![]() Titanium alloys are metals that contain a mixture of titanium and other chemical elements. Flame temperatures of magnesium and some magnesium alloys can reach 3,100☌. It produces intense, bright, white light when it burns. ![]() We must add, pure magnesium is highly flammable, especially when powdered or shaved into thin strips, though it is difficult to ignite in mass or bulk. Despite the reactive nature of the pure magnesium powder, magnesium metal and its alloys have good resistance to corrosion. ![]() Magnesium alloys are typically used as cast alloys. Magnesium has the lowest melting (923 K (1,202 ☏)) of all the alkaline earth metals. Since the most outstanding characteristic of magnesium is its density, 1.7 g/cm 3, its alloys are used where light weight is an important consideration (e.g., in aircraft components). Magnesium alloys are mixtures of magnesium and other alloying metal, usually aluminium, zinc, silicon, manganese, copper and zirconium. Aluminium and its alloys are used widely in aerospace, automotive, architectural, lithographic, packaging, electrical and electronic applications. For general production the 50 series alloys provide adequate strength combined with good corrosion resistance, high toughness and ease of welding. The chief limitation of aluminum is its low melting temperature (660☌), which restricts the maximum temperature at which it can be used. In general, aluminium alloys are characterized by a relatively low density (2.7 g/cm 3 as compared to 7.9 g/cm 3 for steel), high electrical and thermal conductivities, and a resistance to corrosion in some common environments, including the ambient atmosphere. High strength can be achieved among others by introduction of a high volume fraction of fine, homogeneously distributed second phase particles and by a refinement of the grain size. Mechanical properties of aluminium alloys highly depend on their phase composition and microstructure. The elastic modulus of beryllium is nearly three times that of titanium. In addition to these metals, beryllium is also a high-strength, lightweight metal with very high elastic modulus (303 GPa) that is finding increasing use as a structural material in aerospace vehicles. Aluminium is the most versatile of these materials and titanium is the most corrosion resistant with very high strength, while magnesium has the lowest density. These three metals and their alloys comprise the bulk of the high strength-to-weight ratio metallic materials used in industrial systems. Types of Light AlloysĪs was written, magnesium, aluminium and titanium are light metals of significant commercial importance. Therefore, we are discussing primarily the alloys instead of pure metals. On the other hand, tensile strength of 6061 aluminium alloy may reach more than 290 MPa depending on the temper of the material. For example, high purity aluminium is a soft material with the ultimate strength of approximately 10 MPa, which limits its usability in industrial applications. Since these pure metals are usually softer materials with insufficient strength, they must be alloyed to reach target mechanical properties. The metals commonly classed as light metals are those whose density is less than the density of steel (7.8 g/cm 3, or 0.28 lb/in. ![]() Their densities of 1.7 (magnesium), 2.7 (aluminium) and 4.5 g/cm 3 (titanium) range from 19 to 56% of the densities of the older structural metals, iron (7.9g/cm 3) and copper (8.9 g/cm 3). Magnesium, aluminium and titanium are light metals of significant commercial importance. These metals and alloys are of great importance in engineering applications for use in land, sea, air, and space transportation. Light metals and its alloys are materials of relatively low density and high strength-to-weight ratios.
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