Introduction to Metals and Alloys (Leaving Cert Engineering): Flashcards

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Introduction to Metals and Alloys
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Definition of ductility

Ability to be drawn into wires

What are alloys?

Mixtures of a metal with another metal or non-metal element

Main purpose of creating alloys

To enhance properties, increase strength or improve corrosion resistance

What are ferrous metals?

Metals that contain iron as their primary constituent element

What are nonferrous metals?

Metals that do not contain iron as a major component

Most widely used nonferrous metal

Aluminium

Why is copper preferred for electrical wiring?

It is an excellent electrical conductor

Why are alloys stronger than pure metals?

Different sized atoms distort lattice, preventing layers sliding

What element does mild steel contain?

Carbon

What element makes tool steel hard and heat-resistant?

Tungsten

What element makes stainless steel rust-resistant?

Chromium

What is steel?

An alloy of iron and carbon (0.2%0.2\% to 2.1%2.1\% carbon)

Minimum chromium % in stainless steel

10.5%10.5\%

Key property of gold

Highly unreactive with excellent corrosion resistance

What is zinc commonly used for?

Die casting and galvanising steel to protect from corrosion

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