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A eutectic or eutectic mixture is a mixture of two or more elements which has a lower melting point than any of its constituents. The proper ratios of components to obtain a eutectic alloy is identified by the eutectic point on a phase diagram. The term comes from the Greek 'eutektos', meaning 'easily melted.' Jump to: navigation, search A chemical element, often called simply element, is the class of atoms which contain the same number of protons. ... Jump to: navigation, search The melting point of a solid is the temperature at which it changes state from solid to liquid. ... This page is a candidate for speedy deletion. ... In physical chemistry and materials science, a phase diagram is a type of graph used to show the equilibrium conditions between the thermodynamically-distinct phases. ...

The phase diagram at right displays a simple binary system composed of two components, A and B, which has a eutectic point. The phase diagram plots relative concentrations of A and B along the X-axis, and temperature along the Y-axis. The eutectic point is the point at which the liquid phase borders directly on the solid α + β phases (the solid forms of pure A and B), representing the minimum melting temperature of any possible alloy of A and B. The temperature that corresponds to this point is known as the eutectic temperature. Not all binary system alloys have a eutectic point. Image File history File links Binary phase diagram of eutectic alloy This image created by me, Bryan Antman, on November 19, 2004. ... Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... A liquid will assume the shape of its container. ... ... In jewelry, a solid gold piece is the alternative to gold-filled or gold-plated jewelry. ...


Solid products of a eutectic transformation can often be identified by their lamellar structure, as opposed to the dendritic structures commonly seen in non-eutectic solidification. The same conditions that force the material to form lamellae can instead form an amorphous solid if pushed to an extreme. Lamellar structures or microstructures are composed of fine, alternating layers of different materials in the form of lamellae. ... A crystal dendrite is a crystal that develops with a typical multi-branching tree-like form. ... An amorphous solid is a solid in which there is no long-range order of the positions of the atoms. ...

Contents


Metallic eutectics

The term is often used in metallurgy to describe the alloy of two or more component materials having the relative concentrations specified at the eutectic point. When a non-eutectic alloy freezes, one component of the alloy crystallizes at one temperature and the other at a different temperature. With a eutectic alloy, the mixture freezes as one at a single temperature. A eutectic alloy therefore has a sharp melting point, and a non-eutectic alloy exhibits a plastic melting range. The phase transformations that occur while freezing a given alloy can be understood using the phase diagram by drawing a vertical line from the liquid phase to the solid phase on a phase diagram; each point along the line describes the composition at a given temperature. Jump to: navigation, search Metallurgy is a domain of materials science and of materials engineering that studies the physical and chemical behavior of metallic elements and their mixtures, which are called alloys. ... An alloy is a combination, either in solution or compound, of two or more elements, which has a combination of at least two metals, and where the resultant material has metallic properties. ... Crystal (disambiguation) Insulin crystals A crystal is a solid in which the constituent atoms, molecules, or ions are packed in a regularly ordered, repeating pattern extending in all three spatial dimensions. ...


Some uses include:

Jump to: navigation, search (De)soldering a contact from a wire. ... Jump to: navigation, search General Name, Symbol, Number tin, Sn, 50 Chemical series poor metals Group, Period, Block 14, 5, p Appearance silvery lustrous gray Atomic mass 118. ... Jump to: navigation, search General Name, Symbol, Number lead, Pb, 82 Chemical series poor metals Group, Period, Block 14, 6, p Appearance bluish white Atomic mass 207. ... Jump to: navigation, search General Name, Symbol, Number silver, Ag, 47 Chemical series transition metals Group, Period, Block 11, 5, d Appearance lustrous white metal Atomic mass 107. ... Jump to: navigation, search General Name, Symbol, Number gold, Au, 79 Chemical series transition metals Group, Period, Block 11, 6, d Appearance metallic yellow Atomic mass 196. ... Aluminum is a soft and lightweight metal with a dull silvery appearance, due to a thin layer of oxidation that forms quickly when it is exposed to air. ... Jump to: navigation, search General Name, Symbol, Number silicon, Si, 14 Chemical series metalloids Group, Period, Block 14, 3, p Appearance dark gray, bluish tinge Atomic mass 28. ... Cast iron usually refers to grey cast iron, but can mean any of a group of iron-based alloys containing more than 2% carbon (alloys with less carbon are carbon steel by definition). ... Jump to: navigation, search General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... Jump to: navigation, search General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... Brazing is a joining process whereby a non-ferrous filler metal and an alloy are heated to melting temperature (above 450°C / 800°F) and distributed between two or more close-fitting parts by capillary action. ... Woods metal is a fusible alloy that becomes liquid at approximately 70 °C. It is a eutectic alloy of bismuth, lead, tin, and cadmium with the following percentages by weight: 50 % Bi, 26. ... The term sprinkler system may also refer to a type of irrigation system. ... Jump to: navigation, search General Name, Symbol, Number mercury, Hg, 80 Chemical series transition metals Group, Period, Block 12, 6, d Appearance silvery white Atomic mass 200. ... Galinstan is an alloy of Gallium, Indium, and Tin which is liquid at room temperature, typically freezing at below 20 degrees Celsius. ... An amorphous metal is a metallic material (usually an alloy rather than a pure metal) with a disordered atomic-scale structure. ... Corrosion, atmospheric and biologic (Barnacles) Corrosion is deterioration of useful properties in a material due to reactions with its environment. ...

