The key difference between aluminum and magnesium is that the aluminum is a corrosion resistant metal whereas the magnesium is not. As a solid absorbs energy in the form of heat, its temperature rises and its dimensions increase. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. When trying to decide between magnesium versus aluminum, the choice is yours. Magnesium alloys are used for parts that operate at high speeds and thus must be light weight to minimize inertial forces. Although Magnesium is lighter than Aluminum. It’s often combined with other elements, including aluminum, to create a lighter alloy. Commercial applications include hand-held tools, laptops, luggage, and ladders, automobiles (e.g., steering wheels and columns, seat frames, transmission cases). Main purpose of this website is to help the public to learn some interesting and important information about materials and their properties. ISBN 978-0-691-07097-1. Materials are frequently chosen for various applications because they have desirable combinations of mechanical characteristics. For vapors, it also depends upon pressure. Ultimate tensile strength is often shortened to “tensile strength” or even to “the ultimate.”  If this stress is applied and maintained, fracture will result. An Introduction to Materials Science. That is, the penetration depth and hardness are inversely proportional. Another great benefit of aluminum is that it is anti-corrosive. The major load is applied, then removed while still maintaining the minor load. Aluminium alloys containing alloying elements with limited solid solubility at room temperature and with a strong temperature dependence of solid solubility (for example Cu) can be strengthened by a suitable thermal treatment (precipitation hardening). Rockwell hardness test is one of the most common indentation hardness tests, that has been developed for hardness testing. The result is a dimensionless number noted as HRA, HRB, HRC, etc., where the last letter is the respective Rockwell scale. Ashby, Michael; Hugh Shercliff; David Cebon (2007). In general, aluminium alloys are characterized by a relatively low density (2.7 g/cm3 as compared to 7.9 g/cm3 for steel), high electrical and thermal conductivities, and a resistance to corrosion in some common environments, including the ambient atmosphere. It is the prime material of construction for the aircraft industry throughout most of its history. Aluminium and its alloys are used widely in aerospace, automotive, architectural, lithographic, packaging, electrical and electronic applications. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. For general production the 5000 and 6000 series alloys provide adequate strength combined with good corrosion resistance, high toughness and ease of welding. To corrupt a colloquialism; pound for pound they weigh the same. DOE Fundamentals Handbook, Volume 1 and 2. For structural applications, material properties are crucial and engineers must take them into account. Once ignited, such fires are difficult to extinguish, because combustion continues in nitrogen (forming magnesium nitride), carbon dioxide (forming magnesium oxide and carbon), and water. We want to see our customers succeed with custom fabricated parts. Magnesium has the lowest melting point (923 K (1,202 °F)) of all the alkaline earth metals. The yield point is the point on a stress-strain curve that indicates the limit of elastic behavior and the beginning plastic behavior. Material properties are intensive properties, that means they are independent of the amount of mass and may vary from place to place within the system at any moment. Contact us today to learn more about what we can offer you. The aluminium alloys are divided into 9 families (Al1xxx to Al9xxx). Eberhart, Mark (2003). Moreover, there are three valence electrons of aluminum. In general, melting is a phase change of a substance from the solid to the liquid phase. And they are often used in combination with each other or other metals. Taylor and Francis Publishing. The Young’s modulus of elasticity is the elastic modulus for tensile and compressive stress in the linear elasticity regime of a uniaxial deformation and is usually assessed by tensile tests. Its flammability is greatly reduced by a small amount of calcium in the alloy. Harmony. Aluminium alloy compositions are registered with The Aluminum Association. Magnesium alloys have also a hexagonal lattice structure, which affects the fundamental properties of these alloys. Yield strengths vary from 35 MPa for a low-strength aluminum to greater than 1400 MPa for very high-strength steels. At room temperature, magnesium and its alloys are difficult to perform cold working due to the fact plastic deformation of the hexagonal lattice is more complicated than in cubic latticed metals like aluminium, copper and steel. Does your project call for stronger parts that won’t corrode over time? Despite its advantages, magnesium is still not as stable as aluminum. The Cookies Statement is part of our Privacy Policy. It also has a high melting point which makes it stronger at higher temperatures than other metals, like zinc. Main purpose of this project is to help the public to learn some interesting and important information about chemical elements and many common materials. This gives your casted parts better longevity. One crucial part of creating a custom casting system is deciding on the best metal. to learn more about what we can offer you. Since the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance, it is obvious, the density of a substance strongly depends on its atomic mass and also on the atomic number density (N; atoms/cm3). The heat transfer characteristics of a solid material are measured by a property called the thermal conductivity, k (or λ), measured in W/m.K. It is an intensive property, which is mathematically defined as mass divided by volume: In words, the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. Pure magnesium has an HCP crystal structure, is relatively soft, and has a low elastic modulus: 45 GPa. Both metals create alloys that are useful for their respective applications. Strength of a material is its ability to withstand this applied load without failure or plastic deformation. The stress-strain curve contains no higher stress than the ultimate strength. Heat capacity, thermal expansion, and thermal conductivity are properties that are often critical in the practical use of solids. Density is defined as the mass per unit volume. January 1993. Introduction to the Thermodynamics of Materials (4th ed.). Once the yield point is passed, some fraction of the deformation will be permanent and non-reversible. In general: Most materials are very nearly homogeneous, therefore we can usually write k = k (T). Feel free to ask a question, leave feedback or take a look at one of our articles. However, it is dependent on other factors, such as the preparation of the specimen, the presence or otherwise of surface defects, and the temperature of the test environment and material. The thermal conductivity of most liquids and solids varies with temperature. When a metal mixes with another metal or element. Magnesium also takes less time to solidify after mold injection and is often considered to have better castability than aluminum. Materials: engineering, science, processing and design (1st ed.). We realize that the basics in the materials science can help people to understand many common problems. It produces intense, bright, white light when it burns. Then aluminum might be the best option. Yield strength of 6061 aluminium alloy depends greatly on the temper of the material, but for T6 temper it is about 240 MPa. Aluminium is the most common alloying element. The strength of heat treated commercial Al alloys exceeds 550 MPa. The thermal conductivity of Elektron 21 – UNS M12310 is 116 W/(m.K). Despite the reactive nature of the pure magnesium powder, magnesium metal and its alloys have good resistance to corrosion.

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