Defects in Crystalline Solids (Part-II)

By Prof. Shashank Shekhar   |   IIT Kanpur
Learners enrolled: 48
This is a continuation of the course “Defects in Crystalline Solids (Part-I). In this part of the course, students should be able to Understand dislocations with respect to particular crystal system (eg. FCC, BCC, HCP and also superlattices)Relate dislocation to the plastic properties of the material, particularly, strengthening mechanisms

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, thermodynamicsl

INDUSTRY SUPPORT: Manufacturing Companies, Iron and Steel companies, Automobile companies, Equipment manufacturers,
Course Status : Upcoming
Course Type : Core
Duration : 4 weeks
Start Date : 23 Jan 2023
End Date : 17 Feb 2023
Exam Date : 26 Mar 2023 IST
Enrollment Ends : 30 Jan 2023
Category :
  • Metallurgy and Material science & Mining Engineering
Credit Points : 1
Level : Undergraduate

Page Visits

Course layout

Week 1: Dislocations in FCC; Partial Dislocations; Thompson’s Tetrahedron; Cottrell Lock; Lomer-Cottrell Lock; Intersection of extended dislocations
Week 2: Dislocations in BCC, HCP and other systems; Dislocations in Superlattices; Kear-Wilsdorf Locks
Week 3: Interaction of dislocations with vacancies and its effect on plasticity; Strengthening mechanisms due to interaction of dislocations with interfaces, precipitates, inclusions; Dislocation generation mechanisms
Week 4: Dislocations and Grain boundaries; Read-Shockley model for Low angle grain boundaries; A modified model for LAGB energy; Energy of LAGBs from dislocation model; CSL boundaries and secondary dislocations; Geometrically necessary dislocations (GNDs) and Statistically Stored Dislocations (SSDs).

Books and references


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: March 26, 2023 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 3 assignments out of the total 4 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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