Abstract

Nowadays, light part production by the strategies of performance improving known as 'Engine Downsizing' by decreasing the engine size is popular. Al-Zn-Mg alloyed composites reinforced by SiC particle are mostly produced by powder metallurgy. In fact, Liquid mixing casting technique alternatively developed against the powder metallurgy has more than advantageous when taking into the consideration of its production capacity, production cost and part production similar to the definitive form. In this study, the hardness variation of SiC particle reinforced composites manufactured by the method of affordable 'Vortex Casting' and in different amounts by weight and 7075 alloy after aging process in different times at 140℃ and 230℃ was reviewed and their microstructure analyses were made accordingly. After 16 hours aging of 7075 alloy and the composites reinforced by 5% SiC at 140℃ and 12 hours aging in the composites reinforced by 3% SiC, at 230℃, after 9 hours aging in all materials, the maximum hardness value was measured. In higher aging temperature, due to the fact that max hardness was achieved in shorter period, in lower aging temperature, higher hardness was achieved.

Highlights

  • The requirements of producing more quality products and marketing such products with low costs oblige the development of new generation materials

  • Instead of forging aluminum alloys in the automotive piston groove, when using A1 matrix composites reinforced by SiC particle, 50% increasing in the elastic module, 10% decreasing in the weight have been provided [5]

  • By applying aging process at 40oC and 230oC for 3, 6, 9, 12, 16, 20 and 40 hours to the composites produced by Vortex method with 7075 alloy and 7075 Al alloy matrix reinforced by 3% and 5% SiC particle; their hardness variation was reviewed

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Summary

Introduction

The requirements of producing more quality products and marketing such products with low costs oblige the development of new generation materials. Aluminum alloy is produced from the SiC particle reinforced composited with matrix and automative parts where the hardness and wearing properties are very important, such as segments, brake pedal, pistons, cylinders and pulleys [1, 2]. The. Development of performance increasing strategies is important by decreasing the engine volume. Instead of forging aluminum alloys in the automotive piston groove, when using A1 matrix composites reinforced by SiC particle, 50% increasing in the elastic module, 10% decreasing in the weight have been provided [5]. Application areas of MMK materials are not limited to the engine parts, NASA and American Air Forces have carried out many studies for this purpose [6]. Due to the fact that MMK reinforced by the particle has better mechanical, isotropic and physical properties than others

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