6.2 Flashcards
What is a non-ferrous material
Describes materials that have elements other than iron as their base.
Non-magnetic.
Aluminium, copper, titanium, magnesium.
What are the two types of aluminium alloy
Wrought
Cast
What is aluminium ore called
Bauxite
What do the digits mean in the 4 digit index system for aluminium alloys
1st digit= main alloying element
2nd digit = indicates modification
What alloying element is ment by the 1st digit designators. 1XXX 2XXX 3XXX 4XXX 5XXX 6XXX 7XXX 8XXX 9XXX
1 - pure aluminium
2 - copper
3 - manganese
4 - silicon
5 - magnesium
6 - silicon and magnesium
7 - zinc
8 - other elements
9 - unused series
Clad aluminium alloys
Aluminium alloys are clad with pure aluminium to increase corrosion resistance.
Particularly certain alloys (2024 and 70750)
Approx. 3-5% of its thickness
Most popular magnesium allloy
AZ31
Aluminium 3%
Zinc 1%
Disadvantages of magnesium
Susceptible to corrosion
Cracks easily
Burns readily
What are titanium alloys used for
Bolts, fasteners, firewalls, engine compressors, compressor blades
Advantages of titanium alloys
Heat resistant
Alpha alloys are strong
Alpha-beta alloys are medium strong when annealed
Common nickel alloys and their alloys
Monel
- gears and exhaust systems as high strength and toughness and work well at high temps
Inconel
- can be found in turbine engines due to high strength
Common copper alloys
Used in wiring
Bronze
Brass
Beryllium
Types of heat treatment of aluminium alloys
Solution heat treatment
Precipitation heat treatment
What is solution heat treatment of aluminium alloys
Heat in a salt bath or oven just below melting point. Soak
Quenched within 10 secs
What is precipitation heat treatment of aluminium alloys.
Either naturally age or artificially age.
