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J Mater Sci Technol  2009, Vol. 25 Issue (03): 361-364    DOI:
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Formation of Re-containing Carbides in a Second Generation Directionally Solidi¯ed Ni Base Superalloy
T. Zhao1,2),  D. Wang2), J. Zhang2)†, G. Chen1) and L.H. Lou2)
1. Institute of Metal Research Chinese Academy of Sciences
2. Nanjing University of Science and Technology
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The precipitates at grain boundary in a directionally solidified Ni base superalloy after heat treatment, aging at 975°C, and creep rupture test have been characterized. Besides the primary MC carbides and fine particles of  μ phase, the Re-containing M23C6 was observed. The precipitation kinetics revealed that the formation of M23C6 was associated with the dissolution of μ phase and MC carbides. TEM image shows that the continuous precipitation of M23C6 particles effectively hinders the dislocation  movement and strengthens the grain boundaries. The high strength of the alloy suggests that M23C6 carbides are beneficial to the properties although Re as an important matrix strengthening element was consumed.

Key words:  Ni-base Superalloys      Directional solidification      Rhenium      Carbide     
Received:  27 August 2008     
Corresponding Authors:  Jian Zhang     E-mail:

Cite this article: 

Tan Zhao,Dong Wang,Jian Zhang,Guang Chen,Langhong Lou. Formation of Re-containing Carbides in a Second Generation Directionally Solidi¯ed Ni Base Superalloy. J Mater Sci Technol, 2009, 25(03): 361-364.

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