Polycrystal

Polycrystal
A photo of electrical steel (coating removed) showing polycrystalline structure

Polycrystalline materials are solids that are composed of many crystallites of varying size and orientation. The variation in direction can be random (called random texture) or directed, possibly due to growth and processing conditions. Fiber texture is an example of the latter.

Almost all common metals, and many ceramics are polycrystalline. Some elements such as Sulfur, while usually occurring in polycrystalline form, may also occur as single crystals.[1] The crystallites are often referred to as grains, however, powder grains are a different context. Powder grains can themselves be composed of smaller polycrystalline grains.[2]

Polycrystalline is the structure of a solid material that, when cooled, forms crystallite grains at different points within it. The areas where these crystallite grains meet are known as grain boundaries.

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References



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Look at other dictionaries:

  • polycrystal — ▪ crystallography       any solid object composed of randomly oriented crystalline regions, called crystallites (crystallite), especially as distinguished from a single crystal (q.v.). Polycrystalline materials result when a substance solidifies… …   Universalium

  • polycrystal — polikristalas statusas T sritis chemija apibrėžtis Kristalinis kūnas, susidedantis iš daugelio netvarkingai išsidėsčiusių kristalų. atitikmenys: angl. polycrystal rus. поликристалл …   Chemijos terminų aiškinamasis žodynas

  • polycrystal — polikristalas statusas T sritis fizika atitikmenys: angl. polycrystal vok. Polykristall, m rus. поликристалл, m pranc. polycristal, m …   Fizikos terminų žodynas

  • polycrystal silicon — polikristalinis silicis statusas T sritis radioelektronika atitikmenys: angl. polycrystal silicon; polysilicon vok. polykristallines Silizium, n; Polykristallsilizium, n; Polysilizium, n rus. поликремний, m; поликристаллический кремний, m pranc.… …   Radioelektronikos terminų žodynas

  • polycrystal isolation — izoliavimas polikristaliniu siliciu statusas T sritis radioelektronika atitikmenys: angl. polycrystal isolation vok. Polysilizium Isolation, f rus. изоляция поликристаллическим кремнием, f pranc. isolation par silicium polycri stallin, f …   Radioelektronikos terminų žodynas

  • polycrystal — noun see polycrystalline …   New Collegiate Dictionary

  • polycrystal — noun Any polycrystalline substance …   Wiktionary

  • polycrystal — Смотри Поликристалл …   Энциклопедический словарь по металлургии

  • polycrystal — poly·crystal …   English syllables

  • polycrystal — |pälē, lə̇+ noun Etymology: poly + crystal : a polycrystalline body or object …   Useful english dictionary

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