Chromium (Cr) – Chromium is added to aluminum to control grain structure, to prevent grain growth in aluminum-magnesium alloys, and to prevent recrystallization in aluminum-magnesium-silicon or aluminum-magnesium-zinc alloys during heat treatment. These alloys form an important complementary system with the 5xxx series alloy. When adding metal elements such as magnesium to other alloys, it becomes a priority to understand the application and how the metal with be worked, cast or welded. Magnesium and aluminum can also experience an increase of weldability as well as corrosion resistance. Some of the common applications of the 7xxx series alloys are aerospace, armored vehicles, baseball bats and bicycle frames. The most common applications for the 4xxx series alloys are filler wires for fusion welding and brazing of aluminum. Titanium is a common addition to aluminum weld filler wire as it refines the weld structure and helps to prevent weld cracking. As the amount of magnesium increases in the alloy, the average values of the dendrite arm spacing and grain size decreased, results in a fine and uniform grain structure as shown in micrographs. Other alloys within this series are often fusion welded with excellent results. The introduction of copper to aluminum can also reduce ductility and corrosion resistance. When the amount of aluminum alloy is increased when magnesium is added, the aluminum can loss ductility. Yet your application may require the alloy to have increased strength, workability, or ductility for the particular application. Magnesium alloys are materials of interest mostly due to their high strength-to-weight ratios, exceptional machinability and low cost. These alloys are the highest strength nonheat-treatable aluminum alloys and are, therefore, used extensively for structural applications. The room temperature strength and heat temperature strength of copper is improved significantly. While there have been experiments conducted to substitute magnesium for aluminum, it is still softer, less stable, more expensive and tends to bend easier when under stress. The principal effects of alloying elements in aluminum are as follows: Copper (Cu) 2xxx – The aluminum-copper alloys typically contain between 2 to 10% copper, with smaller additions of other elements. Manganese (Mn) 3xxx  – The addition of manganese to aluminum increases strength somewhat through solution strengthening and improves strain hardening while not appreciably reducing ductility or corrosion resistance. Silicon alone in aluminum produces a nonheat-treatable alloy; however, in combination with magnesium it produces a precipitation hardening heat-treatable alloy. The grain refining effect of titanium is enhanced if boron is present in the melt or if it is added as a master alloy containing boron largely combined as TiB2. This situation can impact marine industries that are using copper products in boat building, ship building and other applications that will experience the corrosive capabilities of salt water. Grain refinement of Al and its alloys has been an important process in commercial production Another important aspect of magnesium when added to nickel alloys that contain copper, such as cupronickel, is that the element becomes a strong deoxidizer. Here at Belmont Metals, we offer 50/50 magnesium aluminum in lumps and 20% magnesium copper in broken slabs. This element can increase the strength and hardness of aluminum while also increasing castability. Magnesium and aluminum can also experience an increase of weldability as well as corrosion resistance. When the amount of aluminum alloy is increased when magnesium is added, the aluminum can loss ductility. These alloys include some of the highest strength heat treatable aluminum alloys. Aluminum with magnesium added is commonly used in the construction industry and building materials, marine applications, ship building, chemical tankers, vehicle bodies, and other applications. . Some of these alloys can be susceptible to stress corrosion cracking and for this reason are not usually fusion welded. They have a low specific gravity of 1.74 g/cm 3 and a relatively low Young’s modulus (42 GPa) compared to other common alloys such as aluminium or steel alloys [4]. The modulus of elasticity is lowered by magnesium and raised by most other additions. They suffer, however, from brittleness and poor formability at room temperature [4]. The other alloying elements such as copper and magnesium are specified. The zinc substantially increases strength and permits precipitation hardening. The reason for this is that these alloys strain harden quickly and, are, therefore difficult and expensive to extrude. Introduction . Lead  (Pb) and Bismuth (Bi) – Lead and bismuth are added to aluminum to assist in chip formation and improve machinability. Among all Mg alloys, AZ (aluminum and zinc) series is the most widely used alloy system for various structural applications. Although the 1xxx series are almost pure aluminum, they will respond to strain hardening and especially so if they contain appreciable amounts of impurities such as iron and silicon. †3xx.x: Alloys in which silicon is the principal alloying element. Alloys on their own can offer a range of mechanical and structural benefits for manufacturers and other industries. By removing the oxygen, the copper alloy can become more fluid and will have less porosity. Copper also retains its good electrical conductivity. Titanium (Ti) – Titanium is added to aluminum primarily as a grain refiner. solute content on the microstructure of aluminum alloy under ultrasonic vibration is studThe ied. The 6xxx series alloys are easily and economically extruded and for this reason are most often found in an extensive selection of extruded shapes. Lithium (Li) - The addition of lithium to aluminum can substantially increase strength and, Young’s modulus, provide precipitation hardening and decreases density. †1xx.x: Controlled unalloyed (pure) compositions, especially for rotor manufacture †2xx.x: Alloys in which copper is the principal alloying element.

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