Engineering Materials

Class: 12ME (Section A & B) Assignment-1 Last Date of Submission:

1. What is Materials Engineering? Why Study Materials Engineering? Note any two types of advanced materials along with their distinctive features.

2. Give the general classification of Engineering Materials.3. What is allotropy? Why is carbon, in the form of diamond, one of the hardest materials known, but

as graphite is very soft and can be used as a solid lubricant?4. Differentiate between (i) a unit cell and a single crystal, and (ii) crystalline and amorphous materials.

State any two applications where single crystals are used. 5. What is a slip system, and what is its significance? Do all metals have the same slip system? Why

or why not?6. Describe (i) point defect and its types, (ii) Line defect (dislocation) and its types, (iii) surface defect

and its types. 7. What is twinning? How does it differ from slip?8. Determine the Miller indices of planes A, B and C in Figure below:

9. Describe three basic crystal structures in metals. Calculate the volume of BCC, FCC and HCP unit cells in terms of the atomic radius R.

10.Describe your understanding of why different crystal structures exhibit different strengths and ductilities.

11.What effects does recrystallization have on the properties of metals?12.Show for the body-centered cubic crystal structure that the unit cell edge length a and the atomic

radius R are related through .13.Show that the atomic packing factor for BCC, FCC and HCP is 0.68, 0.74 and 0.74 respectively.14.Show that for HCP the c/a ratio is 1.633.15.What are the major categories of ferrous alloys?16.List the basic raw materials used in making iron, and explain their functions. Also describe several

chemical reactions that take place before the iron is finally produced from Blast furnace.17.List the types of furnaces commonly used in steelmaking, and describe their characteristics.18.What are the percentage carbon contents of low carbon, medium-carbon, and high-carbon steels?

And how do stainless steels become stainless?19.Explain the copper extraction method. What are the major uses of copper? What are the alloying

elements in brass and bronze, respectively? 20.What three pieces of information can be obtained for each point in an equilibrium phase diagram?

What is a tie-line?21.What are the four single phases in the iron–iron carbide diagram? Provide both the phase diagram

notation and the assigned name.22.Describe the conditions of complete solubility, partial solubility, and insolubility.23.What is the mechanism of corrosion in metals? Describe why, and under what conditions the

corrosion occurs.

24.Describe the various methods of preventing corrosion.

Engineering Materials

Class: 12ME (Section A & B) Assignment-2

1. What is heat treatment? What types of properties can be altered through heat treatment?2. What is the major process difference between full annealing and normalizing?3. What is strain hardening, and what effects does it have on the properties of metals?4. Describe the events that occur when a specimen undergoes a tension test. Sketch a plausible

stress-strain curve, and identify all significant regions and points between them. Assume that loading continues up to fracture.

5. What is Hooke’s law? Young’s modulus? Poisson’s ratio?6. State the purposes of and describe procedures for the following heat treatments: process annealing,

stress relief annealing, normalizing, full annealing, and spheroidizing.7. Describe the intended final microstructure for each of the following heat treatment procedures for

steels: full annealing, normalizing, quenching, and tempering.8. Cite advantages and disadvantages of hot working and cold working.9. What is rolling process in metals? Describe various types of rolling operations and name several

products that can be made by each of the operations.10.Describe polymers and various classifications of polymers. 11.What is the primary type of atomic bonding within polymers? Describe structure of different

polymers.12.Differentiate between thermoplastics & thermo-sets. Define their properties and applications. Explain

why thermoplastics are easier to recycle than thermo-sets. 13.What is the primary type of atomic bonding within polymers? Describe structure of different

polymers.14.What are Elastomers, define their properties and applications. 15.Discuss various techniques of processing polymers. Also describe thermo-forming, cold forming and

solid forming in polymers.16.What are ceramic materials? Explain how ceramic materials can be classified in different ways.17.What are the primary types of atomic bonds in ceramics? Describe general properties of ceramics.18.State applications of the following ceramics: (a) alumina, (b) silica, (c) barium titanate, (d) zirconia,

(e) boron carbide, and (f) diamond.19.What are composites? Give classification of composites.20.Explain the characteristics of fiber phase that affect the properties of fiber-reinforced composites. In

a fiber-reinforced composite, what is the role of the matrix?21.What is a nanocomposite? Give two examples for which composites are used for non-structural

applications.22.What is a cermet? What are the advantages of cermets? Describe some of its applications.23.How is a glass-ceramic different from a glass and a ceramic? What are the advantages of using

glass ceramics as compared to either glasses or ceramics?24.What is a refractory metal? Describe ceramic refractories and their properties. Discuss basic

refractories, special refractories, Fireclay Refractories and Silica Refractories