Engineering Materials

Engineering materials are the backbone of modern technology, playing a crucial role in shaping our world. From the smallest microchip to the largest skyscraper, materials science has enabled innovation and progress in various fields. In this article, we'll delve into the world of engineering materials, exploring their properties, applications, and impact on society.

It all begins with some component (Physical substance) of the Earth, organic or inorganic, which can be reduced to create materials useful to civilization.  

This versatile material has several characteristics or properties used to make things which can perform in intended service.

It can be formed into a variety of shapes by engineering processes.

List of the properties which describe different materials:

Shiny – It reflects light

Strong – It won’t break easily

Flexible – It can be bent easily without breaking

Light - It doesn’t weigh much

Heavy – It weighs a lot

Coloured – Has colour

Magnetic – It’s attracted to magnets

Transparent – Something you can see through

Translucent – Something you can partially see through

Opaque – Something you can-not see through

Conductor – It allows heat or electricity to pass through

Insulator – It doesn’t allow heat or electricity to pass through.

The substances which are useful in the field of engineering are called Engineering materials. A particular material selected is on the basis of following considerations;

Ü  Mechanical properties

Ü  Physical properties

Ü  Chemical properties

Ü  Manufacturing properties

Mechanical Properties

Mechanical properties of engineering materials refer to their ability to withstand various types of mechanical loads, such as tension, compression, shear, and impact. Some common mechanical properties include:

Tensile Strength - the maximum tensile load that can be applied before a material fractures

Elasticity - The ability to deform and return to the undeformed shape. This follows

Yield Strength - The load at which the material stops elastically deforming, and starts permanently deforming.

Ductility - the ability of certain materials to be plastically deformed without fracture (pulling).

Toughness - The ability to withstand cracking, as opposed to brittleness

Hardness - the resistance to deformation and forced penetration

Brittleness - the tendency of a material to break before it undergoes plastic deformation

Malleability - the ability of a material to take a new shape when hammered or rolled.

Physical Property

Physical properties of engineering materials refer to their inherent characteristics that can be observed and measured without changing their chemical composition. Some common physical properties include:

1. Density: Mass per unit volume of a material.

2. Melting Point: Temperature at which a material changes state from solid to liquid.

3. Boiling Point: Temperature at which a material changes state from liquid to gas.

4. Thermal Conductivity: Ability of a material to conduct heat.

5. Electrical Conductivity: Ability of a material to conduct electricity.

6. Magnetic Permeability: Ability of a material to support magnetic fields.

7. Optical Properties: Refractive index, reflectivity, and transparency of a material.

8. Crystal Structure: Arrangement of atoms within a material's crystal lattice.

9. Grain Size: Size of crystalline grains within a material.

10. Porosity: Volume fraction of pores or voids within a material.

11. Surface Finish: Roughness or smoothness of a material's surface.

12. Corrosion Resistance: Ability of a material to withstand chemical attack.

13. Wear Resistance: Ability of a material to withstand mechanical wear.

14. Fatigue Strength: Ability of a material to withstand repeated loading cycles.

15. Creep Resistance: Ability of a material to withstand deformation under constant stress.

Chemical Property
Chemical properties of engineering materials refer to their ability to withstand chemical reactions, corrosion, and degradation. Some common chemical properties include:

Reactivity:

1. Chemical Resistance: Ability to resist chemical attack.

2. Corrosion Resistance: Ability to withstand corrosion from environmental factors.

3. Oxidation Resistance: Ability to resist oxidation reactions.

Chemical Stability:

1. Thermal Stability: Ability to withstand high temperatures without degradation.

2. Hydrolytic Stability: Ability to withstand exposure to water.

3. Photostability: Ability to withstand exposure to light.

Chemical Composition:

1. Elemental Composition: Percentage of elements present in the material.

2. Phase Composition: Presence of different phases or compounds.

3. Impurity Content: Presence of unwanted elements or compounds.

Chemical Properties:

1. pH Resistance: Ability to withstand exposure to acidic or basic environments.

2. Solubility: Ability to dissolve in various solvents.

3. Reactivity with Other Materials: Ability to react with other materials.

Manufacturing Properties

Manufacturing properties of engineering materials refer to their characteristics that affect their behavior during various manufacturing processes. Some common manufacturing properties include:

1. Machinability: Ease with which a material can be cut, drilled, or shaped.

2. Weldability: Ability of a material to be joined using welding processes.

3. Castability: Ability of a material to be cast into a desired shape.

4. Formability: Ability of a material to be shaped or formed without breaking.

5. Forgability: Ability of a material to be shaped using forging processes.

6. Workability: Ability of a material to be shaped or formed without cracking.

7. Solderability: Ability of a material to be joined using soldering processes.

8. Brazability: Ability of a material to be joined using brazing processes.

9. Heat Treatability: Ability of a material to be heat-treated to achieve desired properties.

10. Surface Finish: Ability of a material to achieve a desired surface finish.

11. Corrosion Resistance during Manufacturing: Ability of a material to withstand corrosion during manufacturing processes.

12. Toxicity during Manufacturing: Potential health risks associated with a material during manufacturing processes.