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Synthesis, microstructure evolution, and mechanical properties of (Cr1–x Vx )2AlC ceramics by in situ hot-pressing method

Published online by Cambridge University Press:  12 May 2014

Jianfeng Zhu ,
Hao Jiang ,
Fen Wang  and
Qi Ma
Jianfeng Zhu
Affiliation:
Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi’an 710021, China
Hao Jiang*
Affiliation:
Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi’an 710021, China
Fen Wang
Affiliation:
Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi’an 710021, China
Qi Ma*
Affiliation:
Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi’an 710021, China
*
a) Address all correspondence to this author. e-mail: haojiangcd@163.com
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Abstract

Nearly dense and almost single-phase bulk (Cr1–x Vx )2AlC (x = 0, 0.25, 0.5, 0.75, and 1.0) ceramics were successfully fabricated by in situ hot-pressing method using Cr, V, Al, and C powders as raw materials. A possible synthesis mechanism was proposed to explain the formation of (Cr1–x Vx )2AlC solid solutions. The lattice parameters, microstructure, and mechanical properties of the (Cr1–x Vx )2AlC ceramics were investigated in detail. The results indicated that the lattice parameters increased with the substitution of Cr by V and the aspect ratio of the grain changed from 1.4 to 3.2. The dependence of the mechanical properties on the V content was a single-peak type. The (Cr0.5V0.5)2AlC ceramic possessed the optimal mechanical performance and its Vickers hardness, flexural strength, and fracture toughness reached the maximum values of 5.18 GPa, 402 MPa, 5.91 MPa m1/2, respectively, due to the solid solution effect. The energy-consuming mechanisms of the material were also discussed.

Keywords

hot pressingmicrostructurescanning electron microscopy (SEM)

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Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 10 , 28 May 2014 , pp. 1168 - 1174
Copyright
Copyright © Materials Research Society 2014 

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