Showing papers by "Srinivasa R. Bakshi published in 2013"
10 Jan 2013-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the porosity in the composites was associated with carbon nanotubes (CNTs) and the distribution of CNTs was found to be different in axial and transverse directions.
Abstract: Copper (Cu) matrix composites reinforced with 0.2, 5 and 10 vol% single wall carbon nanotubes (SWCNT) and 5 and 10 vol% multi-wall carbon nanotubes (MWCNT) were processed by high energy milling of pure copper powder with carbon nanotubes (CNTs) and subsequent consolidation by vacuum hot pressing. Microstructural observations of the sintered composites revealed equiaxed twinned microstructure for 0.2 vol% SWCNT composite and elongated grain structure, with CNT layers in between, in composites having higher CNTs content. The porosity in the composites was associated with CNT layers. The distribution of CNTs was found to be different in axial and transverse directions. Significant improvement in hardness of Cu–SWCNT composite was observed with increase in CNTs content. Whereas, in case of MWCNT composite, hardness reduced for 10 vol% CNT composites. Compression strength of the SWCNT samples was found to be higher than the MWCNT reinforced samples.
74 citations
TL;DR: In this paper, the rupture strength depends on the transformation behavior of the CNTs during spark plasma sintering, which is dependent on their length and their tubular structure.
46 citations
TL;DR: The deformation mechanism of the tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7 GPa, was investigated using high-resolution transmission electron microscopy.
44 citations
TL;DR: In this paper, a high-energy milling of pure copper powder with carbon nanotubes was performed in Attritor mill for 20h and powder samples were collected after every 5 hours intervals.
38 citations