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Unit 4.2 Materials
Page 185


1. Complete the map with the correct words.

MATERIALS: CLASSIFICATION AND PROPERTIES

Classification:
• metals
• 1.
• ceramics
• composites
• 2. materials

Mechanical properties: define the ability to 3. external force or 4. changes

• strength
• hardness
• stiffness
• elasticity
• 5.
• plasticity
• malleability
• brittleness

6. properties: refer to the response of materials to thermal 7.
• conductivity
• expansion
• 8. point

Electrical properties: refer to the response of materials to 9.
• conductivity
• resistivity

10. properties: refer to the response of materials to chemical 11. or change
• 12. resistance
• density
2. Match each definition to the correct property.
MalleabilityMelting pointCorrosion resistanceDensityDuctilityHardnessStrengthThermal expansionElectrical conductivityBrittleness
The property of being deformed under compression. →
The temperature at which the material liquefies. →
The ability to conduct electricity. →
The property of resisting oxidation. →
The ability to resist forces without breaking. →
The ability to resist scratches and frictions. →
The property of breaking when the materials are under pressure. →
The ability to be deformed when stretched. →
The tendency to increase size and density when temperature increases. →
The relationship between the mass and the volume of the material. →
3. Listen to the recording and complete the sentences with the missing words.

1. To use a material for products or applications it is fundamental to know its .
2. Toughness is a mechanical property and in particular the ability of a material to and deform plastically .
3. The value of toughness of a material is determined by its .
4. as well as ductility is necessary for good toughness: to be tough a material should be capable of resisting both .