Extruding of Al-Al2O3 composites fabricated by stir-casting process

سال انتشار: 1391
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,552

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شناسه ملی سند علمی:

IIAC02_005

تاریخ نمایه سازی: 12 اردیبهشت 1392

چکیده مقاله:

Aluminum matrix composites (AMCs) reinforced with Al2O3 particles are widely used for high performance applications such as automotive, military, aerospace and electricity industries because of their improved physical and mechanical properties. In this study, in order to improve the wettability and distribution of reinforcement particles within the matrix, a novel tow step mixing method was used. The process included injection of particles within the molten aluminum by inert argon gas and stirring the melt at fixed speed. Different weight fractions of micro (3, 5 and 7wt. %) alumina particles were injected by argon gas into the melt aluminum and stirred by a mechanical stirrer with t speed of 300 rpm. Then fabricated samples were extruded. The microstructure of the composite samples was investigated by Optical Microscopy (OP). Also, density, hardness, Yield and Ultimate stress variations of micro composites were measured. The microstructure results shows when 3 and 5 wt.% alumina are added to the melt the particles are dispersed uniformly with low agglomeration at the matrix while the further addition (7wt.% Al2O3) of particles causes the agglomeration of particles. Also, application of the injection and extrusion processes led to a uniform distribution of particles in the matrix. The density measurements showed that the amount of porosity in the composites increased with increasing weight fraction and speed of stirring and decreased by extrusion process. Hardness, yield and ultimate strength of the extruded composites increases with increasing particles weight fraction to 7Wt. % and for without extrusion composites increase with particles weight fraction to 5Wt. %.

نویسندگان

M. Torabi Parizi

Department of Materials Science and Metallurgical Engineering, Engineering Faculty,Azad University of Saveh, Saveh, Iran.

H. R. Ezatpour

Department of Materials Science and Metallurgical Engineering, Engineering Faculty,Ferdowsi University of Mashhad, Mashhad, Iran.

S. A. Sajjadi

Department of Materials Science and Metallurgical Engineering, Engineering Faculty,Ferdowsi University of Mashhad, Mashhad, Iran.

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