Alloys whose main metal is aluminum are called "Aluminum Alloys". They are also called light alloys. Aluminum alloys include iron, zinc, silicon, manganese, magnesium, nickel, copper, titanium, etc. formed by adding elements.
Features;
- Good conductor of heat and electricity
- Being prone to heat treatments
- Suitable for casting
- to be light
- Resistant to chemical effects
- It can be used as a preservative in foodstuffs and pharmaceutical industry because it is corrosion resistant and does not pose a poisoning hazard.
Partitioning of Aluminum Alloys
Various aluminum alloys are prepared according to the requirements of the places of use.
Casting Alloys
Non-Heat Treatable Aluminum Alloys
Aluminum – Zinc – Copper – Silicon Alloys
Aluminum – Copper Alloys
Aluminum – Silicon Alloys
Aluminum–Magnesium Alloys
Modification
Modification, in other words, thinning is done by adding 0.01% sodium in aluminum silicon alloys. Strontium is also used for the same purpose.
Grain Refinement
Grain refinement is performed by adding aluminum titanium boron pre-alloys (Al-Ti-B) to liquid aluminum. It provides the improvement of mechanical properties.
Casting Properties of Aluminum Alloys
Flowability and shrinkage are important casting properties.
Fluency
It is fluidity when the liquid metal completely fills the mold cavity.
The following factors affect fluency.
The shape of the poured part The composition
of the metal and its temperature . Pure aluminum has less fluidity.
Do not Pull
Shrinking means shrinking in volume. This feature is more in aluminum. Shrinkage is reduced by alloying, but aluminum alloys still have higher shrinkage than other metals.
Melting Aluminum Alloys
Management of Melting
It is necessary to avoid the danger of oxidation and gas absorption in the melting of aluminum and its alloys.
For this reason, it is necessary to pay attention to the following points in melting:
Liquid metal should not be mixed
Overheating should be avoided especially
The tools used should be very clean The
metal temperature should be measured with a pyrometer
Liquid metal should be poured immediately
