Microstructure and Compressive Behavior of Al–Y<sub>2</sub>O<sub>3</sub> Nanocomposites Prepared by Microwave-Assisted Mechanical Alloying
<p dir="ltr">In this study, Al–Y<sub>2</sub>O<sub>3</sub> nanocomposites were synthesized via mechanical alloying and microwave-assisted sintering. The effect of different levels of yttrium oxide on the microstructural and mechanical properties of the Al–Y<...
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2019
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| Summary: | <p dir="ltr">In this study, Al–Y<sub>2</sub>O<sub>3</sub> nanocomposites were synthesized via mechanical alloying and microwave-assisted sintering. The effect of different levels of yttrium oxide on the microstructural and mechanical properties of the Al–Y<sub>2</sub>O<sub>3</sub> nanocomposites were investigated. The density of the Al–Y<sub>2</sub>O<sub>3</sub> nanocomposites increased with increasing Y<sub>2</sub>O<sub>3</sub> volume fraction in the aluminum matrix, while the porosity decreased. Scanning electron microscopy analysis of the nanocomposites showed the homogeneous distribution of the Y<sub>2</sub>O<sub>3</sub> nanoparticles in the aluminum matrix. X-ray diffraction analysis revealed the presence of yttria particles in the Al matrix. The mechanical properties of the Al–Y<sub>2</sub>O<sub>3</sub> nanocomposites increased as the addition of yttria reached to 1.5 vol. % and thereafter decreased. The microhardness first increased from 38 Hv to 81 Hv, and then decreased to 74 ± 4 Hv for 1.5 vol. % yttria. The Al–1.5 vol. % Y<sub>2</sub>O<sub>3</sub> nanocomposite exhibited the best ultimate compressive strength and yielded a strength of 359 ± 7 and 111 ± 5 MPa, respectively. The Al–Y<sub>2</sub>O<sub>3</sub> nanocomposites showed higher hardness, yield strength, and compressive strength than the microwave-assisted mechanically alloyed pure Al.</p><p dir="ltr"><br></p><h2>Other Information</h2><p dir="ltr">Published in: Metals<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.3390/met9040414" target="_blank">https://dx.doi.org/10.3390/met9040414</a></p> |
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