Effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloy
In this study, tensile and creep deformation of a high-entropy alloy processed by selective laser melting (SLM) has been investigated; hot ductility drop was identified at first, and the loss of ductility at elevated temperature was associated with intergranular fracture. By modifying the grain boun...
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Taylor & Francis Group
2023-12-01
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| Series: | Science and Technology of Advanced Materials |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/14686996.2022.2158043 |
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| author | Jhuo-Lun Lee Pei-Te Wang Kai-Chi Lo Pai-Keng Shen Nien-Ti Tsou Koji Kakehi Hideyuki Murakami Che-Wei Tsai Stéphane Gorsse An-Chou Yeh |
| author_facet | Jhuo-Lun Lee Pei-Te Wang Kai-Chi Lo Pai-Keng Shen Nien-Ti Tsou Koji Kakehi Hideyuki Murakami Che-Wei Tsai Stéphane Gorsse An-Chou Yeh |
| author_sort | Jhuo-Lun Lee |
| collection | DOAJ |
| description | In this study, tensile and creep deformation of a high-entropy alloy processed by selective laser melting (SLM) has been investigated; hot ductility drop was identified at first, and the loss of ductility at elevated temperature was associated with intergranular fracture. By modifying the grain boundary morphology from straight to serration, the hot ductility drop issue has been resolved successfully. The serrated grain boundary could be achieved by reducing the cooling rate of solution heat treatment, which allowed the coarsening of L12 structured γ′ precipitates to interfere with mobile grain boundaries, resulting in undulation of the grain boundary morphology. Tensile and creep tests at 650°C were conducted, and serrated grain boundary could render a significant increase in tensile fracture strain and creep rupture life by a factor of 3.5 and 400, respectively. Detailed microstructure analysis has indicated that serrated grain boundary could distribute strains more evenly than that of straight morphology. The underlying mechanism of deformation with grain boundary serration was further demonstrated by molecular dynamic simulation, which has indicated that serrated grain boundaries could reduce local strain concentration and provide resistance against intergranular cracking. This is the first study to tackle the hot ductility drop issue in a high-entropy alloy fabricated by SLM; it can provide a guideline to develop future high-entropy alloys and design post heat treatment for elevated temperature applications. |
| format | Article |
| id | doaj-art-a6b25c0b87cb479bb736cc20f4cb88d5 |
| institution | Kabale University |
| issn | 1468-6996 1878-5514 |
| language | English |
| publishDate | 2023-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Science and Technology of Advanced Materials |
| spelling | doaj-art-a6b25c0b87cb479bb736cc20f4cb88d52025-08-20T03:40:17ZengTaylor & Francis GroupScience and Technology of Advanced Materials1468-69961878-55142023-12-0124110.1080/14686996.2022.2158043Effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloyJhuo-Lun Lee0Pei-Te Wang1Kai-Chi Lo2Pai-Keng Shen3Nien-Ti Tsou4Koji Kakehi5Hideyuki Murakami6Che-Wei Tsai7Stéphane Gorsse8An-Chou Yeh9High Entropy Materials Center, National Tsing Hua University, Hsinchu, Taiwan (ROC)Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan (ROC)High Entropy Materials Center, National Tsing Hua University, Hsinchu, Taiwan (ROC)Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan (ROC)Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan (ROC)Department of Mechanical Engineering, Tokyo Metropolitan University, Hachiojishi, Tokyo, JapanResearch Center for Structural Materials, National Institute for Materials Science, Tsukuba, JapanHigh Entropy Materials Center, National Tsing Hua University, Hsinchu, Taiwan (ROC)CNRS, University of Bordeaux, Bordeaux INP, ICMCB, UMR 5026, Pessac, FranceHigh Entropy Materials Center, National Tsing Hua University, Hsinchu, Taiwan (ROC)In this study, tensile and creep deformation of a high-entropy alloy processed by selective laser melting (SLM) has been investigated; hot ductility drop was identified at first, and the loss of ductility at elevated temperature was associated with intergranular fracture. By modifying the grain boundary morphology from straight to serration, the hot ductility drop issue has been resolved successfully. The serrated grain boundary could be achieved by reducing the cooling rate of solution heat treatment, which allowed the coarsening of L12 structured γ′ precipitates to interfere with mobile grain boundaries, resulting in undulation of the grain boundary morphology. Tensile and creep tests at 650°C were conducted, and serrated grain boundary could render a significant increase in tensile fracture strain and creep rupture life by a factor of 3.5 and 400, respectively. Detailed microstructure analysis has indicated that serrated grain boundary could distribute strains more evenly than that of straight morphology. The underlying mechanism of deformation with grain boundary serration was further demonstrated by molecular dynamic simulation, which has indicated that serrated grain boundaries could reduce local strain concentration and provide resistance against intergranular cracking. This is the first study to tackle the hot ductility drop issue in a high-entropy alloy fabricated by SLM; it can provide a guideline to develop future high-entropy alloys and design post heat treatment for elevated temperature applications.https://www.tandfonline.com/doi/10.1080/14686996.2022.2158043Selective laser meltinghigh-entropy alloyshot ductility dropstensile creep propertiesserrated grain boundary |
| spellingShingle | Jhuo-Lun Lee Pei-Te Wang Kai-Chi Lo Pai-Keng Shen Nien-Ti Tsou Koji Kakehi Hideyuki Murakami Che-Wei Tsai Stéphane Gorsse An-Chou Yeh Effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloy Science and Technology of Advanced Materials Selective laser melting high-entropy alloys hot ductility drops tensile creep properties serrated grain boundary |
| title | Effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloy |
| title_full | Effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloy |
| title_fullStr | Effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloy |
| title_full_unstemmed | Effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloy |
| title_short | Effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloy |
| title_sort | effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloy |
| topic | Selective laser melting high-entropy alloys hot ductility drops tensile creep properties serrated grain boundary |
| url | https://www.tandfonline.com/doi/10.1080/14686996.2022.2158043 |
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