Grain boundary properties of a nickel-based superalloy: Characterisation and modelling
Grain boundary properties of a nickel-based superalloy: Characterisation and modelling
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DOI：
10.1016/j.actamat.2018.03.059
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发表时间：
2018-06-01
期刊：
影响因子：
9.4
通讯作者：
Reed, R. C.
中科院分区：
文献类型：
--
作者：
Alabort, E.;Barba, D.;Reed, R. C.
Miniaturised tensile tests coupled with in-situ scanning electron microscopy are used to deduce the grain boundary properties of a nickel-based superalloy at 750 degrees C. This allows the damage initiation, evolution and failure processes to be observed directly. The significant variation in ductility - consistent with the limited number of grain boundaries being present - is rationalised using a crystal plasticity approach calibrated by experiments on single crystals loaded along the , , and directions. Quantitative strength and toughness values for the grain boundaries are estimated using a cohesive zone method. The modelling approach is used to determine an approximation of the size of the representative volume element (RVE) needed for volume-averaged behaviour. (C) 2018 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
