In situ production of tantalum carbide nanodispersoids in a copper matrix by reactive milling and hot extrusion

Manotas-Albor, Milton; Vargas-Uscategui, Alejandro; Palma, Rodrigo; Mosquera, Edgar.

Keywords: copper, transmission electron microscopy, alloying, Tantalum carbide, Softening resistance, Reactive mechanical

Abstract

This paper presents a study of the in situ production of tantalum carbide nanodispersoids in a copper matrix. The copper matrix composites were produced by means of reactive milling in hexane (C6H14) followed by hot extrusion. The composite materials were characterized by means of optical emission spectroscopy (OES), X-ray fluorescence (XRF), scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and Vickers micro-hardness. The effect of milling time was analyzed in 10, 20 and 30 h in a composite with a nominal composition Cu–5 vol.% TaC. A systematic increase of the dislocations density and the carbon concentration were observed when the milling time was increased, whereas the crystallite size of the composite matrix decreased. The material milled for 30 h and hot-extruded showed a density of 9037 kg m3 (98.2% densification) and a softening resistance of 204 HV; however the latter value showed an abrupt drop after an annealing treatment at 923 K for 1 h. Finally, the TEM analysis showed the presence of tantalum carbide (Ta4C3) nanodispersoids.

Más información

Título de la Revista: JOURNAL OF ALLOYS AND COMPOUNDS
Volumen: Volume 598
Editorial: ELSEVIER SCIENCE SA
Fecha de publicación: 2014
Página de inicio: 126
Página final: 132
Idioma: English
Financiamiento/Sponsor: Mechanical Department, Universidad de Chile
Notas: ISI