Mechanical characterization of Mg−B<sub>4</sub>C nanocomposite fabricated at different strain rates

Gholam Hossein Majzoobi; Kaveh Rahmani

doi:10.1007/s12613-019-1902-x

Volume 27 Issue 2

Feb. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(2): 252-263

Gholam Hossein Majzoobi and Kaveh Rahmani, Mechanical characterization of Mg−B₄C nanocomposite fabricated at different strain rates, Int. J. Miner. Metall. Mater., 27(2020), No. 2, pp. 252-263. https://doi.org/10.1007/s12613-019-1902-x

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Gholam Hossein Majzoobi and Kaveh Rahmani, Mechanical characterization of Mg−B4C nanocomposite fabricated at different strain rates, Int. J. Miner. Metall. Mater., 27(2020), No. 2, pp. 252-263. https://doi.org/10.1007/s12613-019-1902-x

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Research Article

Mechanical characterization of Mg−B₄C nanocomposite fabricated at different strain rates

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Corresponding author:
Gholam Hossein Majzoobi E-mail: gh_majzoobi@yahoo.co.uk;gh_majzoobi@basu.ac.ir
Received: 5 July 2019; Revised: 21 September 2019; Accepted: 24 September 2019; Available online: 15 January 2020

Abstract

Abstract

Magnesium has wide application in industry. The main purpose of this investigation was to improve the properties of magnesium by reinforcing it using B₄C nanoparticles. The reinforced nanocomposites were fabricated using a powder compaction technique for 0, 1.5vol%, 3vol%, 5vol%, and 10vol% of B₄C. Powder compaction was conducted using a split Hopkinson bar (SHB), drop hammer (DH), and Instron to reach different compaction loading rates. The compressive stress–strain curves of the samples were captured from quasi-static and dynamic tests carried out using an Instron and split Hopkinson pressure bar, respectively. Results revealed that, to achieve the highest improvement in ultimate strength, the contents of B₄C were 1.5vol%, 3vol%, and 3vol% for Instron, DH, and SHB, respectively. These results also indicated that the effect of compaction type on the quasi-static strength of the samples was not as significant, although its effect on the dynamic strength of the samples was remarkable. The improvement in ultimate strength obtained from the quasi-static stress–strain curves of the samples (compared to pure Mg) varied from 9.9% for DH to 24% for SHB. The dynamic strength of the samples was improved (with respect to pure Mg) by 73%, 116%, and 141% for the specimens compacted by Instron, DH, and SHB, respectively. The improvement in strength was believed to be due to strengthening mechanisms, friction, adiabatic heating, and shock waves.
- powder compaction;
- B₄C;
- magnesium;
- strain rate;
- ultimate strength;
- sintering

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