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Synthesis and characterization of NbCr2 Laves phase produced by spark plasma sintering

Published online by Cambridge University Press:  12 February 2016

K.W. Li ,
S.M. Li ,
K. Gao  and
D.Q. Gong
K.W. Li*
Affiliation:
College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China
S.M. Li
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
K. Gao
Affiliation:
School of Mechatronics Engineering, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou, Henan 450000, China
D.Q. Gong
Affiliation:
College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China
*
a)Address all correspondence to this author. e-mail: lkw917@126.com
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Abstract

The NbCr2 Laves phase was fabricated by spark plasma sintering (SPS) using spherical Nb and Cr powders. The experimental results revealed that increasing the sintering temperature to 1773 K can result in the formation of NbCr2 Laves phase as major phase, but it always appeared with trace amounts of Nb and Cr solid solutions. Based on the theoretical calculations, the residual of Nb and Cr solid solutions was attributed to the inhomogeneous distribution of temperature increase from the particle-contacting surface to the center of particle when pulsed current passed through. Moreover, the hardness and fracture toughness of the SPS-processed NbCr2 attained 14.05 ± 0.67 GPa and 8.9 MPa·m1/2, which were 1.6 and 7.4 times of the as-cast NbCr2 Laves phase (1.2 MPa·m1/2). The formation of ductile Nb and Cr solid solutions and fine grains were considered to be the reason for the remarkable enhancements in mechanical properties.

Keywords

Laves phasespark plasma sinteringmechanical properties
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 3 , 15 February 2016 , pp. 380 - 387
Copyright
Copyright © Materials Research Society 2016 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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