caa a22 4500 388018410 CHVBK 20180307124917.0 cr unu---uuuuu 161130e199811 xx s 000 0 eng 10.1557/JMR.1998.0421 doi S0884291400046550 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0421 Interfaces and properties of Al - Si alloy zircon particulate composites [Elektronische Daten] Zircon-particle-dispersed Al−13.5Si−2.5Mg is a structural composite material being investigated for lightweight, tribological applications. The conventional, powder-processed material, in the temperature range of 22-100 °C, yielded a low coefficient of linear thermal expansion (CTE) of 7.8 × 10−6 °C at 0.15 volume fraction (Vf), a 64% reduction of that of the alloy. The dry sliding wear rate and the coefficient of friction measured by the pin-on-the-plate technique at 4 kg load decreased significantly by 99% and 35.5%, respectively. A significant reduction, by 29%, in wear rate of the alloy was observed to occur only when more than 0.03Vf zircon was dispersed. An x-ray study showed that the interface reaction products consist of compounds of Mg, Ce, Cu, and Nb. Tensile failure of the reaction-sintered parts revealed a ductile mode of fracture, with the path traversing both through voids and the bonded particles while interface failure was observed in parts without Mg. An analysis of both the tribological and tensile properties showed that an optimal performance of this alloy at 0.15Vf zircon is achieved when the Mg content is between 2.5 and 3.5 wt. %. Copyright © Materials Research Society 1998 Ejiofor J. U. Department of Metallurgical and Materials Engineering, The University of Alabama, P.O. Box 870202, Tuscaloosa, Alabama 35487 Reddy R. G. Department of Metallurgical and Materials Engineering, The University of Alabama, P.O. Box 870202, Tuscaloosa, Alabama 35487 Journal of Materials Research Cambridge University Press 13/11(1998-11), 3093-3099 0884-2914 13:11<3093 1998 13 JMR https://doi.org/10.1557/JMR.1998.0421 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0421 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ejiofor J. U. Department of Metallurgical and Materials Engineering, The University of Alabama, P.O. Box 870202, Tuscaloosa, Alabama 35487 NATIONALLICENCE 700 1- Reddy R. G. Department of Metallurgical and Materials Engineering, The University of Alabama, P.O. Box 870202, Tuscaloosa, Alabama 35487 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/11(1998-11), 3093-3099 0884-2914 13:11<3093 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge