Alloys with aluminum

Sodium does not form alloys with aluminum but is used to modify the grain stmcture of aluminum—silicon alloys and aluminum—copper alloys for improved machinabiUty. Sodium—gold alloy is photoelectricaHy sensitive and may be used ia photoelectric cells. A sodium—2iac alloy, containing 2 wt % sodium and 98 wt % 2iac, is used to deoxidi2e other metals. 

Magnesium Extruded magnesium tubing is available per ASTM B217-58 alloyed with aluminum, manganese, or zinc. Ultimate and... 

This element does not appear in the headlines very often but it is of practical importance. Probably its greatest single use is in alloys, including stainless steels. Pure cobalt is almost as magnetic as iron and, when alloyed with aluminum, nickel, copper, and iron, the resulting Alnico alloy has a permanent magnetization far exceeding that of iron. 

The most important use of barium is as a scavenger in electronic tubes. The metal, often in powder form or as an alloy with aluminum, is employed to remove the last traces of gases from vacuum and television picture tubes. Alloys of barium have numerous applications. It is incorporated to lead alloy grids of acid batteries for better performance and added to molten steel and metals in deoxidizing alloys to lower the oxygen content. Thin films of barium are used as lubricant suitable at high temperatures on the rotors of anodes in vacuum X-ray tubes and on alloys used for spark plugs. A few radioactive isotopes of this element find applications in nuclear reactions and spectrometry. 

These alloys are available as wrought or cast alloys. The principal metals alloyed with aluminum include copper, manganese, silicon, magnesium, and zinc. These alloys are discussed in considerable detail under Aluminum Alloys. 

Keywords Titanium alloy with aluminum and tin Spherical particles Thermal stability Absorbed capacity on hydrogen... 

The alkaline earth metals have great practical importance. Calcium and magnesium ions are essential for human life. Calcium is found primarily in the structural minerals composing bones and teeth. Magnesium (as the Mg2+ ion) plays a vital role in metabolism and in muscle functions. Because magnesium metal has a relatively low density and displays moderate strength, it is a useful structural material, especially if alloyed with aluminum. 

It was noted above, that the as-cast eutectic alloys of binary Ti-Si system have no appreciable plasticity at room temperature. Alloying with aluminum, zirconium and use of various modifiers has also not allowed appreciable RT plasticity to be obtained. Data on temperature dependence of mechanical properties of deformed alloys of system Ti-3A1 6Zr-(2-6) Si show that, in contrast to as-cast alloys, deformed state with about 2 % Si demonstrate high plasticity ( 4%) reducing to 1.8 % in alloy with 6-wt.% Si. At the same time high-temperature strength of these alloys are practically the same, at 540-560 MPa level (600 °C). In such a way there is no reason to increase silicon content higher 2-wt.% in deformed state. 

System Ti-B-X represents a basis for development of alloys with a high stiffness, especially at additional alloying with aluminum [24], Titanium boride has high Young modulus and simultaneously it is practically insoluble in titanium matrix. Aluminum is one of few elements, which being dissolved in titanium increases Young modulus of matrix. 

Combines with oxygen at a red heat. Can burn in an atm of oxygen under certain conditions Chem. Eng. News 36, 36 (Aug. 4, 1958). Attacked by acids only on heating oxidized by nitric acid to the dioxide. Reacts with fluorine at 150 , with chlorine at 300°, with bromine at 360 , with iodine above 360. Combines with nitrogen at 800. Forms alloys with aluminum, chromium, cobalt, copper, iron, lead, nickel, tin. 

At the same time, at the additional alloying with aluminum the influence of aluminium at different content of silicon and at different temperatures is ambiguous. So, addition of aluminium in the alloy with 4 wt. % Si causes some worsening heat-resistance at the temperature of 900 °C, an additional alloying with zirconium making it worse yet (Fig. 1). 

Magnesium metal is industrially important as a major component in lightweight alloys (with aluminum and zinc). The metal surfaces develop an impervious oxide film which protects them from progressive deterioration. 

Aluminum and chromium are both passive metals in the true sense. Zinc exhibits good corrosion resistance, which is attributed to the formation of an adherent protective layer of corrosion products (this may also be considered as a form of passivity). Chromium, at concentrations >12%, confers passivity to its alloys with iron, and these alloys are cathodic to steel. Under most conditions, both aluminum and zinc are anodic to steel, as are iron-zinc alloys. Iron-aluminum alloys, however, are cathodic and in this respect are similar to iron-chromium alloys. The corrosion resistance of steel is increased by alloying with aluminum or chromium, such increase being marked with the latter. The addition of zinc decreases the corrosion resistance of steel, although, in many cases, a protective layer of corrosion products leads to an apparent decrease in the corrosion rate. 

The fuel for the reactor will be enriched, uranium alloyed with aluminum and made up Into aluminum-clad plates 0.060 in. thick. Because of the picture-frame type of construction used, no uranium is exposed to... 

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