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Investigation on Equal-Channel Angular Pressing-Induced Grain Refinement in an Aluminum Matrix Composite Reinforced with Al-Cu-Ti Metallic Glass Particles

  • M. R. Rezaei
  • S. G. ShabestariEmail author
  • S. H. Razavi
Article
  • 68 Downloads

Abstract

In the present study, a homogeneous ultrafine grain structure composite consisting of metallic glass particles reinforcements was developed by equal-channel angular pressing (ECAP) process. The microstructure of composite was characterized using x-ray diffraction (XRD), transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) techniques. The uniaxial compression test was used to determine the mechanical properties. The mechanisms of grain refinement during ECAP process were discussed based on the microstructural evolutions. A composite was successfully produced after four passes of ECAP, having an average grain size of 610 nm and compressive yield strength of 242 MPa. Also, the yield strength of composite after each pass was quantitatively estimated by considering all the effective strengthening mechanism. The findings showed that the dislocations strengthening mechanism with contribution of more than 50% plays a major role in strengthening the composite. There was a negligible gap between the experimental and theoretical values of yield strength for all ECAP pass numbers.

Keywords

composite (metallic matrix) equal-channel angular pressing (ECAP) mechanical (static) metallic glasses microscopy (electron) strengthening mechanisms x-ray 

Notes

Acknowledgments

The authors are thankful to Center of Excellence for High Strength Alloys Technology (CEHSAT) of IUST University. They also gratefully acknowledge Dr. Stefan Zaefferer for performing EBSD measurements at Max Planck Institute for Iron Research.

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Copyright information

© ASM International 2019

Authors and Affiliations

  1. 1.School of Metallurgy and Materials EngineeringIran University of Science and Technology (IUST)Narmak, TehranIran
  2. 2.School of EngineeringDamghan UniversityDamghanIran

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