{"id":6235,"date":"2024-11-28T01:58:40","date_gmt":"2024-11-28T09:58:40","guid":{"rendered":"https:\/\/richconn.com\/?p=6235"},"modified":"2024-12-09T01:47:44","modified_gmt":"2024-12-09T09:47:44","slug":"magnesium-vs-aluminum","status":"publish","type":"post","link":"https:\/\/richconn.com\/magnesium-vs-aluminum\/","title":{"rendered":"Magnesium vs. Aluminum: 6 Key Differences You Need to Know","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"\n

Not knowing the differences between magnesium and aluminum can lead to bad material choices. Both have their own special properties which impact their cost and behavior. This post will cover their differences and practical use cases so you can make better decision for your next task.<\/p>\n\n\n\n

Magnesium vs. Aluminum _ Overview<\/h2>\n\n\n\n
\"Magnesium<\/figure>\n\n\n\n

Magnesium and aluminum are two lightweight structural metals<\/a> and each has its own advantages in industrial applications. Aluminum<\/a> gives natural resistance against corrosion through its oxide layer while magnesium<\/a> has electromagnetic shielding capabilities and vibration dampening. Also magnesium is the lightest structural metal, 33% lighter than aluminum.<\/p>\n\n\n\n

1. Physical Properties<\/h2>\n\n\n\n

Density and Weight<\/h3>\n\n\n\n

Aluminum has a density of 2.70 g\/cm\u00b3. So it is a lightweight metal but strong enough for most mechanical and structural applications, while magnesium has a lower density of 1.74 g\/cm\u00b3 and is 34% lighter than aluminum.<\/p>\n\n\n\n

Melting and Boiling Points<\/h3>\n\n\n\n

Aluminum has a boiling point of 2519\u00b0C and melting point of 660\u00b0C and needs greater processing temperatures. While in contrast, magnesium has boiling point of 1090 \u00b0C and melting point of 650 \u00b0C which is much lower than aluminum.<\/p>\n\n\n\n

2. Mechanical Properties<\/h2>\n\n\n\n

Strength and Stiffness<\/h3>\n\n\n\n

Aluminum alloys have a tensile strength of 70\u2013700 MPa and magnesium alloys have tensile strengths of 120-420 MPa. Some variants of magnesium like cast and wrought have tensile strengths of 280 MPa and 360 MPa. Moreover, magnesium has lower stiffness with modulus of elasticity of 45 GPa as compared to aluminium which has 68-70 GPa elasticity.<\/p>\n\n\n\n

Strength-to-Weight Ratio<\/h3>\n\n\n\n

Magnesium has higher strength-to-weight ratio (158 kN\u00b7m\/kg) than aluminum (130 kN\u00b7m\/kg). Although aluminum has more absolute strength, magnesium\u2019s lighter weight makes it better in weight critical structural applications.<\/p>\n\n\n\n

Corrosion Resistance<\/h3>\n\n\n\n

Aluminum forms a 5-10 nm inert oxide layer naturally that protects against environmental corrosion. Except saltwater, this self-healing barrier makes aluminum corrosion resistant in most environments. On the other hand, magnesium is more reactive and needs particular surface treatments or coatings to avoid corrosion, especially in saline or humid situations.<\/p>\n\n\n\n

Machinability and Formability<\/h3>\n\n\n\n

Aluminum is machinable but can form gummy buildup because of its soft nature and low melting point. It needs sharp tools and fast cutting speed for better performance. Magnesium, on the other side, is machinable with lower cutting forces and generates less tool wear but requires special handling for fire safety.<\/p>\n\n\n\n

Aluminum provides outstanding plastic deformation abilities while magnesium has poor pla<\/u><\/a>s<\/a><\/u>ticity<\/u><\/a> at room temp and needs to be heated above 250\u00b0C for forming.<\/p>\n\n\n\n

3. Thermal and Electrical Conductivity<\/h2>\n\n\n\n

Aluminum has thermal conductivity of 237 W\/m\u00b7K and an electrical conductivity of 37.7 MS\/m. In contrast, magnesium has lower but still good enough thermal conductivity value of 156 W\/m\u00b7K and an electrical conductivity of 22 MS\/m. This is due to aluminum\u2019s more dense atomic structure and magnesium\u2019s hexagonal crystal structure.<\/p>\n\n\n\n

4. Applications<\/h2>\n\n\n\n

Magnesium and aluminum are both used across many industries like:<\/p>\n\n\n\n

Aerospace Industry<\/h3>\n\n\n\n

Aluminum is broadly used in aerospace for up to 80% of aircraft structures, particularly in the construction of wing parts and fuselage components.<\/p>\n\n\n\n

Magnesium is used in electronic housings, helicopter transmission casings and engine frames where its lower density is important for weight reduction.<\/p>\n\n\n\n

Electronics and Consumer Goods<\/h3>\n\n\n\n

Aluminum is used to make computer cases, LED lighting frames and heat sinks. On the other side, magnesium is used in smartphone frames, laptop chassis and camera bodies for EMI shielding and heat dissipation. Both metals enable ultra-thin device designs with robust protection.<\/p>\n\n\n\n

Construction and Architecture<\/h3>\n\n\n\n

Aluminum is used in making windows, roofing systems, facades and structural frames with 80+ years service life. In contrast, magnesium is used in prefabricated panels, formwork systems and modular construction elements, there it gives outstanding strength-to-weight ratio for rapid assembly applications.<\/p>\n\n\n\n

Packaging Industry<\/h3>\n\n\n\n

Because of its high corrosion resistance and formability, aluminum is used in food packaging, aerosol cans and beverage containers.<\/p>\n\n\n\n

While magnesium has limited packaging applications due to reactivity concerns, mainly used in high-end equipment containers and special protective cases.<\/p>\n\n\n\n

Automotive Industry<\/h3>\n\n\n\n

Aluminum is preferred for making chassis components, radiators, engine blocks, body panels and wheels. But magnesium is used in steering wheels, transmission cases, instrument panel structures and seat frames.<\/p>\n\n\n\n

5. Cost Considerations<\/h2>\n\n\n\n

Currently magnesium ingots are trading between $2,000 and $3,000 per ton, while aluminum price range is between $1,600 and $2,874 per ton in global market. Although magnesium is more expensive, its strength-to-weight ratio can justify the cost in weight critical applications.<\/p>\n\n\n\n

6. Environmental Impact and Sustainability<\/h2>\n\n\n\n
\"Environmental<\/figure>\n\n\n\n