Journal
MATERIALS LETTERS
Volume 152, Issue -, Pages 272-275Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2015.03.142
Keywords
Nickel based superalloy; Electron microscopy; Deformation mechanism; Microstructure; Precipitate size
Funding
- National Natural Science Foundation of China [51171188, 51390473, 51171179, 51271097, 11332010]
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A Co-rich nickel based superalloy with different size of gamma' precipitates is obtained through varied aging time. Microstructures after tensile deformation at intermediate temperature are investigated by transmission electron microscopy. With the increasing gamma' precipitate size, the deformation mode of the alloy changes from cutting the precipitates by 1/2 < 110 > dislocation pairs to cutting by 1/6 < 112 > partial dislocations. Microtwinning occurs with high density of stacking faults, attributing to the low stacking fault energy of the alloy. With further increase of the precipitate size, the alloy starts to be deformed by Orowan bypassing mechanism. (C) 2015 Elsevier B.V. All rights reserved.
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