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What Are The Types Of Aluminum-Based Alloys?

wallpapers Resource 2020-11-17
Aluminum alloy is divided into deformed aluminum alloy and cast aluminum alloy according to its composition and processing method. Wrought aluminum alloy is made by first melting and casting alloy ingredients into billets, then plastic deformation processing, and various plastic processing products by rolling, extrusion, stretching, forging and other methods. Casting aluminum alloy is a blank that is directly cast into various parts by sand mold, iron mold, investment mold and die casting method after melting the ingredients.

1. Deformed aluminum alloy

Deformed aluminum alloys are semi-finished aluminum alloys such as tubes, rods, wires and shapes made by various pressure processing methods. According to its use, it can be divided into 5 categories: anti-corrosion aluminum alloy, super hard aluminum, special aluminum, hard aluminum, and forged aluminum.

2. Cast aluminum alloy

Cast aluminum alloy is an aluminum alloy used to directly cast various shapes of mechanical parts. It can be divided into Al-Si series alloy, Al-Zn series alloy and Al-Mg series alloy according to the different main elements added. Each system has its own brand and is more complicated.

3. Difference

The fundamental difference between wrought aluminum alloy and cast aluminum alloy can be illustrated by the phase diagram of aluminum-based binary alloy: the alloy with the composition to the left of point B′ belongs to the wrought aluminum alloy, and when heated to a temperature higher than the solid solution line (BD), it A single-phase α solid solution can be obtained, which has good plastic processing performance and is suitable for cold and hot pressure processing. Due to the development of fusion casting technology, the composition of some deformed aluminum alloys has been expanded to point F. The alloy whose composition is to the right of point E belongs to cast aluminum alloy. Because its structure contains low-melting eutectic, it has good fluidity, can prevent hot cracking, and is suitable for casting. It can be seen that the composition content of cast aluminum alloy is higher than that of deformed aluminum alloy. Aluminum alloys are divided into two types: heat-treatable and non-heat-treatable. The alloy whose composition is to the left of point D, the composition of its solid solution does not change with the change of temperature, there is no phase change during heat treatment, and no strengthening occurs, which is called non-heat treatment strengthened alloy; the alloy composition between DF, its solid solution The composition changes with the temperature, that is, there is a phase change during heat treatment, and thus strengthened, which is called heat-treatable strengthened alloy.

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