on the grain boundaries
101intercrystalline corrosion — chromium nickel austenitic stainless steels are prone to this form of corrosion when they are welded and subsequently in contact with certain types of corrosive media. When heated within a temperature range of 450 800 deg C precipitation of the… …
102leaded steel — when added to steel, lead does not go into solution but exists in a very finely divided state along the grain boundaries. It greatly assists machinability as it acts as a lubricant between the steel and the tool face. Lead is normally added in… …
103microchemistry — noun a) Chemical techniques for preparing, handling, and analyzing small quantities of chemical compounds, especially masses less than a milligram. b) Chemical processes that take place in very small regions, such as on the grain boundaries of a… …
104intercrystalline cracking — fracture of metal that follows along the grain boundaries and between crystals or grains …
105History of cartography — The Fra Mauro map, one of the greatest memorial of medieval cartography, was made around 1450 by the Venetian monk Fra Mauro. It is a circular world map drawn on parchment and set in a wooden frame, about two meters in diameter Cartography (from… …
106Underwater acoustics — The field of underwater acoustics is closely related to a number of other fields of acoustic study, including sonar, transduction, acoustic signal processing, acoustical oceanography, bioacoustics, and physical acoustics.HistoryUnderwater sound… …
107Byzantine Empire — the Eastern Roman Empire after the fall of the Western Empire in A.D. 476. Cap.: Constantinople. * * * Empire, southeastern and southern Europe and western Asia. It began as the city of Byzantium, which had grown from an ancient Greek colony… …
108materials science — the study of the characteristics and uses of various materials, as glass, plastics, and metals. [1960 65] * * * Study of the properties of solid materials and how those properties are determined by the material s composition and structure, both… …
109Ranchos of California — The Spanish, and later the Méxican government encouraged settlement of territory now known as California by the establishment of large land grants called ranchos, from which the English ranch is derived. Devoted to raising cattle and sheep, the… …
110History of Roraima — The history of the territory that is now Roraima, a state at the extreme north of present day Brazil is recent, but not thereby simple. Invaded numerous times by the various countries interested in the region, the seldom visited Roraima arose… …
