期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 462, 期 1-2, 页码 197-201出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.03.155
关键词
magnesium alloys; hot deformation; microstructure; recrystallization
High-temperature plastic deformation and dynamic recrystallization of AZ31 extruded (EX) and heat treated (FA) alloy was investigated in the temperature range between 200 and 400 degrees C. High-temperature straining resulted in partial dynamic recrystallization above 250 degrees C; in the EX alloy recrystallization was complete at 300 degrees C, while a moderate grain growth was observed at 400 degrees C. The peak flow stress dependence on temperature and strain rate are described by means of the conventional sinh equation; the calculation of the activation energy for high temperature in the whole range of temperature deformation gives Q= 155 kJ/mol, i.e. a value that was reasonably close but higher than the activation energy for self diffusion in Mg. The microstructure resulting from high-temperature straining was found to be substantially different in EX and FA alloys; in particular, the EX alloy was characterized by a lower flow stress, a higher ductility and by a finer size of the dynamically recrystallized grains. These results are then discussed on the basis of the necklace mechanism of dynamic recrystallization. (C) 2006 Elsevier B.V. All rights reserved.
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