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A multiscale experimental analysis of mechanical properties and deformation behavior of sintered copper-silicon carbide composites enhanced by high-pressure torsion

Nosewicz Szymon, Bazarnik Piotr, Clozel Melanie, Kurpaska Łukasz, Jenczyk Piotr, Jarząbek Dariusz, Chmielewski Marcin, Romelczyk-Baishya Barbara, Lewandowska Malgorzata, Pakieła Zbigniew, Huang Yi, Langdon Terence G.

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 3

776--794

Experiments were conducted to investigate, within the framework of a multiscale approach, the mechanical enhancement, deformation and damage behavior of copper–silicon carbide composites (Cu–SiC) fabricated by spark plasma sintering (SPS) and the combination of SPS with high-pressure torsion (HPT). The mechanical properties of the metal–matrix composites were determined at three different length scales corresponding to the macroscopic, micro- and nanoscale. Small punch testing was employed to evaluate the strength of composites at the macroscopic scale. Detailed analysis of microstructure evolution related to SPS and HPT, sample deformation and failure of fractured specimens was conducted using scanning and transmission electron microscopy. A microstructural study revealed changes in the damage behavior for samples processed by HPT and an explanation for this behavior was provided by mechanical testing performed at the micro- and nanoscale. The strength of copper samples and the metal–ceramic interface was determined by microtensile testing and the hardness of each composite component, corresponding to the metal matrix, metal–ceramic interface, and ceramic reinforcement, was measured using nano-indentation. The results confirm the advantageous effect of large plastic deformation on the mechanical properties of Cu–SiC composites and demonstrate the impact on these separate components on the deformation and damage type.

Experimental investigations of reciprocating wear behavior of metal matrix (Ti/TiB) composites

Selvakumar Mani, Ramkumar Thulasiram, Mohanraj Murugesan, Chandramohan Palanisamy, Narayanasamy Pandiyarajan

Archives of Civil and Mechanical Engineering

2020

Vol. 20, no. 1

366--374

In this paper, the reciprocating wear behavior of titanium–titanium boride composites with 20 and 40 (by vol. %) titanium boride (TiB) particles IS investigated in dry sliding conditions against Al2O3 ceramic balls. The trials have been observed at three loading conditions such as 5, 10 and 15 N load. The composites were processed by three powder metallurgical tech-niques such as spark plasma sintering (SPS), vacuum sintering (VS) and hot isostatic pressing (HIP). The electron probe microanalysis (EPMA) was used to analyze the homogeneity of Ti and boride phases in the composites. The hardness and indentation fracture resistance were evaluated using nano-indentation technique. The load–depth curves of indents for Ti–TiB shows the deviations of the modulus of elasticity within the spark plasma sintering (SPS), vacuum sintering (VS) and hot isostatic pressing (HIP).The wear resistance of the fabricated samples was analyzed using reciprocating wear tester. The SPS composite (Ti–38.5% TiB) showed lower coefficient of friction (0.07), lower wear volume (0.4368 mm3) and wear rate (0.000276 mm3/m) when compared to HIP and VS, which is attributed to the presence of fine titanium boride needles of high hardness, contributing to improving wear resistance. The surface morphology reveals that the composites processed through spark plasma sintering (SPS) and hot isostatic pressing (HIP) are subjected to minor plastic deformation. The outcome of this work is more beneficial to automotive brake pad, precision manufacturing and locomotives to avoid critical wear failures.