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@article{32782, author = {Symonova, Anastasiya and Ducobu, Francois and Weiss, Viktorie}, article_location = {Ústí nad Labem}, article_number = {No. 3}, keywords = {crystal segregation; colour metallography; intermetallic phase; eutectic; colour etching; AlCu4MgMn; AlZn5.5MgCu; EDS}, language = {eng}, issn = {1213-2489}, journal = {Manufacturing Technology}, title = {The Mechanics of Machining Ultrafine-Grained Grade 2 Ti Processed Severe Plastic Deformation}, volume = {Vol. 16}, year = {2016} }
TY - JOUR ID - 32782 AU - Symonova, Anastasiya - Ducobu, Francois - Weiss, Viktorie PY - 2016 TI - The Mechanics of Machining Ultrafine-Grained Grade 2 Ti Processed Severe Plastic Deformation JF - Manufacturing Technology VL - Vol. 16 IS - No. 3 SP - 627-633 EP - 627-633 PB - J. E. Purkyne University SN - 12132489 KW - crystal segregation KW - colour metallography KW - intermetallic phase KW - eutectic KW - colour etching KW - AlCu4MgMn KW - AlZn5.5MgCu KW - EDS N2 - Aluminium alloys with higher content of alloying elements are very susceptible to the emergence of crystal segregation that significantly affects the mechanical, physical and chemical properties of these alloys. Crystal segregation is called chemical heterogeneity in microscale and is formed during crystallization. Crystallization of alloys does not occur at a particular temperature, as is the case of pure metals, but in a certain temperature interval. During cooling of the melt occurs to formation of different regions within the dendritic cell that differs in chemical composition. Generally is crystal segregation defined as chemical heterogeneity formed during alloy crystallization that is enriched or deprived of alloying elements and impurities that segregate unevenly across the surface of the dendrites. In the central area of the dendritic cells is alloy deprived of alloying elements, while the outer parts of dendritic cells and in space between dendrites is the concentration of alloying elements richer. This concentration has a hyperbolic course, when the central region of dendritic cells has the lowest concentration of the alloying elements and the outer part of dendrite boughs and interdendritic space have the maximum. Distribution of individual elements has a recurring character and can be described by sine function. The distance between two main axes of dendritic cells is affected by the temperature interval between the liquidus and solidus for the given alloy, the cooling rate of the melt and temperature gradient during solidification. Formation of the crystal segregation in aluminium alloys rich in alloying element and additives cannot be prevented, it is possible only influence its scope and with the right choice of heat treatment parameters can be suppressed. To suppress the crystal segregation the castings are subjected to heat treatment which is called homogenization annealing. It is the diffusion process in which there occurs to a balancing of chemical composition of alloy and the uniformity of its structure. ER -
SYMONOVA, Anastasiya, Francois DUCOBU and Viktorie WEISS. The Mechanics of Machining Ultrafine-Grained Grade 2 Ti Processed Severe Plastic Deformation. \textit{Manufacturing Technology}. Ústí nad Labem: J. E. Purkyne University, 2016, Vol. 16, No. 3, p.~627-633. ISSN~1213-2489.
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