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Technical Briefs

Characterization of Rapidly Consolidated Titanium Diboride

[+] Author and Article Information
Kunal Kothari

Department of Aerospace Engineering, University of Maryland, College Park, MD 20724kotharik@gmail.com

Ramachandran Radhakrishnan

Department of Aerospace Engineering, University of Maryland, College Park, MD 20724radha38@hotmail.com

Norman M. Wereley

Department of Aerospace Engineering, University of Maryland, College Park, MD 20724wereley@umd.edu

J. Eng. Mater. Technol 133(2), 024501 (Mar 23, 2011) (4 pages) doi:10.1115/1.4003599 History: Received September 16, 2010; Revised January 25, 2011; Published March 23, 2011; Online March 23, 2011

This study reports on the microstructure and mechanical properties of titanium diboride (TiB2) that was rapidly consolidated via plasma pressure compaction (P2C®). Titanium diboride powder with 2.5wt% of silicon nitride (Si3N4), as a sintering aid, was rapidly consolidated using P2C® to inhibit grain growth and ensure high strength and ductility of the consolidated material. The consolidated specimens were 93.5% of theoretical density. The microstructure of the consolidated material was characterized using optical microscopy, scanning electron microscopy, and wavelength dispersive spectroscopy. Oxygen concentration in the consolidated sample was 13.55% less than in the as-received powders. The flexure strength, fracture toughness, Young’s modulus, and Vickers hardness of the consolidated specimens were measured at room temperature and were found to be equivalent if not superior to those reported in the literature.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Plasma pressure compaction (a) process and (b) setup

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Figure 2

Consolidation profile for plasma pressure compaction used in this study (9)

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Figure 3

0.25 in. thick P2C® consolidated TiB2 sample

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Figure 4

Bend bar (a) mounted with strain gauge and (b) loaded in a four-point bending test fixture

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Figure 5

SEM micrograph of P2C® consolidated TiB2 specimen at (a) 2000× and (b) 5000×

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Figure 6

Fracture SEM micrograph of P2C® consolidated TiB2: (a) bend bar and (b) chevron notched bar

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Figure 7

Fracture SEM micrograph of P2C® consolidated at TiB2 bend bar at (a) 5000× and (b) 7500×

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Figure 8

Stress versus strain plot for P2C® consolidated TiB2

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