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Effect of SiCp volume fraction on the microstructure and tensile properties of SiCp/2024 Al-based composites prepared by powder thixoforming

Published online by Cambridge University Press:  30 August 2016

Pubo Li  and
Tijun Chen
Pubo Li*
Affiliation:
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
Tijun Chen*
Affiliation:
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
*
b) e-mail: lipubogs@163.com
a) Address all correspondence to these authors. e-mail: chentj1971@126.com
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Abstract

A new technology for preparing and forming ceramic particle-reinforced metal matrix composites, powder thixoforming, has been proposed. The effect of the SiCp volume fraction on the microstructure and tensile properties of thixoforged SiCp/2024 Al-based composites was studied. The results indicated that the volume fraction affected the effective liquid fraction, primary particle size and shape, and microstructure compactness. A composite with 10 vol% SiCp had the best comprehensive tensile properties, an ultimate tensile strength of 388 MPa, a yield strength of 295 MPa, and an elongation of 3.8%, representing increases of 29.3 and 33.5%, and a decrease of 63.5%, respectively, compared with the values for the thixoforged 2024 Al matrix alloy. During tensile testing, cracks were initiated in the secondary solidified structures, the debonded SiC/Al interface, and the cracked SiCp. For composites containing over 10 vol% SiCp, agglomerated SiCp acted as additional zones of crack initiation.

Keywords

powder processingcompositefracture

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Type
Articles
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Journal of Materials Research , Volume 31 , Issue 18: Focus Section: Reinventing Boron Chemistry for the 21st Century , 28 September 2016 , pp. 2850 - 2862
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Copyright © Materials Research Society 2016 

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