Structural and Mechanical Behavior of Al-4.4Cu/2TiB2In-Situ Nanocomposites Fabricated by Post-In-Situ Reaction Ultrasonic Processing

Al-4.4Cu/TiB 2 composites were fabricated with and without post- in-situ reaction ultrasonic melt treatment. The structural and mechanical behaviors of the composites in both the as-cast (F) and T6—peak-aged conditions were analyzed and compared with the base alloy Al-4.4Cu. The microstructural resu...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2020-02, Vol.51 (1), p.149-160
Main Authors: Nampoothiri, Jayakrishnan, Balasundar, I., Raghu, T., Ravi, K. R.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Materials Science
Mechanical properties
Metallic Materials
Nanocomposites
Nanotechnology
Structural Materials
Surfaces and Interfaces
Thin Films
Titanium diboride
Ultrasonic processing
Yield strength
Yield stress
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Summary:Al-4.4Cu/TiB 2 composites were fabricated with and without post- in-situ reaction ultrasonic melt treatment. The structural and mechanical behaviors of the composites in both the as-cast (F) and T6—peak-aged conditions were analyzed and compared with the base alloy Al-4.4Cu. The microstructural result reveals that the ultrasonic-assisted processing enhanced the dispersion of nano-sized TiB 2 particles. The ultrasonic treatment-assisted fabrication has improved the yield strength of Al-4.4Cu/2TiB 2 composite about ~ 2 times over the monolithic Al-4.4Cu alloy in both the as-cast and peak-aged condition while retaining > 90 pct ductility of the matrix alloy. The various strengthening mechanisms operating in the materials, namely, base alloy, micro- and nanocomposite were discussed and the theoretical yield strength was estimated using appropriate equations. The theoretical yield strength estimates were found to correlate well with the experimental observations.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-019-01713-x