📖 Composition & Properties of Alloys

An alloy is a homogeneous mixture of a metal with other metals or non-metals. Alloying enhances properties such as hardness, tensile strength, and resistance to corrosion compared to pure metals.

NameCompositionPropertiesUses
Stainless SteelFe, C, Cr, NiResists rusting, very hardCutlery, surgical instruments
BrassCu (60-70%), ZnMalleable, attractive yellowUtensils, electrical fittings
BronzeCu (80%), Sn, ZnHard, highly resistant to corrosionStatues, medals, coins
DuraluminAl (95%), Cu, Mg, MnLightweight but highly strongAircraft parts

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⚠️ Safety

  • Wear safety goggles when striking metal — chips or fragments can fly off.
  • Keep fingers clear of the hammer's path; strike on a firm, stable surface.
  • Metal edges and filings are sharp — handle samples with care and clear up filings.
  • Corrosion is set up with moist air / dilute salt solution; wash hands after handling metal salts.
Pure Metal Alloy
Iron (Fe) Stainless Steel
Lab Journal
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