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Metallurgical and Materials Transactions A

, Volume 46, Issue 2, pp 557–565 | Cite as

Mechanical Properties and Fracture Behavior of Directionally Solidified NiAl-V Eutectic Composites

  • Srdjan MilenkovicEmail author
  • Rubens Caram
Symposium: Materials for High-Temperature Applications: Next Generation Superalloys and Beyond

Abstract

Directional solidification of eutectic alloys has been recognized as promising technique for producing in situ composite materials exhibiting balance of properties. Therefore, an in situ NiAl-V eutectic composite has been successfully directionally solidified using Bridgman technique. The mechanical behavior of the composite including fracture resistance, microhardness, and compressive properties at room and elevated temperatures was investigated. Damage evolution and fracture characteristics were also discussed. The obtained results indicate that the NiAl-V eutectic retains high yield strength up to 1073 K (800 °C), above which there is a rapid decrease in strength. Its yield strength is higher than that of binary NiAl and most of the NiAl-based eutectics. The exhibited fracture toughness of 28.5 MPa√m is the highest of all other NiAl-based systems investigated so far. The material exhibited brittle fracture behavior of transgranular type and all observations pointed out that the main fracture micromechanism was cleavage.

Keywords

Fracture Toughness NiAl Molybdenum Disulfide Eutectic Alloy Creep Strength 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

Funding of the Project NECTAR (PCIG10-GA-2011-303409) by the Marie Curie Actions Grant FP7-PEOPLE-2011-CIG program is gratefully acknowledged. SM acknowledges the Ramon y Cajal fellowships from the Spanish Ministry of Economy and Competitiveness. The financial support from the São Paulo State Research Foundation (FAPESP, Brazil) is acknowledged.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2014

Authors and Affiliations

  1. 1.Solidification Processing and Engineering GroupIMDEA Materials InstituteGetafeSpain
  2. 2.Department of Materials EngineeringState University of CampinasCampinasBrazil
  3. 3.FEM/UNICAMPCampinasBrazil

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