Other eutectic mixtures

Sodium chloride and water form a eutectic mixture. It has a eutectic point of -21.2 C[1] and 23.3%[2] salt by weight. The eutectic nature of salt and water is exploited when salt is spread on roads to aid snow removal, or mixed with ice to produce low temperatures (for example, in traditional ice cream making). Jump to: navigation, search Flash point  ? °C R/S statement R: ? S: ? RTECS number  ? Supplementary data page Structure and properties n, εr, etc. ... Jump to: navigation, search Water (from the Old English word wæter; c. ... A sidewalk clearing plow in Ottawa, Canada Snow removal is the job of removing snow after a snowfall to make travel easier and safer. ... Missing image Ice cream is often served on a stick Boxes of ice cream are often found in stores in a display freezer. ...


Minerals may form eutectic mixtures in igneous rocks[3]. Jump to: navigation, search This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ... Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ...


Some inks are eutectic mixtures, allowing inkjet printers to operate at lower temperatures[4]. Jump to: navigation, search Ink jet printers are the most common type of computer printer; and industry and commerce also use them extensively for special-purpose applications. ...


Other critical points: eutectoid and peritectic

When the solution above the transformation point is solid, rather than liquid, an analogous eutectoid transformation can occur. For instance, in the iron-carbon system, the austenite phase can undergo a eutectoid transformation to produce ferrite and cementite (iron carbide), often in lamellar structures such as pearlite and bainite. This eutectoid point is at about 0.6% carbon; alloys of nearly this composition are called high-carbon steel, while those which do not undergo eutectoid transformation are termed mild steel. The process analogous to glass formation in this system is the martensitic transformation. Eutectoid transformation occurs when a solid solution decomposes into a fixed two solid constituents at a fixed temperature. ... Jump to: navigation, search General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... Jump to: navigation, search General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... Iron-carbon phase diagram, showing the conditions under which austenite (γ) is stable in carbon steel. ... Ferrite may refer to: (1) ferromagnetic ceramic materials, used in magnetic applications; (2) iron or iron alloys with a body centred cubic crystal structure. ... Cementite or iron carbide is a chemical compound with the formula Fe3C, and an orthorhombic crystal structure. ... Cementite or iron carbide is a chemical compound with the formula Fe3C. It is a hard, brittle component of carbon steel, with orthorhombic crystals, and forms from austenite during cooling. ... Lamellar structures or microstructures are composed of fine, alternating layers of different materials in the form of lamellae. ... Pearlite is a two-phased, lamellar structure composed of alternating layers of ferrite (88 wt%) and cementite (12%) that occurs in steel. ... Jump to: navigation, search Iron-carbon phase diagram, showing the eutectoid temperature and composition, at which bainite can form. ... Martensite, named after the German metallurgist Adolf Martens, is a class of hard minerals occurring as lathe- or plate-shaped crystals. ...


Peritectic transformations are also similar to eutectic reactions. Here, a liquid and solid phase of fixed proportions react at a fixed temperature to yield a single solid phase. Since the solid product forms at the interface between the two reactants, it can form a diffusion barrier and generally causes such reactions to proceed much more slowly than eutectic or eutectoid transformations. Peritectic transformations occur when a liquid and solid phase of fixed proportions react at a fixed temperature to yield a single solid phase. ...


See also


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