Investigation on Equal-Channel Angular Pressing-Induced Grain Refinement in an Aluminum Matrix Composite Reinforced with Al-Cu-Ti Metallic Glass Particles
- 68 Downloads
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.
Keywordscomposite (metallic matrix) equal-channel angular pressing (ECAP) mechanical (static) metallic glasses microscopy (electron) strengthening mechanisms x-ray
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.
- 32.B.E. Warren, X-ray Diffraction, Courier Corporation, New York, 1969Google Scholar
- 36.F.J. Humphreys and M. Hatherly, Recrystallization and Related Annealing Phenomena, Elsevier, Amsterdam, 2012Google Scholar
- 50.S. Sivasankaran, K. Sivaprasad, R. Narayanasamy, and V.K. Iyer, Effect of Strengthening Mechanisms on Cold Workability and Instantaneous Strain Hardening Behavior During Grain Refinement of AA 6061-10wt.% TiO2 Composite Prepared by Mechanical Alloying, J. Alloys Compd., 2010, 507(1), p 236–244CrossRefGoogle Scholar