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Development of in-Situ Al-Si/CuAl(2) Metal Matrix Composites: Microstructure, Hardness, and Wear Behavior
In the present work, in-situ metal matrix composites were fabricated through squeeze casting. The copper particles were dispersed with different weight percentages (3%, 6%, 10%, and 15%) into Al-12% Si piston alloy. Also, heat treatments were performed at 380 °C and 450 °C for holding times of 6 and...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5456778/ https://www.ncbi.nlm.nih.gov/pubmed/28773564 http://dx.doi.org/10.3390/ma9060442 |
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author | Tash, Mahmoud M. Mahmoud, Essam R. I. |
author_facet | Tash, Mahmoud M. Mahmoud, Essam R. I. |
author_sort | Tash, Mahmoud M. |
collection | PubMed |
description | In the present work, in-situ metal matrix composites were fabricated through squeeze casting. The copper particles were dispersed with different weight percentages (3%, 6%, 10%, and 15%) into Al-12% Si piston alloy. Also, heat treatments were performed at 380 °C and 450 °C for holding times of 6 and 18 h. The microstructures, X-ray diffractometer (XRD) pattern, hardness, and wear characteristics were evaluated. The results showed that these copper particles have reacted with the aluminum under all of the aforementioned processing conditions resulting in the formation of fine copper aluminide intermetallics. Most of the intermetallics were CuAl(2), while AlCu appeared in a small ratio. Additionally, these intermetallics were homogenously distributed within the alloy matrix with up to 6% Cu addition. The amounts of those intermetallics increased after performing heat treatment. Most of these intermetallics were CuAl(2) at 380 °C, while the Cu-rich intermetallics appeared at 450 °C. Increasing the holding time to 18 h, however, led to grain coarsening and resulted in the formation of some cracks. The hardness of the resulting composite materials was improved. The hardness value reached to about 170 HV after heat treating at 380 °C for 8 h. The wear resistance of the resulting composite materials was remarkably improved, especially at lower additions of Cu and at the lower heat treatment temperature. |
format | Online Article Text |
id | pubmed-5456778 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-54567782017-07-28 Development of in-Situ Al-Si/CuAl(2) Metal Matrix Composites: Microstructure, Hardness, and Wear Behavior Tash, Mahmoud M. Mahmoud, Essam R. I. Materials (Basel) Article In the present work, in-situ metal matrix composites were fabricated through squeeze casting. The copper particles were dispersed with different weight percentages (3%, 6%, 10%, and 15%) into Al-12% Si piston alloy. Also, heat treatments were performed at 380 °C and 450 °C for holding times of 6 and 18 h. The microstructures, X-ray diffractometer (XRD) pattern, hardness, and wear characteristics were evaluated. The results showed that these copper particles have reacted with the aluminum under all of the aforementioned processing conditions resulting in the formation of fine copper aluminide intermetallics. Most of the intermetallics were CuAl(2), while AlCu appeared in a small ratio. Additionally, these intermetallics were homogenously distributed within the alloy matrix with up to 6% Cu addition. The amounts of those intermetallics increased after performing heat treatment. Most of these intermetallics were CuAl(2) at 380 °C, while the Cu-rich intermetallics appeared at 450 °C. Increasing the holding time to 18 h, however, led to grain coarsening and resulted in the formation of some cracks. The hardness of the resulting composite materials was improved. The hardness value reached to about 170 HV after heat treating at 380 °C for 8 h. The wear resistance of the resulting composite materials was remarkably improved, especially at lower additions of Cu and at the lower heat treatment temperature. MDPI 2016-06-02 /pmc/articles/PMC5456778/ /pubmed/28773564 http://dx.doi.org/10.3390/ma9060442 Text en © 2016 by the authors; Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Tash, Mahmoud M. Mahmoud, Essam R. I. Development of in-Situ Al-Si/CuAl(2) Metal Matrix Composites: Microstructure, Hardness, and Wear Behavior |
title | Development of in-Situ Al-Si/CuAl(2) Metal Matrix Composites: Microstructure, Hardness, and Wear Behavior |
title_full | Development of in-Situ Al-Si/CuAl(2) Metal Matrix Composites: Microstructure, Hardness, and Wear Behavior |
title_fullStr | Development of in-Situ Al-Si/CuAl(2) Metal Matrix Composites: Microstructure, Hardness, and Wear Behavior |
title_full_unstemmed | Development of in-Situ Al-Si/CuAl(2) Metal Matrix Composites: Microstructure, Hardness, and Wear Behavior |
title_short | Development of in-Situ Al-Si/CuAl(2) Metal Matrix Composites: Microstructure, Hardness, and Wear Behavior |
title_sort | development of in-situ al-si/cual(2) metal matrix composites: microstructure, hardness, and wear behavior |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5456778/ https://www.ncbi.nlm.nih.gov/pubmed/28773564 http://dx.doi.org/10.3390/ma9060442 |
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