6061 and 6063 aluminum both belong to the 6000 series aluminum alloy, which means they are primarily alloyed with magnesium and silicon. However, there are still some differences in their chemical composition, mechanical properties and application areas.
Aluminum 6061 vs 6063
| Composition | 6061 | 6063 | ||
| Aluminum | 95.8 – 98.6% | <=97.5% | ||
| Chromium | .04-.35% | <=.10% | ||
| Copper | .15-.4% | <=.10% | ||
| Iron | <=.7% | <=.35% | ||
| Magnesium | .8-1.2% | .45-.90% | ||
| Manganese | <=.15% | <=.10% | ||
| Silicon | .4-.8% | <=.2-.6% | ||
| Titanium | <=.15% | <=.10% | ||
| Zinc | <=.25% | <=.10% | ||
When comparing the thermal conductivity of Aluminum 6061 and 6063, here are the key points:
Thermal Conductivity
Summary
The difference in thermal conductivity is mainly due to the slightly different alloy compositions, particularly the silicon and magnesium content.
| Mechanical Properties | 6061 Aluminum | 6063 Aluminum | ||
| Property | T4 6061 | T6 6061 | T4 6063 | T6 6063 |
| Brinell Hardness | 65 | 95 | 46 | 73 |
| Tensile Strength | 35,000 psi | 45,000 psi | 25,000 psi | 35,000 |
| Yield Strength | 21,000 psi | 40,000 | 13,000 psi | 31,000 |
| Modulus of Elasticity | 10,000 ksi | 10,000 ksi | 10,000 ksi | 10,000 ksi |
| Shear Modulus | 3,770 ksi | 3,770 ksi | 3,740 ksi | 3,740 ksi |
| Shear Strength | 24,000 psi | 30,000 psi | 16,000 psi | 22,000 |
| Anodization Reaction | Good | Good | Good | Good |
6061 aluminum is favored for its high strength and versatility, especially in structural applications, while 6063 aluminum is favored for its excellent surface finish and corrosion resistance, making it ideal for architectural uses.
6061 aluminum has a lower melting temperature, lower thermal conductivity, and lower heat capacity.
AL 6061-T6 has higher yield strength and fatigue strength than AL-T6 6063.
It also has poorer corrosion resistance than AL 6063.
6063 aluminum has a higher melting temperature, higher thermal conductivity, and higher heat capacity than AL 6061.
AL 6063 has a better surface finish than AL 6061, making it more suitable for architectural uses.
If the aluminum products you’re selecting will be on display or exposed to the elements, you’ll want to choose alloy 6063. The alloy’s corrosion resistance and aesthetics make it much more suited for these uses. Given its extrudability, aluminum 6063 is also widely available for all types of applications and in all kinds of shapes.
For example, aluminum pieces for retail displays and organizing are commonly made from 6063, including:
Because of 6063’s extrudability, it’s compatible with far more shapes that require fine details, such as 90o angles and T-slot quad tracks.
6061 is an aluminum alloy of choice if you’re using the product to bear significant weight or require guaranteed reliability and sound structures.
As a result, its extrusions are commonly found as shapes readily suited for making or adding support (e.g., legs for shelving):
Through the above series of analysis, although 6061 and 6063 aluminum alloys both belong to the 6000 series aluminum alloys, there are still certain differences in performance.
6061 aluminum alloy is preferred in application environments with high strength requirements.
If the product surface effect is required to be high, or stronger corrosion resistance is required, 6063 aluminum alloy can be selected.
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