Strengthening mechanism and low-temperature hardening behavior of high-entropy alloy/graphene composite
High-entropy alloy/graphene composites (HEA/Gr) have shown significant potential in various applications due to their exceptional mechanical properties, particularly their high strength. However, a comprehensive understanding of their strengthening mechanisms is still lacking, which hinders the desi...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-03-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525000966 |
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| author | Shaocong Zhou Yongchao Liang Yuanwei Pu Yu Zhou Lili Zhou Qian Chen Zean Tian Tinghong Gao |
| author_facet | Shaocong Zhou Yongchao Liang Yuanwei Pu Yu Zhou Lili Zhou Qian Chen Zean Tian Tinghong Gao |
| author_sort | Shaocong Zhou |
| collection | DOAJ |
| description | High-entropy alloy/graphene composites (HEA/Gr) have shown significant potential in various applications due to their exceptional mechanical properties, particularly their high strength. However, a comprehensive understanding of their strengthening mechanisms is still lacking, which hinders the design of their structures and optimization of their performance. This study systematically investigates the tensile behavior of the equiatomic CoCrFeMnNi HEA and HEA/Gr composite using molecular dynamics simulations, focusing on the microscopic strengthening mechanisms of the reinforcing phase and the low-temperature hardening behavior of the HEA/Gr composite. The results show that the yield strength and elastic modulus of the composite increased by 57.5 % and 19 %, respectively, compared to the HEA. The graphene interface effectively hinders dislocation propagation and enhances dislocation interactions, playing a crucial role in stress transfer and resulting in distinct stress and strain distributions within the matrix. Moreover, the low-temperature hardening mechanisms of the composite were explored. The study reveals that local BCC atomic clusters formed by FCC-BCC phase transition accelerate dislocation nucleation. The compatibility between the FCC and BCC lattice structures facilitates dislocation slip and promotes the interaction of intrinsic stacking faults (ISFs), leading to local stress concentration and increased dislocation entanglement. |
| format | Article |
| id | doaj-art-163bcf42cd2d4449ae5405456f500ce1 |
| institution | DOAJ |
| issn | 0264-1275 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj-art-163bcf42cd2d4449ae5405456f500ce12025-08-20T02:55:16ZengElsevierMaterials & Design0264-12752025-03-0125111367610.1016/j.matdes.2025.113676Strengthening mechanism and low-temperature hardening behavior of high-entropy alloy/graphene compositeShaocong Zhou0Yongchao Liang1Yuanwei Pu2Yu Zhou3Lili Zhou4Qian Chen5Zean Tian6Tinghong Gao7Institute of Advanced Optoelectronic Materials and Technology, College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, ChinaInstitute of Advanced Optoelectronic Materials and Technology, College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, China; Corresponding author.Institute of Advanced Optoelectronic Materials and Technology, College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, ChinaInstitute of Advanced Optoelectronic Materials and Technology, College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, ChinaDepartment of Information Engineering, Gannan Medical University, Ganzhou 341000, ChinaInstitute of Advanced Optoelectronic Materials and Technology, College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, ChinaInstitute of Advanced Optoelectronic Materials and Technology, College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, China; College of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, ChinaInstitute of Advanced Optoelectronic Materials and Technology, College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, ChinaHigh-entropy alloy/graphene composites (HEA/Gr) have shown significant potential in various applications due to their exceptional mechanical properties, particularly their high strength. However, a comprehensive understanding of their strengthening mechanisms is still lacking, which hinders the design of their structures and optimization of their performance. This study systematically investigates the tensile behavior of the equiatomic CoCrFeMnNi HEA and HEA/Gr composite using molecular dynamics simulations, focusing on the microscopic strengthening mechanisms of the reinforcing phase and the low-temperature hardening behavior of the HEA/Gr composite. The results show that the yield strength and elastic modulus of the composite increased by 57.5 % and 19 %, respectively, compared to the HEA. The graphene interface effectively hinders dislocation propagation and enhances dislocation interactions, playing a crucial role in stress transfer and resulting in distinct stress and strain distributions within the matrix. Moreover, the low-temperature hardening mechanisms of the composite were explored. The study reveals that local BCC atomic clusters formed by FCC-BCC phase transition accelerate dislocation nucleation. The compatibility between the FCC and BCC lattice structures facilitates dislocation slip and promotes the interaction of intrinsic stacking faults (ISFs), leading to local stress concentration and increased dislocation entanglement.http://www.sciencedirect.com/science/article/pii/S0264127525000966High-entropy alloysGrapheneMechanical propertiesHardening |
| spellingShingle | Shaocong Zhou Yongchao Liang Yuanwei Pu Yu Zhou Lili Zhou Qian Chen Zean Tian Tinghong Gao Strengthening mechanism and low-temperature hardening behavior of high-entropy alloy/graphene composite Materials & Design High-entropy alloys Graphene Mechanical properties Hardening |
| title | Strengthening mechanism and low-temperature hardening behavior of high-entropy alloy/graphene composite |
| title_full | Strengthening mechanism and low-temperature hardening behavior of high-entropy alloy/graphene composite |
| title_fullStr | Strengthening mechanism and low-temperature hardening behavior of high-entropy alloy/graphene composite |
| title_full_unstemmed | Strengthening mechanism and low-temperature hardening behavior of high-entropy alloy/graphene composite |
| title_short | Strengthening mechanism and low-temperature hardening behavior of high-entropy alloy/graphene composite |
| title_sort | strengthening mechanism and low temperature hardening behavior of high entropy alloy graphene composite |
| topic | High-entropy alloys Graphene Mechanical properties Hardening |
| url | http://www.sciencedirect.com/science/article/pii/S0264127525000966 |
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