Research on the Microstructure and Mechanical Properties of Cr<sub>2</sub>O<sub>3</sub>/Cu Composites Prepared by Internal Oxidation and HP Method
In this study, an innovative internal oxidation-powder metallurgy combined process was employed to controllably generate nano-sized Cr<sub>2</sub>O<sub>3</sub> reinforcing phases within the Cu matrix. The Cu/Cr<sub>2</sub>O<sub>3</sub> composites were...
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MDPI AG
2025-05-01
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| Online Access: | https://www.mdpi.com/2075-4701/15/6/585 |
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| author | Qinguo Zhou Haijun Wu Qi Zhao Yichun Liu |
| author_facet | Qinguo Zhou Haijun Wu Qi Zhao Yichun Liu |
| author_sort | Qinguo Zhou |
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| description | In this study, an innovative internal oxidation-powder metallurgy combined process was employed to controllably generate nano-sized Cr<sub>2</sub>O<sub>3</sub> reinforcing phases within the Cu matrix. The Cu/Cr<sub>2</sub>O<sub>3</sub> composites were successfully fabricated using the hot-press sintering (HP) method, and a systematic comparison was made between the microstructure and mechanical properties of composites prepared by internal oxidation and external addition methods. The results show that internal oxidation primarily occurs during the sintering process rather than ball milling. Compared with external addition, the internal oxidation method effectively prevents particle aggregation and achieves a uniform distribution of Cr<sub>2</sub>O<sub>3</sub> particles in the Cu matrix. When the Cr content reaches 5 wt%, the Cu-5%Cr composite exhibits optimal mechanical properties, with a yield strength of 282.7 MPa and ultimate tensile strength of 355 MPa, representing increases of 43% and 34% over pure copper, respectively, while maintaining an elongation of 12.6%. The Cr<sub>2</sub>O<sub>3</sub> particles generated via internal oxidation enhance their strength through Orowan strengthening and dislocation pinning, thereby significantly improving mechanical performance without compromising plasticity. This research provides a novel process optimization approach for developing high-performance dispersion-strengthened copper matrix composites. |
| format | Article |
| id | doaj-art-b3524331376d4671adca299df5a94941 |
| institution | Kabale University |
| issn | 2075-4701 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj-art-b3524331376d4671adca299df5a949412025-08-20T03:27:32ZengMDPI AGMetals2075-47012025-05-0115658510.3390/met15060585Research on the Microstructure and Mechanical Properties of Cr<sub>2</sub>O<sub>3</sub>/Cu Composites Prepared by Internal Oxidation and HP MethodQinguo Zhou0Haijun Wu1Qi Zhao2Yichun Liu3School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaKunming Precious Materials & Technology Co., Ltd., Kunming 650106, ChinaKunming Precious Materials & Technology Co., Ltd., Kunming 650106, ChinaSchool of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaIn this study, an innovative internal oxidation-powder metallurgy combined process was employed to controllably generate nano-sized Cr<sub>2</sub>O<sub>3</sub> reinforcing phases within the Cu matrix. The Cu/Cr<sub>2</sub>O<sub>3</sub> composites were successfully fabricated using the hot-press sintering (HP) method, and a systematic comparison was made between the microstructure and mechanical properties of composites prepared by internal oxidation and external addition methods. The results show that internal oxidation primarily occurs during the sintering process rather than ball milling. Compared with external addition, the internal oxidation method effectively prevents particle aggregation and achieves a uniform distribution of Cr<sub>2</sub>O<sub>3</sub> particles in the Cu matrix. When the Cr content reaches 5 wt%, the Cu-5%Cr composite exhibits optimal mechanical properties, with a yield strength of 282.7 MPa and ultimate tensile strength of 355 MPa, representing increases of 43% and 34% over pure copper, respectively, while maintaining an elongation of 12.6%. The Cr<sub>2</sub>O<sub>3</sub> particles generated via internal oxidation enhance their strength through Orowan strengthening and dislocation pinning, thereby significantly improving mechanical performance without compromising plasticity. This research provides a novel process optimization approach for developing high-performance dispersion-strengthened copper matrix composites.https://www.mdpi.com/2075-4701/15/6/585Cu matrix compositeinternal oxidation methodmicrostructuremechanical properties |
| spellingShingle | Qinguo Zhou Haijun Wu Qi Zhao Yichun Liu Research on the Microstructure and Mechanical Properties of Cr<sub>2</sub>O<sub>3</sub>/Cu Composites Prepared by Internal Oxidation and HP Method Metals Cu matrix composite internal oxidation method microstructure mechanical properties |
| title | Research on the Microstructure and Mechanical Properties of Cr<sub>2</sub>O<sub>3</sub>/Cu Composites Prepared by Internal Oxidation and HP Method |
| title_full | Research on the Microstructure and Mechanical Properties of Cr<sub>2</sub>O<sub>3</sub>/Cu Composites Prepared by Internal Oxidation and HP Method |
| title_fullStr | Research on the Microstructure and Mechanical Properties of Cr<sub>2</sub>O<sub>3</sub>/Cu Composites Prepared by Internal Oxidation and HP Method |
| title_full_unstemmed | Research on the Microstructure and Mechanical Properties of Cr<sub>2</sub>O<sub>3</sub>/Cu Composites Prepared by Internal Oxidation and HP Method |
| title_short | Research on the Microstructure and Mechanical Properties of Cr<sub>2</sub>O<sub>3</sub>/Cu Composites Prepared by Internal Oxidation and HP Method |
| title_sort | research on the microstructure and mechanical properties of cr sub 2 sub o sub 3 sub cu composites prepared by internal oxidation and hp method |
| topic | Cu matrix composite internal oxidation method microstructure mechanical properties |
| url | https://www.mdpi.com/2075-4701/15/6/585 |
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