Research Papers

A Study on Mechanical Properties and Strengthening Mechanisms of AA5052/ZrB2 In Situ Composites

[+] Author and Article Information
Narendra Kumar

Department of Mechanical Engineering,
B.I.E.T Jhansi,
Jhansi 284128, India
e-mail: narendra.dharwan@gmail.com

Gaurav Gautam, Anita Mohan

Department of Physics,
I.I.T (BHU) Varanasi,
Varanasi 221005, India

Rakesh Kumar Gautam

Department of Mechanical Engineering,
I.I.T (BHU) Varanasi,
Varanasi 221005, India

Sunil Mohan

Department of Metallurgical Engineering,
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 139(1), 011002 (Oct 06, 2016) (8 pages) Paper No: MATS-15-1222; doi: 10.1115/1.4034692 History: Received September 09, 2015; Revised August 27, 2016

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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Fig. 1

XRD pattern of (a) composites and (b) extracted ZrB2 particles

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Fig. 2

Optical micrographs of (a) AA5052–0 vol. % ZrB2, (b) AA5052–4.5 vol. % ZrB2, and (c) AA5052–9 vol. % ZrB2 composite

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Fig. 3

Grain size distribution curve of (a) AA5052–0 vol. % ZrB2, (b) AA5052–4.5 vol. % ZrB2, and (c) AA5052–9 vol. % ZrB2 composite

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Fig. 4

SEM micrographs of (a) AA5052–4.5 vol. % ZrB2, (b) AA5052–4.5 vol. % ZrB2, (c)morphology of ZrB2, and (d) EDS spectrum of ZrB2 particle

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Fig. 5

Particle size distribution curve of ZrB2 particles

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Fig. 6

TEM micrograph showing dislocations present around ZrB2 particles

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Fig. 7

Engineering stress–strain diagram of composites

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Fig. 8

Tensile fractured surface of (a) AA5052–0 vol. % ZrB2, (b) AA5052–4.5 vol. % ZrB2, and (c) AA5052–9 vol. % ZrB2 composite



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