Conference Papers
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Item Severe plastic deformation of Al-15Zn-2Mg alloy: Effect on wear properties(Trans Tech Publications Ltd ttp@transtec.ch, 2019) Manjunath, G.K.; Bhat, K.U.; Preetham Kumar, G.V.In the present work, Al-Zn-Mg alloy having highest zinc content was deformed by one of the severe plastic deformation (SPD) technique, equal channel angular pressing (ECAP) and effect of ECAP on the microstructure evolution and the wear properties were studied. ECAP was performed in a split die and the channels of the die are intersecting at an angle of 120°. ECAP was attempted at least possible temperature and the alloy was successfully ECAPed at 423 K. Below this temperature samples were failed in the first pass itself. After ECAP, significant drop in the grain size was reported. Also, ECAP leads to significant raise in the microhardness of the alloy. Predominantly, after ECAP, upsurge in the wear resistance of the alloy was noticed. To figure out the response of ECAP on the wear properties of the alloy; worn surfaces of the wear test samples were analyzed in SEM. © 2019 Trans Tech Publications Ltd, Switzerland.Item Tribological behaviour of aluminium-zinc-magnesium alloy processed by equal channel angular pressing(Elsevier Ltd, 2020) Manjunath, G.K.; Bhat, K.U.; Preetham Kumar, G.V.In the present work, tribological behaviour of the Al-5Zn-2 Mg alloy processed by equal channel angular pressing (ECAP) was studied. Initially, the alloy was prepared by die casting process. ECAP processing was carried out in a split die with an angle of 120° between two channels. ECAP processing was carried out at 150 °C in route BC upto four passes. After ECAP, noticeable decrease in the grain size was observed which leads to significant increase in the hardness and strength of the alloy. In homogenized condition, grain size of 180 mm was observed. While after four passes, grain size was reduced to 1-2 mm. After ECAP, the hardness and strength of the alloy was increased by 122% and 135%, respectively from the initial condition. Predominantly, after ECAP, noticeable decrease in the wear volume loss and coefficient friction of the material was observed. To understand the effect of ECAP on the tribological behaviour of the alloy; worn surfaces of the wear test samples were studied by using scanning electron microscope. © 2020 Elsevier Ltd. All rights reserved.