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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 2    September 2009

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Effects of extrusion deformation on mechanical properties of sub-micron Si3N4p/2024 composite
XIU Zi-yang(修子扬)1, CHEN Guo-qin(陈国钦)2, LIU Yan-mei(刘艳梅)2,
YANG Wen-shu(杨文澍)2, WU Gao-hui(武高辉)2

1. Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150001, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract:Si3N4p/2024Al composite was fabricated by squeeze casting method and treated by extrusion deformation. Microstructure analyses indicate that Si3N4 particles in the composite are in cylindrical polyhedron shape. Extrusion deformation is beneficial to uniform distribution of Si3N4 particles and improves the relative density of Si3N4p/2024Al composite. Tensile strength of Si3N4p/2024Al composite increases by 76.6% after T6 treatment, and after extrusion and T6 treatment it is by 57.6% more than T6 treatment only. Elastic modulus of Si3N4p/2024Al composite increases a little after T6 treatment but increases by 33.5% after extrusion deformation.

 

Key words: Si3N4p/2024Al composite; extrusion deformation; mechanical properties

ISSN 1672-7029
CN 43-1423/U

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