Journal
SCRIPTA MATERIALIA
Volume 89, Issue -, Pages 1-4Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2014.07.002
Keywords
Toughness; Solidification microstructure; NiAl-Cr(Mo)-(Hf,Dy)-4Fe eutectic alloy; Directional solidification; Isothermal heat treatment
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Funding
- National Natural Science Foundation of China
- Natural Science Foundation of Shannxi Province [51074128, 2010JM6002]
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The microstructure evolution and room temperature fracture toughness of NiAl-Cr(Mo)-(Hf,Dy)-4Fe alloy during heat treatment have been investigated. After heat treatment (1250 degrees C), the NiAl and Cr(Mo) phases become coarse, and a local dissolution occurs in Cr(Mo) lamellae. Simultaneously, fine Hf solid solution appears at the NiAl/Cr(Mo) phase interface. Moreover, the addition of Fe can improve the fracture toughness of NiAl-Cr(Mo)-(Hf,Dy) alloy, and heat treatment can enhance fracture toughness further. The relevant toughness mechanism is also discussed. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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