مقاله انگلیسی رایگان در مورد توصیف خصوصیات کامپوزیت های آلیاژ آلومینیوم SiCp/2024 – الزویر ۱۹۹۹

Abstract

In the present work, SiCp/2024 composite powders were produced by low energy ball milling a mixture of centrifugally atomized 2024 particles and β-SiC reinforcements having a size range between 2 and 6 μm. The experimental parameters studied were the milling time (between 1 and 24 h) and the volume proportion of β-SiC in the starting powder mixture (between 5 and 35%). These SiCp/2024 composite powders were consolidated by hot extrusion using optimized processing parameters. The microstructure of the extruded composites showed a uniform distribution of β-SiC particles in the 2024 aluminum matrix. Moreover, the mechanical properties (yield strength and Young’s modulus) improved with the SiC content although some reduction in ductility was observed.

Introduction

For more than two decades, aluminum-matrix composites have been made by different methods including casting [1–۹], spray atomization and codeposition [9,10], pressure-infiltration of porous ceramic preforms [11], and powder metallurgy techniques like densification of mixtures of metal and ceramic powders [12–۱۷], or of composite powders made by mechanical processing [13,18–۳۴]. The mechanical properties of these composites are influenced significantly by the quantity and mode of distribution of the reinforcements and also by the nature of the interfaces between the reinforcements and the matrix.