An alloy is a mixture of chemical elements of which at least one is a metal. Unlike chemical compounds with metallic bases, an alloy will retain all the properties of a metal in the resulting material, such as electrical conductivity, ductility, opacity, and luster, but may have properties that differ from those of the pure metals, such as increased strength or hardness. In some cases, an alloy may reduce the overall cost of the material while preserving important properties. In other cases, the mixture imparts synergistic properties to the constituent metal elements such as corrosion resistance or mechanical strength.
Brass is an alloy of copper (Cu) and zinc (Zn), in proportions which can be varied to achieve varying mechanical, electrical, and chemical properties. It is a substitutional alloy: atoms of the two constituents may replace each other within the same crystal structure.
A metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically ductile and malleable. These properties are the result of the metallic bond between the atoms or molecules of the metal.
A slingshot is a small hand-powered projectile weapon. The classic form consists of a Y-shaped frame, with two natural-rubber strips or tubes attached to the upper two ends. The other ends of the strips lead back to a pocket that holds the projectile. One hand holds the frame, while the other hand grasps the pocket and draws it back to the desired extent to provide power for the projectile—up to a full span of the arm with sufficiently long bands.
Solder is a fusible metal alloy used to create a permanent bond between metal workpieces. Solder is melted in order to wet the parts of the joint, where it adheres to and connects the pieces after cooling. Metals or alloys suitable for use as solder should have a lower melting point than the pieces to be joined. The solder should also be resistant to oxidative and corrosive effects that would degrade the joint over time. Solder used in making electrical connections also needs to have favorable electrical characteristics.
Lauritz Melchior was a Danish-American opera singer. He was the preeminent Wagnerian tenor of the 1920s, 1930s, and 1940s and has come to be considered the quintessence of his voice type. Late in his career, Melchior appeared in movie musicals and on radio and television. He also made numerous recordings.
Brazing is a metal-joining process in which two or more metal items are joined together by melting and flowing a filler metal into the joint, with the filler metal having a lower melting point than the adjoining metal.
Melchior is the name traditionally given to one of the biblical Magi appearing in the Gospel of Matthew. There are many notable people with this name, or close variations.
Silumin is a general name for a group of lightweight, high-strength aluminium alloys based on an aluminum–silicon system. Aluminium-silicon alloys typically contain 3 to 25% silicon content. Casting is the primary use of aluminum-silicon alloys, but they can also be utilized in rapid solidification processes and powder metallurgy. Alloys used by powder metallurgy, rather than casting, may contain even more silicon, up to 50%. Silumin has a high resistance to corrosion, making it useful in humid environments.
Ib Jørgen Melchior was a Danish-American novelist, short-story writer, film producer, film director, and screenwriter of low-budget American science fiction movies, most of them released by American International Pictures.
An aluminium alloy is an alloy in which aluminium (Al) is the predominant metal. The typical alloying elements are copper, magnesium, manganese, silicon, tin, nickel and zinc. There are two principal classifications, namely casting alloys and wrought alloys, both of which are further subdivided into the categories heat-treatable and non-heat-treatable. About 85% of aluminium is used for wrought products, for example rolled plate, foils and extrusions. Cast aluminium alloys yield cost-effective products due to the low melting point, although they generally have lower tensile strengths than wrought alloys. The most important cast aluminium alloy system is Al–Si, where the high levels of silicon (4.0–13%) contribute to give good casting characteristics. Aluminium alloys are widely used in engineering structures and components where light weight or corrosion resistance is required.
Spring Awakening is a coming-of-age rock musical with music by Duncan Sheik and a book and lyrics by Steven Sater. It is based on the 1891 German play Spring Awakening by Frank Wedekind. Set in late 19th-century Germany, the musical tells the story of teenagers discovering the inner and outer tumult of adolescent sexuality. In the musical, alternative rock is employed as part of the folk-infused rock score.
The podstakannik, or tea glass holder, is a holder with a handle, most commonly made of metal that holds a drinking glass (stakan). Their primary purpose is to be able to hold a very hot glass of tea, which is usually consumed right after it is brewed. The stability of the glass on the table is also significantly improved. It is a traditional way of serving and drinking tea in Russia, Ukraine, Belarus, and other Slavic states.
In metallurgy, melchior is an alloy of copper, mainly with nickel (5–30%). Its name originates from Italian: melchior, which in turn is distorted French: maillechort, honoring the French inventors of the alloy, Maillot and Chorier. The term melchior sometimes refers not only to the copper-nickel alloys, but also ternary alloys of copper with nickel and zinc and even a silvered brass. Melchior is easily deformable by application of pressure, both in the hot and cold state. After annealing, it has a tensile strength of about 40 kg/mm2. The most valuable property of melchior is its high resistance to corrosion in air, freshwater and seawater. Increasing content of nickel, iron or manganese improves corrosion and cavitation resistance, especially in sea water and atmospheric water vapor. The alloy of 30% Ni, 0.8% Fe, 1% Mn and 68.2% Cu is used in maritime shipping, in particular for the manufacture of condenser tubes. Nickel gives melchior, unlike brass and bronze, a silver color, and that property, combined with its high corrosion resistance, made it popular for the manufacture of household utensils in the Soviet Union, though more recent research has concluded that nickel is mildly carcinogenic when used in food preparation and consumption.
Melchior Base is an Argentine Antarctic base and scientific research station. It is located on Gamma Island, Melchior Islands, Dallmann Bay, in Palmer Archipelago on Bellingshausen Sea, Antarctic Peninsula.
