In the present study, in situ reaction technique has been employed to prepare AA5052 matrix composites reinforced with different vol. % of ZrB2 particles (i.e., 0, 4.5, and 9 vol. %). Composites have been characterized by X-ray diffraction (XRD) to confirm the in situ formation of ZrB2 particles in the matrix. Optical Microscopy (OM) studies reveal the refinement of aluminum-rich phase due to the presence of ZrB2 particles. Scanning electron microscopy (SEM) studies reveal size and distribution of ZrB2 particles while transmission electron microscopy (TEM) reveals the presence of dislocations in the matrix around ZrB2 particles. Hardness and tensile testing of composites have been carried out at room temperature to evaluate the mechanical properties. The results reveal the improvement in hardness and strength with increased amount of ZrB2 particles. Strength of AA5052/ZrB2 in situ composites has been analyzed by various strengthening mechanism models. The analysis revealed that Orowan and Solid solution strengthening mechanisms are the predominant mechanism for high strength composites. Theoretical yield strength is about 6–10% higher than the experimental values due to clustering tendency of ZrB2 particles.
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January 2017
Research-Article
A Study on Mechanical Properties and Strengthening Mechanisms of AA5052/ZrB2 In Situ Composites
Narendra Kumar,
Narendra Kumar
Department of Mechanical Engineering,
B.I.E.T Jhansi,
Jhansi 284128, India
e-mail: narendra.dharwan@gmail.com
B.I.E.T Jhansi,
Jhansi 284128, India
e-mail: narendra.dharwan@gmail.com
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Gaurav Gautam,
Gaurav Gautam
Department of Physics,
I.I.T (BHU) Varanasi,
Varanasi 221005, India
I.I.T (BHU) Varanasi,
Varanasi 221005, India
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Rakesh Kumar Gautam,
Rakesh Kumar Gautam
Department of Mechanical Engineering,
I.I.T (BHU) Varanasi,
Varanasi 221005, India
I.I.T (BHU) Varanasi,
Varanasi 221005, India
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Anita Mohan,
Anita Mohan
Department of Physics,
I.I.T (BHU) Varanasi,
Varanasi 221005, India
I.I.T (BHU) Varanasi,
Varanasi 221005, India
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Sunil Mohan
Sunil Mohan
Department of Metallurgical Engineering,
I.I.T (BHU) Varanasi,
Varanasi 221005, India
I.I.T (BHU) Varanasi,
Varanasi 221005, India
Search for other works by this author on:
Narendra Kumar
Department of Mechanical Engineering,
B.I.E.T Jhansi,
Jhansi 284128, India
e-mail: narendra.dharwan@gmail.com
B.I.E.T Jhansi,
Jhansi 284128, India
e-mail: narendra.dharwan@gmail.com
Gaurav Gautam
Department of Physics,
I.I.T (BHU) Varanasi,
Varanasi 221005, India
I.I.T (BHU) Varanasi,
Varanasi 221005, India
Rakesh Kumar Gautam
Department of Mechanical Engineering,
I.I.T (BHU) Varanasi,
Varanasi 221005, India
I.I.T (BHU) Varanasi,
Varanasi 221005, India
Anita Mohan
Department of Physics,
I.I.T (BHU) Varanasi,
Varanasi 221005, India
I.I.T (BHU) Varanasi,
Varanasi 221005, India
Sunil Mohan
Department of Metallurgical Engineering,
I.I.T (BHU) Varanasi,
Varanasi 221005, India
I.I.T (BHU) Varanasi,
Varanasi 221005, India
1Corresponding author.
Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received September 9, 2015; final manuscript received August 27, 2016; published online October 6, 2016. Assoc. Editor: Said Ahzi.
J. Eng. Mater. Technol. Jan 2017, 139(1): 011002 (8 pages)
Published Online: October 6, 2016
Article history
Received:
September 9, 2015
Revised:
August 27, 2016
Citation
Kumar, N., Gautam, G., Gautam, R. K., Mohan, A., and Mohan, S. (October 6, 2016). "A Study on Mechanical Properties and Strengthening Mechanisms of AA5052/ZrB2 In Situ Composites." ASME. J. Eng. Mater. Technol. January 2017; 139(1): 011002. https://doi.org/10.1115/1.4034692
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