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Tensile properties and strengthening mechanisms of SiCp-reinforced aluminum matrix composites as a function of relative particle size ratio

Published online by Cambridge University Press:  23 July 2013

Shiming Hao  and
Jingpei Xie
Shiming Hao
Affiliation:
Physical Engineering College and Laboratory of Materials Physics of the Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China
Jingpei Xie*
Affiliation:
College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Metal matrix composites manufactured by the powder metallurgy route often exhibit different tensile strength due to particle geometrical reasons. The tensile strength tendency was studied in 2024 Al/30% SiCp composites as a function of relative particle size (RPS) ratio between the matrix and reinforcement particles. Dry blended composite powders, with different RPS ratios, were hot-pressed in vacuum, their microstructures were observed, and their tensile properties were measured. It was found that a decrease in RPS ratio resulted in a decrease in tensile strength, as a result of improved distribution of the SiCp. Despite their low density and heterogeneous distribution, 3-μm SiCp-reinforced composites had maximum tensile strength. The main reasons were due to the few fracture for small SiCp and the strengthening of the matrix microstructure from small particle effects. Solution treatment plus aging of the composites with the RPS ratio of 10:3 resulted in a significant improvement (42%) in strength due to the smaller diffusion path length for the alloying element.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 15 , 14 August 2013 , pp. 2047 - 2055
Copyright
Copyright © Materials Research Society 2013 

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