Defects in Crystalline Solids (Part-I)

By Prof. Shashank Shekhar   |   IIT Kanpur
Learners enrolled: 263
At the end of the course, the student should be able to
-Have a broad understanding of defects in materials and their role in determining properties of materials
-Have a thorough understanding of the structure of dislocations in various crystals and their elastic fields
-Have an overview of plastic deformation mechanisms and the role of dislocations in plasticity, fracture, fatigue and creep

INTENDED AUDIENCE: Undergraduate Students and first year graduate students of following discipline: Materials Engineering, Mechanical Engineering, Metallurgical Engineering, Industrial Engineering, Electrical Engineering

PREREQUISITES:          Under graduate level mathematics, thermodynamics
INDUSTRY SUPPORT:   Manufacturing Companies, Iron and Steel companies, Automobile companies, Equipment manufacturers, 
Course Status : Ongoing
Course Type : Core
Duration : 8 weeks
Start Date : 26 Jul 2021
End Date : 17 Sep 2021
Exam Date : 26 Sep 2021 IST
Enrollment Ends : 09 Aug 2021
Category :
  • Metallurgy and Material science & Mining Engineering
Credit Points : 2
Level : Undergraduate

Course layout

Week 1  : Introduction to Point defect, Defect structure, Energy andConcentration of Point defect
Week 2  : Intrinsic and Extrinsic defect, Defect reaction and its thermodynamics,
Week 3  : Interstitial and Substitutional Diffusion,
Week 4  : Fundamentals of dislocation, Dislocation model and Dislocation circuit
Week 5  : Stress and strain field around dislocation, Force and energy on dislocation
Week 6 : Image force, Dislocation motion, Slip system, Peierl Nabarro stress, Critical resolved shear stress
Week 7  : Glide, climb and Cross-slip to create steps, Dislocation intersection
Week 8 : Strain and strain rate due to dislocation motion, Dislocation in FCC and BCC, Thompson's Tetrahedron

Books and references

1.Introduction to Dislocations, D. Hull and D.J. Bacon (Main Reference Book)
3.Mechanical Metallurgy, G.W. Dieter
4.Dislocations and Mechanical Behavior of Materials, M.N. Shetty
5.Ebook by Dr. Anandh Subramaniam and Dr. Kantesh Balani (http://home.iitk.ac.in/~anandh/E-book/)
6.Dislocations and Plastic Deformation, I. Kovacs and L. Zsoldos

Instructor bio

Prof. Shashank Shekhar

IIT Kanpur
Prof. Shashank Shekhar is an assistant professor at IIT Kanpur. He joined IITK in 2010 and has since taught manufacturing related courses to 2nd year, 3rd year as well as 4th year UG students. His research interest lies in thermomechanical processing, particularly severe plastic deformation using techniques like machining and constrained groove pressing.

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.
The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).
Date and Time of Exams: 26 September 2021 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.
Registration url: Announcements will be made when the registration form is open for registrations.
The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.
Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.


Average assignment score = 25% of average of best 6 assignments out of the total 8 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Kanpur .It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team

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