Abstract
By using differential scanning calorimetry (DSC), energetic measurements associated with the different peaks displayed during linear heating of Cu-20 % at. Mn were made, employing quenched and cold-worked materials. Unlike to the situation observed in the quenched alloy in which disperse order is developed, in the deformed alloy such process is inhibited by the segregation of solute atoms to partial dislocations. An appropriate model for calculating the energy evolved during the pinning process was applied in order to determine the dislocation density from the exothermic peak designated as stage 4. The computed value, which is in excellent agreement with the one obtained from expressions governing the energy release accompanying recrystallization, allows to verify together with microhardness measurements and kinetic analysis that the first observed thermal effect in the deformed material effectively corresponds to a solute segregation process.
Highlights
By using differential scanning calorimetry (DSC), energetic measurements associated with the different peaks displayed during linear heating of Cu-20 % at
Se ha observado que en aleaciones aCu-Al deformadas en frío (15 y 16), la segregación de átomos de soluto hacia las dislocaciones parciales ocurre simultáneamente con el desarrollo de orden disperso
FIG. 3.— a) DSC traces for the quenched and b)for the 50 % cold-rolled alloys (b), showing room temperature microhardness valúes after samples had been heated to the temperatures indicated
Summary
El fenómeno de orden disperso (DO) es un buen ejemplo de un proceso que conduce a una microestructura estable y heterogénea [1,2,3], caracterizado por la presencia de partículas altamente ordenadas. (c) Consejo Superior de Investigaciones Científicas Licencia Creative Commons 3.0 España (by-nc) dentro de una matriz. Se ha observado que en aleaciones aCu-Al deformadas en frío (15 y 16), la segregación de átomos de soluto hacia las dislocaciones parciales ocurre simultáneamente con el desarrollo de orden disperso. Estos resultados son la razón por la cual se desea realizar este estudio en aleaciones aCu-Mn, en donde la energía de enlace entre un átomo de manganeso y una dislocación. Parcial resulta ser 3,5 veces mayor que para un átomo de aluminio, como se calcula posteriormente.
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