期刊
ACTA MATERIALIA
卷 151, 期 -, 页码 377-394出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.03.059
关键词
Superalloys; Grain boundaries; Damage modelling; Crystal plasticity; Scanning electron microscopy
资金
- EPSRC [EP/J013501/1]
- EPSRC [EP/N010868/1, EP/H001379/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H001379/1, EP/N010868/1] Funding Source: researchfish
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 <001>, <011>, and <111> 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.
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