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The precipitation of nano-scaled M(23)C(6) carbide at intragranular regions (especially in dendritic core regions) has been systematically investigated in a directionally solidified Ni-base superalloy. The crystallographic orientation relationship between the M(23)C(6) phase and the gamma matrix phase was found to be (100)(M23C6)//(100)(gamma), [100](M23C6)//[100](gamma). Additionally, M(23)C(6) carbide was very stable during creep and long-term thermal exposure, which makes the fine M(23)C(6) carbide an effective strengthening phase in gamma matrix. (C) 2009 Elsevier Inc. All rights reserved.