Products made from aluminum and its alloys are mostly popular for their strength-to-weight ratio, corrosion resistance, and strength. The majority of the alloys are easy to weld, CNC machine, and take through different forms of fabrication. Their recyclability is also resonating well with the present mantra of environmental sustainability.

While these are desirable attributes for anyone looking for metal to use, they are general. When it comes down to a specific material, the qualities of an aluminum alloy can differ, even if slightly. That’s the case for aluminum 7005 and aluminum 7075. If you are torn between these two alloys or just want to learn about them, this post is for you.

We will look at the main properties of the 7075 and 7005 aluminum alloys, including chemical composition, physical properties, mechanical properties, applications, and the comparison of all these.

7075 aluminum is a popular aluminum alloy from the 7000 series that we produce at the Fonnov Aluminum facility. It is extremely strong and relatively easy to machine, especially when you compare it with high-strength steel. Considering its superior strength, it is understandable why most of its applications are where strength is paramount. You will therefore find it in the aerospace and defense industries, as well as in other high-strength structures. Its rich concentration of zinc element is a key contributor to the characteristics we witness. Note that this alloy has a high strength-to-weight ratio, so it is perfect for areas where this combination of properties is needed.

Chemical Composition of 7075 Aluminum

For aluminum 7075, the components are magnesium 2.1-2.9 %, zinc 5.1-6.1%, Copper 1.2-2.0%, and Iron 0.50. The silicon and manganese contents are 0.40% and 0.30% respectively. Aluminum 7075 also contains smaller components of Titanium and Chromium among others. Similar to aluminum 7005, the rest of the composition is aluminum.

ALUMINIUM ALLOY Si Fe Cu Mn Mg Cr Zn Ti Zr Others Al
7075 0.40 0.50 1.2-2.0 0.30 2.1-2.9 0.18-0.28 5.1-6.1 0.20 —— totally 0.15 remainder

✣All compositions are in percent.

Physical Properties of 7075 Aluminum

Hardness: Higher hardness compared to 7005 aluminum

Resistance to fatigue and impact: Resists fatigue loading and impact loads well

Yield strength: High yield strength

Corrosion resistance: Good corrosion resistance but the high content of zinc can hinder this property

Common Applications of 7075 Aluminum

Industrial Components: Excellent strength in harsh conditions makes the alloy ideal for the manufacture of pistons and related components.

Military Equipment: Equipment in this industry needs to be strong in difficult terrains; 7075 aluminum makes a perfect solution.

Aerospace Parts: Frames and other parts need to be lightweight and strong, a property that is synonymous with 7075 aluminum.

Tooling: Tools in manufacturing require rigidity and toughness, properties that this aluminum alloy offers.

What is 7005 aluminum?

Aluminum 7005 is a 7000 series aluminum alloy that has good properties such as corrosion resistance, strength-to-weight ratio, and heat resistance. This metal comprises of elements that make it strong, to add to other capabilities. Like the other alloys in this series, aluminum 7005 has a significant amount of zinc, which contributes a lot to the properties. Since it is a fairly strong material, you can expect this alloy in applications where strength is one of the requirements. As you would expect with an aluminum alloy of such good qualities, it is one of the products you can expect to find at the FONNOV Aluminum extrusion and fabrication plants.

Chemical Composition of 7005 Aluminum

The components of aluminum 7005 aluminum are 0.35% Silicon, 0.4% Iron, 0.10 % Copper, and 4.0-5.0 % Zinc. Its magnesium content is around 1.8 %. It also has small traces of Titanium, Chromium, and Manganese among others. The largest proportion of the alloy is aluminum. These components combine to create a strong and corrosion-resistant aluminum alloy.

ALUMINIUM ALLOY Si Fe Cu Mn Mg Cr Zn Ti Zr Others Al
7005 0.35 0.40 0.10 0.20-0.70 1.0-1.8 0.06-0.20 4.0-5.0 0.01-0.06 0.08-0.20 totally 0.15 remainder

✣All compositions are in percent.

Physical Properties of 7005 Aluminum

Strength: Extrusions from 7005 aluminum are strong, but not to the level of 7075 aluminum

Machinability: The alloy has relatively good machinability

Corrosion resistance: It presents good corrosion resistance

Fatigue resistance: Has good fatigue resistance due to magnesium and zinc elements. This is an attractive feature considering the balance it creates with other elements such as corrosion resistance. Therefore, it handles cyclic loads very well – automotive components, bicycle frames, etc.

Formability: While not as formable as aluminum 3003, aluminum 7005 has good formability when compared to aluminum 7075.

