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Rapid synthesis of bulk Ti2AlC by self-propagating high temperature combustion synthesis with a pseudo–hot isostatic pressing process

Published online by Cambridge University Press:  31 January 2011

Yuelei Bai ,
Xiaodong He ,
Yibin Li ,
Chuncheng Zhu  and
Sam Zhang
Yuelei Bai
Affiliation:
Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China
Xiaodong He*
Affiliation:
Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China; and School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798
Yibin Li
Affiliation:
Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China
Chuncheng Zhu
Affiliation:
Department of Chemistry, Harbin Normal University, Harbin 150000, China
Sam Zhang*
Affiliation:
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798
*
a) Address all correspondence to this author. e-mail: [email protected]
b) This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy
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Abstract

In this study, the dense polycrystalline Ti2AlC was synthesized by self-propagating high-temperature combustion synthesis with the pseudo–hot isostatic pressing process (SHS/PHIP). The resultant phase purity is highly dependent on the mol ratio of raw powders. The Ti2AlC was densified by applying pressure after the SHS reaction. The resultant sample mainly contains typical plate-like nonstoichiometric Ti2AlCx (x = 0.69) with grain size of ∼6 µm. The sample shows the Vickers hardness of 5.5 GPa, highest flexural strength of 431 MPa, compressive strength of 1033 MPa, and fracture toughness of 6.5 MPa·m1/2. No indentation cracks in Ti2AlCx were observed, indicative of a damage material nature. The reaction mechanism for the formation of SHS/PHIP-derived Ti2AlC is also discussed based on differential thermal analysis and x-ray diffraction results.

Keywords

Combustion synthesis (SHS)CompoundHot isostatic pressing (HIP)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 8 , August 2009 , pp. 2528 - 2535
Copyright
Copyright © Materials Research Society 2009

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