期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 649, 期 -, 页码 229-238出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.07.098
关键词
Ultra-fine grained material; Thermal stability study; Grain growth kinetics; Cryorolling; Severe plastic deformation; Aluminium 2014 alloy
In the present work influence of annealing on precipitation phenomena, thermal stability and grain growth kinetics of a bulk ultrafine grained (UFG) Al 2014 alloy has been studied. As-received solution treated Al 2014 alloy is subjected to cryorolling (CR) to develop ultrafine grained microstructure and subsequently, annealing treatment in the range of 323 K (50 degrees C) to 673 K (400 degrees C) for the duration of 30 min is done to study its thermal stability. The recrystallization process of the cryorolled Al 2014 alloy starts at 373 K (100 degrees C) and completes at 523 K (250 degrees C). The UFG microstructure is retained in the CR Al 2014 alloy up to 623 K (350 degrees C). The high thermal stability of the UFG grained Al 2014 alloy is due to pinning action of precipitate particles of Cu2Al and AlCuMgSi phases which are within the range of 100 nm and lying along the grain boundaries. The activation energy required for grain growth of the CR Al 2014 alloy is found to be exceptionally high as compared to other processing routes. (C) 2015 Elsevier B.V. All rights reserved.
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