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Thermal Analysis of Cerium-Treated Chill-Cast Al-23 Si Alloy

  • V. Vijeesh
  • K. Narayan Prabhu
Article

Abstract

The influence of elemental cerium addition on the cooling curve parameters and microstructure of hypereutectic Al-23Si alloy was investigated in this work. The cooling rate of the treated and untreated alloy samples was varied by solidifying the melt against chills of different materials in a stainless-steel tube. The cooling curve was recorded and nucleation temperatures of various phases in the alloy were measured. The results show that the chilling improves the effectiveness of the modifier. The two main phases of the alloy, primary silicon and eutectic silicon, were nucleated at temperatures of about 661.2 and 571.6 °C, respectively. The addition of Ce to slowly cooled alloys resulted in an increase in undercooling temperature of both the phases, with a decrease in its nucleation temperature, whereas the same additions increased the nucleation temperatures in chilled alloys. Based on the thermal analysis results, a relation between thermal analysis parameter (\(\Delta T_{G}\)) and silicon particle size of the alloy was proposed.

Keywords

Al-23 Si alloy Ce treatment cooling rate modification refinement thermal analysis 

Notes

Acknowledgments

One of the authors (VV) gratefully acknowledges the faculties and laboratory technicians of the Department of Metallurgical and Materials Engineering, NITK Surathkal, India, for their support and assistance in completing this work as a part of the Ph.D. thesis.

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Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringN.M.A.M Institute of TechnologyNitte, UdupiIndia
  2. 2.Department of Metallurgical and Materials EngineeringNational Institute of Technology KarnatakaMangaluruIndia

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