Macrostructure

macrostructure

[¦mak·rō′strək·chər] (metallurgy) Structure of an etched metal visible to the naked eye or at magnifications up to 10 diameters. (science and technology) The external forms of a structure that can be observed without magnification, for example, the cubic crystal form of sodium chloride.

Macrostructure

(of a metal), the structure of a metal that is visible visually or under a magnifying glass (that is, under magnification of up to 25 X). The macrostructure is studied in flat samples, called templates, cut from an item or blank, and also on the fracture surfaces of articles. To reveal the surface structure of a template, it is polished carefully and then etched with solutions of acids or alkalies.

The study of the macrostructure reveals discontinuities in the metal (cavities, porosity, gas bubbles, stratification, and fissures), distribution of impurities and nonmetallic inclusions, shape and distribution of crystallites (grains) in various parts of the item, and sometimes even the structural features of individual grains of the metal. Studies of the macrostructure lead to conclusions on the quality of initial materials and the correctness of the conduct of casting, pressure working, and welding processes. In some cases the quality of metals is characterized by the type of fracture, which makes possible determination of the path of the plane of fracture (through the body or along the grain boundaries) and of the causes of fracture.

V. IU. NOVIKOV

单词	macrostructure
释义	macrostructure macrostructure (ˈmækrəʊˌstrʌktʃə) nthe large-scale structure or extent of something, which comprises all smaller structures or everything within that thing mac•ro•struc•ture (ˈmæk roʊˌstrʌk tʃər) n. an overall structure or organizational scheme. [1915–20] Macrostructure macrostructure [¦mak·rō′strək·chər] (metallurgy) Structure of an etched metal visible to the naked eye or at magnifications up to 10 diameters. (science and technology) The external forms of a structure that can be observed without magnification, for example, the cubic crystal form of sodium chloride. Macrostructure (of a metal), the structure of a metal that is visible visually or under a magnifying glass (that is, under magnification of up to 25 X). The macrostructure is studied in flat samples, called templates, cut from an item or blank, and also on the fracture surfaces of articles. To reveal the surface structure of a template, it is polished carefully and then etched with solutions of acids or alkalies. The study of the macrostructure reveals discontinuities in the metal (cavities, porosity, gas bubbles, stratification, and fissures), distribution of impurities and nonmetallic inclusions, shape and distribution of crystallites (grains) in various parts of the item, and sometimes even the structural features of individual grains of the metal. Studies of the macrostructure lead to conclusions on the quality of initial materials and the correctness of the conduct of casting, pressure working, and welding processes. In some cases the quality of metals is characterized by the type of fracture, which makes possible determination of the path of the plane of fracture (through the body or along the grain boundaries) and of the causes of fracture. V. IU. NOVIKOV macrostructure macrostructure (măk′rō-strŭk″tūr) The overall or gross structure of an entity.
随便看	in your own interest in your own little world in your own name in your own right in your own sweet time in your own sweet way in your own time in your own way in your own world in your pelt in your place in your pocket in your pomp in your possession in your prayers in your presence in your prime in your primes in your reach in your right mind in your right minds in your road in your salad days in your second childhood in your shadow

macrostructure

macrostructure

mac•ro•struc•ture

Macrostructure

macrostructure

Macrostructure

macrostructure

macrostructure