The difference between 6063 and 6061 aluminum alloy?

19. October 2023

1. Differences in chemical composition

Trace element W%  Aluminum content: balance 
  Silicon Si Iron Fe Cu Manganese Mn Magnesium Mg Zinc Zn Metal Ti Chromium Cr
6061 0.4-0.8 0.7 0.15-0.4 0.15 0.8-1.2 0.25 0.15 0.04-0.35
6063 0.2-0.6 0.35 0.1 0.1 0.45-0.9 0.1 0.1 0.1

The 6-series aluminum alloys are medium-strength heat-treatable alloys. Magnesium has a significant effect on strengthening aluminum alloys, and zinc and copper also have obvious strengthening effects on aluminum alloys.

As can be seen from the above table, 6061 has more alloying elements than 6063. From the content of magnesium and silicon, about 6061 is 30-50% more than 6063. The most direct impact is that the strengthening effect of 6061 is greater than that of 6063.

2. The difference in mechanical properties

material Tensile strength (MPa) Tensile strength (MPa) Hardness (HB)
6061-T6 310 275 95
6063-T5 185 145 60
6063-T6 230 180 70

We can see from the chemical composition that the trace element content of 6061 is higher than that of 6063. As a 6-series alloy with magnesium and silicon as the main elements, Mg and Si form the strengthening phase Mg2Si. The higher the content of magnesium and silicon, the greater the amount of Mg2Si, and the greater the strengthening effect of heat treatment.

On the contrary, the higher the tensile strength, the higher the deformation resistance, so the plasticity of the alloy will decrease.

Therefore, according to the design value of the tensile strength of the T5 profile, the content of magnesium and silicon should be fine-tuned appropriately to reduce the tensile strength to obtain better plasticity, especially for profiles with complex sections.

3. Comparison of Plasticity

6061-T6 is used in occasions that require a certain strength and hardness. 6063 is a representative alloy for extrusion and has good extrudability.

Especially 6063-T5 has excellent thermoplasticity, and can be extruded into various profiles with complex structures (such as thin-walled and hollow ) at high speed or forged into forgings with complex structures. It has a wide quenching temperature range, low quenching sensitivity, and extrusion After pressing and forging demoulding, as long as the temperature is higher than the quenching temperature. That is, it can be quenched by spraying water or piercing water.

4. Other comparisons

Surface treatment: 6061 and 6063 have good oxidation performance. The surface adhesion of 6063 aluminum alloy is slightly higher than that of 6061 aluminum plate, so the oxidation ability is extremely strong.

Machinability: Good overall, 6061 is better.

Corrosion resistance: generally very good, 6063 is slightly better.

Weldability: All can be welded, 6063 is slightly better.

Price: The price of the two is about the same, currently 6063 is slightly more expensive.


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