Effects of Cr Addition on the Precipitation and Properties of Cryo-Rolled CuNiSi Alloys
CuNiSi alloys are widely used for lead frames and connectors due to the combination of high strength and high electrical conductivity. In this work, the microstructures, properties and precipitation behaviors of cryo-rolled CuNiSi alloys with different Cr additions were investigated. The results sho...
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| Format: | Article |
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MDPI AG
2023-04-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/4/758 |
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| author | Wei Wang Zongning Chen Enyu Guo Siruo Zhang Huijun Kang Tongmin Wang |
| author_facet | Wei Wang Zongning Chen Enyu Guo Siruo Zhang Huijun Kang Tongmin Wang |
| author_sort | Wei Wang |
| collection | DOAJ |
| description | CuNiSi alloys are widely used for lead frames and connectors due to the combination of high strength and high electrical conductivity. In this work, the microstructures, properties and precipitation behaviors of cryo-rolled CuNiSi alloys with different Cr additions were investigated. The results show that the microstructures of cryo-rolled CuNiSi alloys are mainly composed of nano-sized deformation twins. During aging, discontinuous precipitation gradually takes the place of continuous precipitation with the onset of recrystallization. The addition of chromium reacts to form Cr<sub>3</sub>Si particles and facilitates the formation of lamellar structures in the cryo-rolled states of CuNiSi alloys. Moreover, both the recrystallization and the discontinuous precipitation of cryo-rolled CuNiSi alloys are hindered by the addition of Cr elements. As a result, the mechanical strength of cryo-rolled CuNiSi alloys after aging can be maintained. The best combination of properties obtained in the CuNiSi-0.15Cr alloy is 761 MPa, 6.1% and 48.4% IACS in ultimate strength, elongation and electrical conductivity, respectively. |
| first_indexed | 2024-03-11T04:44:37Z |
| format | Article |
| id | doaj.art-6babdd15b95a4de1970462d0bdf42b75 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T04:44:37Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-6babdd15b95a4de1970462d0bdf42b752023-11-17T20:27:17ZengMDPI AGMetals2075-47012023-04-0113475810.3390/met13040758Effects of Cr Addition on the Precipitation and Properties of Cryo-Rolled CuNiSi AlloysWei Wang0Zongning Chen1Enyu Guo2Siruo Zhang3Huijun Kang4Tongmin Wang5AVIC Manufacturing Technology Institute, Beijing 100024, ChinaKey Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaSchool of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, ChinaKey Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaCuNiSi alloys are widely used for lead frames and connectors due to the combination of high strength and high electrical conductivity. In this work, the microstructures, properties and precipitation behaviors of cryo-rolled CuNiSi alloys with different Cr additions were investigated. The results show that the microstructures of cryo-rolled CuNiSi alloys are mainly composed of nano-sized deformation twins. During aging, discontinuous precipitation gradually takes the place of continuous precipitation with the onset of recrystallization. The addition of chromium reacts to form Cr<sub>3</sub>Si particles and facilitates the formation of lamellar structures in the cryo-rolled states of CuNiSi alloys. Moreover, both the recrystallization and the discontinuous precipitation of cryo-rolled CuNiSi alloys are hindered by the addition of Cr elements. As a result, the mechanical strength of cryo-rolled CuNiSi alloys after aging can be maintained. The best combination of properties obtained in the CuNiSi-0.15Cr alloy is 761 MPa, 6.1% and 48.4% IACS in ultimate strength, elongation and electrical conductivity, respectively.https://www.mdpi.com/2075-4701/13/4/758CuNiSi alloysalloyingcryo-rollingprecipitationelectrical conductivity |
| spellingShingle | Wei Wang Zongning Chen Enyu Guo Siruo Zhang Huijun Kang Tongmin Wang Effects of Cr Addition on the Precipitation and Properties of Cryo-Rolled CuNiSi Alloys Metals CuNiSi alloys alloying cryo-rolling precipitation electrical conductivity |
| title | Effects of Cr Addition on the Precipitation and Properties of Cryo-Rolled CuNiSi Alloys |
| title_full | Effects of Cr Addition on the Precipitation and Properties of Cryo-Rolled CuNiSi Alloys |
| title_fullStr | Effects of Cr Addition on the Precipitation and Properties of Cryo-Rolled CuNiSi Alloys |
| title_full_unstemmed | Effects of Cr Addition on the Precipitation and Properties of Cryo-Rolled CuNiSi Alloys |
| title_short | Effects of Cr Addition on the Precipitation and Properties of Cryo-Rolled CuNiSi Alloys |
| title_sort | effects of cr addition on the precipitation and properties of cryo rolled cunisi alloys |
| topic | CuNiSi alloys alloying cryo-rolling precipitation electrical conductivity |
| url | https://www.mdpi.com/2075-4701/13/4/758 |
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