Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 24    No. 8    August 2014

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Hot deformation behaviors of 35%SiCp/2024Al metal matrix composites
Shi-ming HAO1,2, Jing-pei XIE3, Ai-qin WANG3, Wen-yan WANG3, Ji-wen LI3, Hao-liang SUN3

1. Physical Engineering College, Zhengzhou University, Zhengzhou 450052, China;
2. School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, China;
3. College of Materials Science and Engineering, Henan University of Science and Technology,
Luoyang 471023, China

Abstract:The hot deformation behaviors of 35%SiCp/2024 aluminum alloy composites were studied by hot compression tests using Gleeble-1500D thermo-mechanical simulator at temperatures ranging from 350 to 500 °C under strain rates of 0.01-10 s-1. The true stress-true strain curves were obtained in the tests. Constitutive equation and processing map were established. The results show that the flow stress decreases with the increase of deformation temperature at a constant strain rate, and increases with the increase of strain rate at constant temperature, indicating that composite is a positive strain rate sensitive material. The flow stress behavior of composite during hot compression deformation can be represented by a Zener-Hollomon parameter in the hyperbolic sine form. Its activation energy for hot deformation Q is 225.4 kJ/mol. To demonstrate the potential workability, the stable zones and the instability zones in the processing map were identified and verified through micrographs. Considering processing map and microstructure, the hot deformation should be carried out at the temperature of 500 °C and the strain rate of 0.1-1 s-1.


Key words: metal matrix composites; constitutive equations; processing map; microstructure; powder metallurgy

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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