Journal of Materials Research

Articles

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

Yuelei Baia1, Xiaodong Hea2 c1, Yibin Lia3, Chuncheng Zhua4 and Sam Zhanga5 c2

a1 Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China

a2 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

a3 Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China

a4 Department of Chemistry, Harbin Normal University, Harbin 150000, China

a5 School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798

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.

(Received January 14 2009)

(Accepted May 09 2009)

Key Words:

  • Combustion synthesis (SHS);
  • Compound;
  • Hot isostatic pressing (HIP)

Correspondence:

c1 Address all correspondence to this author. e-mail: xdhe@hit.edu.cn

c2 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

0Comments
Related Content