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Solid–Solid Solutions

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Negative Additive Manufacturing of Complex Shaped Boron Carbides

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Published on: September 18, 2018

Toward inexpensive superhard materials: tungsten tetraboride-based solid solutions.

Reza Mohammadi¹, Miao Xie, Andrew T Lech

¹Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California, USA.

Journal of the American Chemical Society

|November 23, 2012

Summary

This summary is machine-generated.

Researchers enhanced tungsten tetraboride (WB(4)) hardness by creating solid solutions with tantalum, manganese, and chromium. The hardest material achieved a Vickers hardness of 57.3 GPa, showing potential for advanced material applications.

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Area of Science:

Materials Science
Solid-state Chemistry

Background:

Tungsten tetraboride (WB(4)) is a cost-effective material within the late transition-metal borides.
Enhancing its hardness is crucial for expanding its applications.

Purpose of the Study:

To synthesize and characterize WB(4) solid solutions with tantalum (Ta), manganese (Mn), and chromium (Cr).
To investigate the effect of these additions on the hardness and structural properties of WB(4).

Main Methods:

Solid solutions were synthesized using arc melting.
Elemental and phase purity were analyzed using energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD).
Vickers hardness was measured via microindentation, and high-pressure XRD was used to determine bulk modulus.

Main Results:

Solubility limits were determined: <10 at.% for Cr, <20 at.% for Mn, and >20 at.% for Ta in WB(4).
Optimized hardness values reached 57.3 ± 1.9 GPa for W(0.93)Ta(0.02)Cr(0.05)B(4) at 0.49 N load.
The hardest solid solution exhibited a bulk modulus of 335 ± 3 GPa and suppressed a pressure-induced phase transition.

Conclusions:

Ternary solid solutions of WB(4) with Ta and Cr significantly enhance hardness.
The developed W-Ta-Cr-B(4) material shows superior mechanical properties and phase stability under pressure.