1.2c Alloys Flashcards
What is an alloy?
Metal made by combing two or more metallic elements
Why are metals alloyed?
To improve the properties
E.g. Harder, more corrosion resistant, improve machining characteristics
Name 3 alloys
Stainless steel
Duralumin
Brass
What are the composites of stainless steel?
Steel
Chromium (18%)
Nickel (8%)
What are the composites of duralumin?
Aluminium (94%)
Copper (4%)
Manganese (1%)
Magnesium (1%)
What are the composites of brass?
- Copper (65%)
- Zinc (35%
What are three advantages of stainless steel?
- Tough
- Hard
- Corrosion resistant
What are three advantages of duralumin?
- Lightweight
- Ductile
- Strength increases when worked
What are four advantages of brass?
- Corrosion resistant
- Casts well
- Easily machined
- Good conductor of electricity
What are the disadvantages of stainless steel?
Expensive
Hard to cut
What is the disadvantage of duralumin?
Work hardens
What are the disadvantages of brass?
Susceptible to cracking when cold worked
Needs to be annealed
Give 3 uses of stainless steel
Kitchen utensils
Pipes
Medical tools
Give 2 uses of duralumin
Aviation industry
Automobile industry
Give 3 uses of brass
Central heating valves
Electrical components
Ships propellors
