Aluminium: The Material of Choice Across Industries
Aluminium has become one of the most widely used materials across numerous industries and in CNC machining. Its popularity over other metals stems from its outstanding mechanical properties and versatility. If you'd like to learn about the top three aluminium alloys, keep reading as GNEE presents all the essential details.
Features and Properties of Aluminium Alloys
Aluminium is a metallic material that typically appears silver or matte grey, depending on its surface finish.
One of the key reasons aluminium is used in so many industries is its combination of lightness, ductility, and malleability.
Other notable properties of leading aluminium alloys include:
Affordability
Softness and formability
Excellent durability
Strong corrosion resistance
Melting point around 640°C
Density of 2.68 g/cm³
Outstanding heat and electrical conductivity
Increased strength at sub-zero temperatures
Non-magnetic and non-flammable characteristics
However, aluminium alloys also have a few limitations to keep in mind:
Copper offers superior heat and electrical conductivity.
Some alloys lose strength when exposed to high temperatures above 200–250°C (392–482°F).
Now that we've covered the basics, let's look at the top three aluminium alloys recommended by GNEE.
Top 3 Aluminium Alloys
Among the many aluminium alloys available today, three stand out for their performance, versatility, and application range: Aluminium 7075, Aluminium 5083, and Aluminium 6082. Let's explore each one in detail.
Aluminium 7075
Aluminium 7075 is well-known for its exceptional fatigue strength and better corrosion resistance than the 2000 series alloys. In most machining operations, oil-based lubricants are used for optimal results.
The primary alloying element in 7075 is zinc, which gives it a remarkable combination of strength and toughness suitable for many high-performance applications.
However, it's important to note that 7075 aluminium is not easily weldable and can be more expensive than other grades.
Main Properties of Aluminium 7075:
High strength, comparable to certain grades of steel
Excellent fatigue strength
Moderate machinability in the annealed condition
Applications:
7075 aluminium is ideal for applications requiring lightweight components with maximum strength and high dimensional accuracy.
Typical uses include:
Automotive parts
Aerospace components
Medical devices
Bicycle parts
Rock-climbing equipment
Due to its cost, it's best used when your project demands the specific performance characteristics of this alloy.
Possible Treatments After Machining:
Heat treatment
Annealing
Aging
(Note: 7075 aluminium is not suitable for anodizing after machining.)
Aluminium 5083
Aluminium 5083 stands out for its exceptional performance in harsh environments, especially where exposure to seawater and chemical agents is common.
It maintains excellent strength even after welding, making it one of the best choices for marine and industrial applications. It is recommended for continuous use at temperatures up to 65°C.
Key Properties of Aluminium 5083:
High corrosion resistance in marine environments
Excellent ductility and formability
Low density
Superior thermal conductivity
Excellent weldability
Applications:
Thanks to its strength and corrosion resistance, Aluminium 5083 is widely used in:
Shipbuilding and marine structures
Railcars
Vehicle and truck bodies
Mining skips and cages
Pressure vessels
Telecommunication towers
When your project involves corrosive or marine environments and requires high mechanical strength, Aluminium 5083 is an excellent choice.
Possible Treatments After Machining:
Annealing
Strain hardening
Strain hardening and stabilization
Anodizing
Aluminium 6082
Aluminium 6082 is recognized for its superior strength compared to most alloys in the 5xxx series. It's the strongest alloy in the 6xxx series and is often referred to as a structural aluminium alloy due to its common use in load-bearing applications.
Its impressive strength and corrosion resistance come from a high manganese content, which refines the grain structure and improves stability.
However, thin walls and complex shapes can be challenging to produce with this alloy, and welded areas tend to lose strength. Despite this, Aluminium 6082 is an excellent alternative to low-carbon steels, particularly where corrosion resistance is critical.
Applications:
Common uses for Aluminium 6082 include:
High-stress structures
Cranes and lifting equipment
Transport vehicles
Ore skips
Beer barrels and milk churns
Bridges and trusses
Possible Treatments After Machining:
Annealing
Aging
Anodizing
Final Words
There you have it-the top three aluminium alloys with their key properties and typical applications.
With this information, you'll be better equipped to choose the right aluminium alloy for your specific project.
Still unsure which one suits your needs best? GNEE's team of aluminium experts is here to help. Contact us today, and we'll be glad to guide you toward the ideal solution for your application.
