ending with conclusions/summary. Project reports are due
by the Thursday, April 23, 2015.

Creep of dispersion strengthened alloys

Harper-Dorn creep in metals and ceramics

Superplasticity in ceramics

Diffusion creep of two-phase Materials

Creep of nanostructured materials

Radiation creep of metals

Swelling and creep of nuclear fuels

Internal stresses in high temperature creep of metals

Creep of Zirconium alloys – effects of radiation, anisotropy and alloying

Fracture mechanisms (& maps)

Deformation mechanism maps
[Choose your own system and creep equations with various experimentally evaluated
parameters. Develop an appropriate computer algorithm to construct the whole creep
mechanism map]
KL Murty page 2 Special Topics - High Temperature Deformation and Creep of Materials
References (books):
1. M.E. Kassner and M.T. Perez-Prado, Fundamentals of Creep in Metals and Alloys, Elsevier,
2004.
2. J. Cadek, Creep in Metallic Materials, Elsevier, 1988.
3. F. Garofalo, Fundamentals of Creep and Creep-Rupture in Metals, McMillan, 1965.
4. Jean-Paul Poirier, Creep of Metals, Cambridge University Press, 1985.
5. R.W. Evans and B. Wilshire, Creep of Metals and Alloys, The Institute of Metals, London, 1989.
6. J.H. Gittus, Creep, Viscoplasticity and Creep Fracture in Solids, John Wiley, 1975.
7. J. Gittus, Irradiation Effects in Crystalline Solids, Applied Science Publishers, 1978.
8. B. Burton, “Diffusional Creep of Polycrystalline Materials,” Trans. Tech. Publications 1977.
Monographs: (examples)
There are many review articles especially during late 60s and 70s that are very useful to understand creep
mechanisms and the following is a very short list that used and enjoyed.
1. O.D. Sherby and P.M. Burke, “Mechanical Behavior of Crystalline Solids at Elevated
Temperature,” Progress in Materials Science, vol.13 (1968) 325-390.
2. J.E. Bird, A.K. Mukherjee and J.E. Dorn, “Experimental Correlations Between High-Temperature
Creep Behavior and Structure,” in ‘Quantitative Relation between Properties and Microstructure,’
D.G. Brandon and A. Rosen (eds.), Israel Uni Press (1969) pp.255-342.
- a shorter version may be found in A.K. Mukherjee, J.E. Bird and J.E. Dorn, “Experimental
Correlations for High Temperature Creep,” Trans. ASM, vol. 62 (1969) 155.
3. R. Lagneborg, “Dislocation Mechanisms in Creep,” International Metallurgical Reviews, vol. 17
(1972) 130.
4. T.G. Langdon, “Recent Developments in Deformation Mechanism Maps,” Metals Forum, vol. 1
(1978) 99.
- T.G. Langdon, “Dislocations and Creep,” in ‘Dislocations and properties of Real Materials,’ The
Institute of Metals, London (1985) pp. 221-238.
5. D. McLean, “The Physics of High Temperature Creep in Metals,” Report on Progress in Physics, vol.
29 (1966) 1.
- also see D. McLean, “Deformation at High Temperature,” Metal. Review, vol. 7 (1962) 481.
6. K.L. Murty, S. Gollapudi, K. Ramaswami, M.D. Mathew and I. Charit, “Creep deformation of
materials in light water reactors (LWRs),” in ‘Materials ageing and degradation of light water reactors
– mechanisms and management,’ K.L. Murty (ed.) Woodhead Publishing Series in Energy, in print.
KL Murty page 3