Effect of Gd addition on phase formation, microstructure, and mechanical performance of a CoCrFeNi multi-principal element alloy
Here, two multi-principal element alloys (MEPAs): CoCrFeNi and CoCrFeNiGd0.05 are fabricated by high-energy ball milling and spark plasma sintering. The effect of Gd on microstructure and mechanical properties of the CoCrFeNi MPEA is investigated. The addition of Gd to the CoCrFeNi base alloy leads...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127523007803 |
| _version_ | 1797526266673364992 |
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| author | Yan Long Wenxing Meng Florian Vogel Guiqi Li Lijing Zhang |
| author_facet | Yan Long Wenxing Meng Florian Vogel Guiqi Li Lijing Zhang |
| author_sort | Yan Long |
| collection | DOAJ |
| description | Here, two multi-principal element alloys (MEPAs): CoCrFeNi and CoCrFeNiGd0.05 are fabricated by high-energy ball milling and spark plasma sintering. The effect of Gd on microstructure and mechanical properties of the CoCrFeNi MPEA is investigated. The addition of Gd to the CoCrFeNi base alloy leads to precipitation of a GdNi5-type phase with hexagonal structure (HS) and minor amounts of a Gd-rich oxide phase from the FCC matrix. Compared to the CoCrFeNi base alloy, the grain size of CoCrFeNiGd0.05 is smaller, and the tensile yield strength of CoCrFeNiGd0.05 significantly increases from 546 MPa to 859 MPa, along with minor sacrifices in plasticity where the elongation only slightly decreases from 20.8% to 19.4%. The enhanced strength of Gd-containing MPEA is mainly attributed to grain boundary strengthening from the ultrafine-grained microstructure and the precipitation strengthening contributed by the HS phase. Transmission electron microscopy (TEM) results demonstrate that the GdNi5-type intermetallic phase is coherent with the FCC matrix and shows the following orientation relationship: {111¯}FCC//{2¯119¯}HS. The high plasticity of the composite-structured CoCrFeNiGd0.05 alloy is attributed to the homogenous distribution of the ultrafine HS phase and the coherent HS-FCC interface facilitating dislocation slipping. |
| first_indexed | 2024-03-10T09:27:46Z |
| format | Article |
| id | doaj.art-a00b286f65ed47bcbfa7155bcea47e56 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-03-10T09:27:46Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-a00b286f65ed47bcbfa7155bcea47e562023-11-22T04:46:15ZengElsevierMaterials & Design0264-12752023-11-01235112365Effect of Gd addition on phase formation, microstructure, and mechanical performance of a CoCrFeNi multi-principal element alloyYan Long0Wenxing Meng1Florian Vogel2Guiqi Li3Lijing Zhang4Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials, Guangzhou 510640, PR China; School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, PR ChinaGuangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials, Guangzhou 510640, PR China; School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, PR ChinaAdvanced Research Center for Precision Instruments, Hainan University, Haikou 570028, PR China; Corresponding author.School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, PR ChinaSchool of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, PR ChinaHere, two multi-principal element alloys (MEPAs): CoCrFeNi and CoCrFeNiGd0.05 are fabricated by high-energy ball milling and spark plasma sintering. The effect of Gd on microstructure and mechanical properties of the CoCrFeNi MPEA is investigated. The addition of Gd to the CoCrFeNi base alloy leads to precipitation of a GdNi5-type phase with hexagonal structure (HS) and minor amounts of a Gd-rich oxide phase from the FCC matrix. Compared to the CoCrFeNi base alloy, the grain size of CoCrFeNiGd0.05 is smaller, and the tensile yield strength of CoCrFeNiGd0.05 significantly increases from 546 MPa to 859 MPa, along with minor sacrifices in plasticity where the elongation only slightly decreases from 20.8% to 19.4%. The enhanced strength of Gd-containing MPEA is mainly attributed to grain boundary strengthening from the ultrafine-grained microstructure and the precipitation strengthening contributed by the HS phase. Transmission electron microscopy (TEM) results demonstrate that the GdNi5-type intermetallic phase is coherent with the FCC matrix and shows the following orientation relationship: {111¯}FCC//{2¯119¯}HS. The high plasticity of the composite-structured CoCrFeNiGd0.05 alloy is attributed to the homogenous distribution of the ultrafine HS phase and the coherent HS-FCC interface facilitating dislocation slipping.http://www.sciencedirect.com/science/article/pii/S0264127523007803Multi-principal element alloyRare-earth elementMicrostructureMechanical propertiesIntermetallics |
| spellingShingle | Yan Long Wenxing Meng Florian Vogel Guiqi Li Lijing Zhang Effect of Gd addition on phase formation, microstructure, and mechanical performance of a CoCrFeNi multi-principal element alloy Materials & Design Multi-principal element alloy Rare-earth element Microstructure Mechanical properties Intermetallics |
| title | Effect of Gd addition on phase formation, microstructure, and mechanical performance of a CoCrFeNi multi-principal element alloy |
| title_full | Effect of Gd addition on phase formation, microstructure, and mechanical performance of a CoCrFeNi multi-principal element alloy |
| title_fullStr | Effect of Gd addition on phase formation, microstructure, and mechanical performance of a CoCrFeNi multi-principal element alloy |
| title_full_unstemmed | Effect of Gd addition on phase formation, microstructure, and mechanical performance of a CoCrFeNi multi-principal element alloy |
| title_short | Effect of Gd addition on phase formation, microstructure, and mechanical performance of a CoCrFeNi multi-principal element alloy |
| title_sort | effect of gd addition on phase formation microstructure and mechanical performance of a cocrfeni multi principal element alloy |
| topic | Multi-principal element alloy Rare-earth element Microstructure Mechanical properties Intermetallics |
| url | http://www.sciencedirect.com/science/article/pii/S0264127523007803 |
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