Common Applications of 7005 Aluminum

Outdoor products: The alloy’s excellent corrosion resistance is a big advantage in outdoor equipment that feature extrusions that must beat the harsh and corrosive outdoor environment

Machine frames/extrusions: It is strong and easy to machine, hence a good option for manufacturers of machines that feature strong frames.

Bicycle Industry: With its magnesium and zinc components, aluminum 7005 is strong enough to give good performance in high-stress situations encountered by bicycles. It has good fatigue resistance, yet it is lightweight, therefore it has the perfect blend of qualities for this application.

What are the differences between aluminum 7075 and 7005?

Comparison of general properties of aluminum 7075 vs. 7005

Aluminum 7075 Aluminum 7005
Alloy is mostly made up of aluminum, zinc, copper, magnesium, and small amounts of other elements. The alloy mainly comprises aluminum (Al), zinc (Zn), magnesium (Mg) plus a small portion of other elements
Structural grade material Structural grade material
Very strong material Structural grade material
High strength-to-weight ratio, low density compared to other structural metals. Higher density compared to aluminum 7005 Good strength-to-weight ratio, low density compared to other structural metals
Corrosion resistance is not very good Excellent corrosion resistance
Not easy to machine or weld Easy to weld but challenging to fabricate
Mostly suited for high-strength applications It is a versatile alloy with a balance of properties. Used across different applications

Aluminum 7075 vs. 7005: Comparison of Mechanical Properties

Aluminium Alloy & Temper Thickness

mm

Tensile Strength
Rm/Mpa
Yield Strength
Rp0.2/Mpa
Elongation /%

A

HBW
7075-T6  T6510  T6511 ≤25.00 530 460 6 150
>25.00-60.00 540 470 6 150
7075-T73  T73510  T73511 ≤25.00 485 420 7 135
7075-T76  T76510  T76511 ≤6.00 510 440
>6.00-50.00 515 450 6
7005-T5 ≤25.00 345 305 10
7005-T6 ≤40.00 350 290 10 110

✣The tested value is Min.

7075 vs. 7005: Hardness Comparison

Aluminum 7075 is relatively hard. On the Brinell hardness scale, it scores about 150 HB. This level shows that the material can tolerate deformation and wear. This property comes in handy in the structural applications of the alloy, particularly when it combines with the high strength-to-weight ratio.

For aluminum 7005, the Brinell hardness performance can vary based on the specific alloy temper. For instance, aluminum 7005-T6 has a Brinell hardness of about 110 HB.

7075 vs. 7005: Comparison of Applications

Generally, 7000 series alloys are tough, hence they are ideal for demanding applications where strength and other critical requirements dominate. The extreme conditions of the aerospace industry are probably the most popular destination for these alloys. However, that’s not to say that the applications for aluminum 7005 and aluminum 7075 are the same.

The main differentiating line is that while 7005 works perfectly with welding, 7075 aluminum is relatively poor with welding. You can see this difference in the main applications for the two alloys. For instance, 7005 aluminum is prominent in the manufacture of bicycle frames. A lot of welding is involved in these strong items, so this alloy comes in handy.

For its exceptional strength and durability, aluminum 7075 is common in the manufacture of military and aerospace components. Our extrusions of this metal are also useful in the manufacture of various transportation parts.

Aluminum 7075 vs. 7005: Price Comparison

There is a price difference between aluminum 7005 and aluminum 7075. Aluminum 7075 extrusions are likely to cost more than those of 7005 no matter the profile or shape in question.

The mechanical properties of the two alloys play a big role in the price disparity. Aluminum 7075 is among the strongest alloys, hence its demand for high-stress applications. Because of this special application, the material is bound to be expensive.

While also strong, 7005 aluminum does not reach the strength of 7075 aluminum. It does have a good balance of several properties though, but the price is still lower than that of 7075 aluminum.

The process to get a material of the caliber of 7075 aluminum is relatively complex and pricey. As for 7005 aluminum, the manufacturing process is less demanding and therefore more affordable.

Which one should you buy, Aluminum 7005 or 7075?

When you have to choose between aluminum 7005 and 7075, the question would be about your specific application. The needs of this application would guide on which of the two alloys is better.

Consider the amount of strength needed in the application. Aluminum 7075 is perfect for applications requiring significant strength. If the strength requirements are less but other properties such as corrosion resistance are crucial, 7005 is a better choice.

Another consideration would be the ease of working with the material, in this case, the machinability. If you want an alloy that you can machine more easily and faster, 7005 aluminum is better.

By carefully analyzing these factors, you identify an alloy that suits your application through cost-effective and functional results.

FONNOV ALUMINIUM is a leading aluminum extrusion manufacturer in CHINA. If you are requiring the 7075 aluminum extrusions and 7005 aluminum extrusions, we will be your best choice for your project. 

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