Microstructure and bending behaviour of Thixocast (LM25 – SiC) Composite: Effect of processing temperature
Keywords:
Synthesis of LM25-10SiC composite, ThixocastingAbstract
In the present work, microstructure and mechanical properties of composite (LM25 -10 SiC) were correlated and compared between gravity cast and thixocast composite having the same composition. Thixocasting of samples was done at 590°C,600°C and 610°C in a cylindrical die. Microstructures and mechanical properties were observed, correlated and compared. The tensile strength, yield strength, hardness and percentage elongation of the thixocast samples were found to be higher than those of gravity cast samples. Improved mechanical properties of thixocast samples are due to non-dendritic globular structure and morphology of silicon particles. The size of dendrite and volume fraction of eutectic phases changes with thixocasting temperatures which causes changes in tensile properties and hardness.
References
de Figueredo A. Science and technology of semi-solid metal processing: North American Die Casting Assoc.; 2001.
Leo P, Cerri E. Silicon particle damage in a thixocast A356 aluminium alloy. Metallurgical Science and Tecnology. 2003;21.
Puettgen W, Bleck W, Hirt G, Shimahara H. Thixoforming of steels–a status report. Advanced Engineering Materials. 2007;9:231-45.
Masek B, Aisman D, Behulova M, Jirkova H. Structure of miniature components from steel produced by forming in semi-solid state. Transactions of Nonferrous Metals Society of China. 2010;20:s1037-s41.
Yurko J, Martinez R, Flemings M. The spheroidal growth route to semi-solid forming. Proceedings of the 8 th International Conference on Semisolid Processing of alloys and Composites, Limassol, Cyprus, Keynote2004.
Flemings MC. Behavior of metal alloys in the semisolid state. Metallurgical transactions A. 1991;22:957-81.
Kono K. Method and apparatus for manufacturing light metal alloy. Google Patents; 1998.
Martínez-Ayers RA. Formation and processing of rheocast microstructures: Massachusetts Institute of Technology; 2004.
Atkinson H. Current status of semi-solid processing of metallic materials. Advances in Material Forming: Springer; 2007. p. 81-98.
Modigell M, Pola A, Tocci M. Rheological characterization of semi-solid metals: a review. Metals. 2018;8:245.
Tuli A. Microstructure and Bending behaviour of Thixocast 2014 Alloy: Effect of processing temperature.
McLelland A, Atkinson H, Kapranos P, Kirkwood D. Thixoforming spray-formed aluminium/silicon carbide metal matrix composites. Materials letters. 1991;11:26-30.
