Recently, the superhardness of rhenium diboride films was reported. In this study the first successful preparation and characterization of ruthenium boride films is presented. The morphology, topography, microstructure and hardness of films, prepared by pulsed laser deposition, were investigated. The films, which are 0.7 mu m thick, have a dense grain texture, and are composed of two phases Ru(2)B(3) (main phase, 65% volume fraction) and RuB(2) (35%). The RuB(2) phase does not show any preferred orientation, while Ru(2)B(3) is textured preferentially along the (114) and (105) directions, with crystallite growth parallel within 1.9 degrees of average mismatch. The composite Vickers microhardness of the film substrate systems was measured, and the intrinsic hardness of the films was separated using an area law-of-mixtures approach. The obtained films were found to be superhard, the intrinsic film hardness value (49 GPa) being much higher than that for the RuB(2) bulk used as the target for film deposition and than that for the Ru(2)B(3) bulk. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Deposition and characterization of superhard biphasic ruthenium boride films / J. V., Rau; Latini, Alessandro; Amanda, Generosi; V., Rossi Albertini; D., Ferro; R., Teghil; S. M., Barinov. - In: ACTA MATERIALIA. - ISSN 1359-6454. - 57:3(2009), pp. 673-681. [10.1016/j.actamat.2008.10.009]
Deposition and characterization of superhard biphasic ruthenium boride films
LATINI, ALESSANDRO;
2009
Abstract
Recently, the superhardness of rhenium diboride films was reported. In this study the first successful preparation and characterization of ruthenium boride films is presented. The morphology, topography, microstructure and hardness of films, prepared by pulsed laser deposition, were investigated. The films, which are 0.7 mu m thick, have a dense grain texture, and are composed of two phases Ru(2)B(3) (main phase, 65% volume fraction) and RuB(2) (35%). The RuB(2) phase does not show any preferred orientation, while Ru(2)B(3) is textured preferentially along the (114) and (105) directions, with crystallite growth parallel within 1.9 degrees of average mismatch. The composite Vickers microhardness of the film substrate systems was measured, and the intrinsic hardness of the films was separated using an area law-of-mixtures approach. The obtained films were found to be superhard, the intrinsic film hardness value (49 GPa) being much higher than that for the RuB(2) bulk used as the target for film deposition and than that for the Ru(2)B(3) bulk. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
