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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Печать: 1093-3611
ISSN Онлайн: 1940-4360

Выпуски:
Том 23, 2019 Том 22, 2018 Том 21, 2017 Том 20, 2016 Том 19, 2015 Том 18, 2014 Том 17, 2013 Том 16, 2012 Том 15, 2011 Том 14, 2010 Том 13, 2009 Том 12, 2008 Том 11, 2007 Том 10, 2006 Том 9, 2005 Том 8, 2004 Том 7, 2003 Том 6, 2002 Том 5, 2001 Том 4, 2000 Том 3, 1999 Том 2, 1998 Том 1, 1997

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.2016016824
pages 291-305

EXPERIMENTAL INVESTIGATION OF SURFACE HARDNESS AND DRY SLIDING WEAR BEHAVIOR OF AA7050/B4Cp

Ranjith Rajamanickam
Department of Mechanical Engineering, Sri Ranganathar Institute of Engineering and Technology, Coimbatore 641110, India
P. K. Giridharan
Department of Mechanical Engineering, Kumaraguru College of Technology, Coimbatore — 641049, Tamil Nadu, India

Краткое описание

In this work, AA7050 aluminum alloy reinforced with B4C particles of average particle size 25 µm is examined. The composites are invented by varying the weight percentage of B4C particles in the liquid stir casting route. K2TiF6 is added as a flux to overcome the wetting problem between B4C and molten aluminum alloy. The influence of reinforcement, sliding velocity, sliding distance, and of applied load on the wear rate is studied using a pin-on-a disc equipment in experiments. Optical, scanning electron microscopy, and EDX analysis are performed to characterize the samples. The influence of high-temperature spark produced during electric discharge machining on composite materials was analyzed. The Rockwell hardness tests were compared on as cast worn and electric discharge-machined surfaces. The hardness of the composites increases, whereas the coefficient of friction decreases with addition of B4Cp. The hardness value of a worn surface was higher than as cast composites in all cases due to the presence of a ferrous metal, with its presence being confirmed by energy dispersive X-ray analysis. The hardness value of the electric discharge-machined surface of composites was lower than unreinforced aluminum alloy due to the increase in the gap distance. There is an improvement in wear resistance due to the forming of a tribo-rich mechanically mixed layer. The presence of iron and oxygen in the worn surface confirmed the MML and oxidation reaction. The B4C-reinforced composites show better wear resistance than a pure aluminum alloy.

Ключевые слова: aluminum matrix composites, wear, stir casting, B4C, EDM

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