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What is the difference between aluminum alloy and magnesium alloy?

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What is the difference between aluminum alloy and magnesium alloy?

2021-08-06 14:47

Metal has been widely used in China, among which the characteristics and applications of different types of metal are also different. So, what is the difference between an aluminum alloy and a magnesium alloy?

What is aluminum alloy?

Aluminum alloy density is low, but the strength is relatively high, close to or more than high quality steel, good plasticity, can be processed into a variety of profiles, with excellent electrical conductivity, thermal conductivity and corrosion resistance, widely used in industry, the amount of use is second only to steel. Aluminum alloy is one of the most widely used non-ferrous structural materials in industry. It has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry.

What is magnesium alloy?

Magnesium alloys are alloys based on magnesium with other elements added. Its characteristics are: low density (about 1.8g/cm3 magnesium alloy), high strength, large elastic modulus, good heat dissipation, good shock absorption, impact load capacity than aluminum alloy, organic and alkali corrosion resistance. Mainly used in aviation, aerospace, transportation, chemical, rocket and other industrial sectors.

What is the difference between aluminum alloy and magnesium alloy?

1. Different tensile strength

The frame strength made of magnesium alloy material of the same volume is not as good as aluminum alloy. To achieve the frame strength, material thickness and tube length should be increased. Therefore, magnesium alloy has no advantage compared with aluminum alloy in terms of weight.

2. Different fatigue strength

The durability of the same volume magnesium alloy frame is worse than aluminum alloy frame. It is also a fatal flaw of magnesium alloys. With the more times of riding, the more times of stress will occur, and the strength will be significantly reduced, and even the frame life will not exceed 2-3 years. Therefore, professional riders rarely use magnesium alloy frame, and if they use magnesium alloy frame in competition, they will be replaced by discarding it according to the mileage.

3, metal oxidation is different

The periodic table clearly shows that magnesium alloys are more easily corroded by oxidation than aluminum alloys.

4. Different manufacturing costs

Magnesium alloy is an active metal, so the manufacturing equipment and environment have higher requirements, resulting in high manufacturing costs, and the cost performance of the bicycle frame produced is far less than aluminum alloy frame.

5. Different specific gravity density

Magnesium alloy has the advantage of being lighter than aluminum alloy in the same volume.

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