Understanding Metal Properties and Structures

What is the term for the regular, repeating arrangement of atoms in metals?

• Amorphous structure

• Crystalline lattice

• Polymer chain

• Ionic bond

Which of the following is NOT a type of crystal structure found in metals?

• Face-Centred Cubic (FCC)

• Body-Centred Cubic (BCC)

• Hexagonal Close-Packed (HCP)

• Tetrahedral Close-Packed (TCP)

How does the arrangement of atoms in a crystalline lattice affect a metal?

• It determines the metal's colour only

• It affects the metal's properties such as strength and ductility

• It has no effect on the metal's properties

• It only affects the melting point

What is alloying?

• Heating a metal until it melts

• Adding other elements to a base metal to create alloys with desired properties

• Cooling a metal rapidly to harden it

• Removing impurities from a metal

Which of the following is an example of alloying?

• Adding carbon to iron to produce steel

• Melting aluminium

• Polishing copper

• Cooling gold slowly

What do phase diagrams show?

• The electrical conductivity of metals

• The stable phases of a material at different temperatures and compositions

• The colour changes of metals when heated

• The rate of corrosion in metals

Why are phase diagrams important in metallurgy?

• They help in understanding and controlling the properties of alloys

• They show the cost of metals

• They predict the weather

• They measure the density of metals

Which strengthening mechanism involves reducing the size of crystalline grains?

• Work hardening

• Grain boundary strengthening

• Precipitation hardening

• Solid solution strengthening

What is the main purpose of solid solution strengthening?

• To increase the melting point of a metal

• To add solute atoms to the base metal to impede dislocation movement

• To make the metal more brittle

• To change the colour of the metal

Which process increases the strength of a metal by plastically deforming it?

• Precipitation hardening

• Work hardening

• Grain boundary strengthening

• Annealing