If the cooling process is carried out on aluminum alloy and given slowly warming up to get a solid solution that is thorough, then on medium-Quenching in water or oil will not happen but it would result in the precipitation of a solid solution is saturated.
The temperature and duration of time required for the “treatment solution” will depend on the elemental composition of the alloy itself. From the end of the heat treatment will produce the form of soft aluminum alloy and soft so that it can be done with a cold working process.
1. The deposition process
Saturated solution of the solid solution obtained by dissolving process will only stable at low temperatures, so that when the heating process is carried further, or the so-called precipitation-treatment in which the occurrence of the deposition process needs heating temperature is not too high.
Elements of copper or other alloy elements will not leave a solid solution but will only form a high population areas (High-Population), therefore the voltage will increase.
The degree of warming temperatures will also depend on the elemental composition of the aluminum alloy itself, as well as the duration of time required, as well as the elemental composition of the alloy depends on the size of the thickness must also be considered, the average heating temperature is usually given between 100) C to 2000C with a heating time between 2 to 30 hours.
Instructions should be adhered to in this process because of errors of procedure implementation can lead to its reduced strength of the material itself even more so if the high-temperature heating or heating terlalui too long.
2. Natural Ageing
In some cases various types of hard alloys undergo deposition and room temperature is still too high to help the deposition process, therefore it is necessary for sufficient time for at least 30 minutes and then settled in full within 4 days maximum voltage that can be achieved. Aluminum alloy with copper content up to 4% or better known as “Duralumin” is a form of aluminum alloy with the “Natural Ageing” Alloy.
If this Aluminum Alloy will be formed through cold working process should be performed within 2 hours after Quenching, because if past the deadline will be extended so that the deposition would be difficult to do with this process.
Deposition process may wait up to 4 hours if it is done in the refrigerator with a temperature between-60C to-100C, thus resulting solution will be perfect and this alloy can be stored until needed construction. One of the products that use materials of the type and the treatment of, among others, are rivets.
3. Annealing In Aluminum alloy
Annealing process can be performed on all types of aluminum alloy forgings that this alloy can be formed through cold working process. Annealing temperature is determined by the recrystallization of aluminum alloys temperaur itself, however, is usually given between 3400C to 4500C with a heating time between 20 minutes to 2 hours depending on the composition and size of the thickness of the material.
The most important thing to consider in the process of Aluminum Annealing on this is should not give excessive heating due to Temperature will grow all the grain so that it will reduce the mechanical properties of these materials After this process is done.
4. Stabilizing Treatment
Very often in the heat treatment on various types of metal materials in which the effect of heat treatment on the stress in aluminum formed primarily through the workpiece casting and allowed to cool in the mold (Mould), this is the case also in the process of large extrusi and large forgings. To overcome this workpiece can be done with the heating temperature 2000C with a time of 5 hours or according to the size of the thickness of the workpiece.
5. Completeness
Pemamanas kitchen is one of the main completeness heat treatment. Similarly, for the purposes of annealing process on the aluminum alloy. Kitchen heaters are used in this process should use the kitchen air circulation while it is actually all kinds of kitchen heaters can be used, but the kitchen air circulation is recommended for use on aluminum alloys annealing process and the deposition process.
Kitchen Salt-bath can also be used, but the use of the kitchen materials that will be treated should be coated with grace and dried before it is inserted into the puddle, then washed with clean water to remove the remnants of salt in order to avoid the damage caused by the chemical reaction of the salt.
6. Fabrication of aluminum and aluminum alloys
Commercially pure aluminum and wrought aluminum alloys can be manipulated into various shapes through rolling, deep drawing, pressing, forming stetch, as well as the impact extrusing extrusing stamping and bending. For Aluminum alloys can be formed through the process of casting in sand molds (Sand Casting), other die-casting and machining process lain.Pembentukan through (machining) required a high cutting speed and accurate determination of the cut angle of the cutting tool used.
Grafting can be done through welding Aluminum using fluxi actif to remove oxide films, whereas connection with soldering and brazing can only be done on pure Aluminum or Aluminum certain types of known type. Splicing Aluminum can also be done mechanically with rivet (rivet) and connecting with bolts.
Aluminum can be done with the finishing and polishing or burnishing by Chemical finishing anodizing through the thickening layer of the paint films oxid after anodic process of finishing or electroplating chemical after appropriate surface preparation. The corrosion resistance of aluminum alloys can be improved by rolling to provide a layer of pure aluminum on each side which resulted in “three-effect”.