WitrynaThe segregation of residual impurities to grain boundaries in steel can occur over a wide range of temperatures, although it is usually accentuated in the range of 400–600 °C. In service this segregation can occur in the following ways: if the material is used in this temperature range for prolonged periods of time, if it undergoes a slow ... Witryna20 sty 2024 · The segregation thermodynamics of the Fe impurity showed that the introduction of Ti enhanced the Fe impurity removal from Si, and the equilibrium segregation coefficient of Fe impurity decreased to 7.56 × 10 −7. The results of this study are highly significant for the purification of silicon using the hypereutectic Si–Ti …
Effect of Solid–Liquid Interface Morphology on Grain Boundary ...
Witryna5 sty 2024 · These defects represent locations with reduced cohesion that can, due to an excess volume, attract impurities. Segregated impurities then can further reduce the … Witryna8 mar 2024 · It is theoretically expected that neutral carbon impurities exhibit similar GB segregation via elastic interactions in which the local atomic stresses are reduced via … convenience sampling through social media
A general approach for calculating melt–solid impurity segregation ...
Witryna6 kwi 2016 · impurities segregate more at GBs than within grains during solidi fi cation of mc-Si, which is possibly explained as due to the peculiar geometry of the solid − liquid interface at the GB. Witryna11 kwi 2024 · Details about the segregation have been listed in Table II. (e)–(g) are the magnified views of the regions marked by the black dashed square in (a)–(c), respectively. In the figures, blue, dark blue, and rose represent FCC, defect atom, and Cr, respectively. The segregation of Cr atoms at TB could be clearly seen from the figures. Witrynaimplantation or annealing), the impurities tend to aggregate and segregate. This segregation may be only chemical (region (2)), i.e. the crystal structure is maintained and only the local impurity concentration varies across the material, alternating between impurity-rich and impurity-poor regions (e.g. in Co-doped ZnO [7] and Mn-doped … fallout 4 dr. chambers laboratory