Effect of high-temperature heat treatment on mechanical properties and microstructure of CoCrNi medium-entropy alloy formed by laser powder bed fusion
Laser additive manufacturing (LAM) of high/medium-entropy alloys (H/MEA) possesses considerable industrial promise. In this study, laser powder bed fusion (L-PBF) was employed to fabricate a CoCrNi MEA with excellent strength-ductility synergy. The investigation delves into the microstructural evolu...
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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424030655 |
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| author | Laixia Yang Mengjia Yang Yanze Zhang Qidong Xie Longbo Zhang Zhen Chen Hang Su |
| author_facet | Laixia Yang Mengjia Yang Yanze Zhang Qidong Xie Longbo Zhang Zhen Chen Hang Su |
| author_sort | Laixia Yang |
| collection | DOAJ |
| description | Laser additive manufacturing (LAM) of high/medium-entropy alloys (H/MEA) possesses considerable industrial promise. In this study, laser powder bed fusion (L-PBF) was employed to fabricate a CoCrNi MEA with excellent strength-ductility synergy. The investigation delves into the microstructural evolution, mechanical properties, and the influence of microstructure on mechanical performance after annealing at 1200 °C for 1, 2, and 4 h. This research addresses deficiencies in traditional processes and native laser additive manufacturing of CoCrNi. Testing and analysis reveal a notable increase in elongation after high-temperature annealing, accompanied by a trend towards equiaxed grain morphology with increasing fractions of recrystallization and annealing twin boundaries, and a gradual reduction in geometric dislocation density. Alterations in grain morphology, dislocation density, fractions of recrystallization, and grain boundary misorientation significantly impact mechanical properties. The findings demonstrate a marked enhancement in elongation after high-temperature annealing of CoCrNi MEA, suggesting promising applications in environments requiring high ductility. |
| format | Article |
| id | doaj-art-9f45bd4364694d78892b42e56b5b3e7d |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-9f45bd4364694d78892b42e56b5b3e7d2025-01-15T04:11:40ZengElsevierJournal of Materials Research and Technology2238-78542025-03-0135491503Effect of high-temperature heat treatment on mechanical properties and microstructure of CoCrNi medium-entropy alloy formed by laser powder bed fusionLaixia Yang0Mengjia Yang1Yanze Zhang2Qidong Xie3Longbo Zhang4Zhen Chen5Hang Su6School of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an, 710054, ChinaSchool of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an, 710054, ChinaSchool of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an, 710054, ChinaSchool of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, 710049, ChinaSchool of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an, 710054, ChinaSchool of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, 710049, China; Corresponding author.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular, Xi'an, 710065, China; Corresponding author.Laser additive manufacturing (LAM) of high/medium-entropy alloys (H/MEA) possesses considerable industrial promise. In this study, laser powder bed fusion (L-PBF) was employed to fabricate a CoCrNi MEA with excellent strength-ductility synergy. The investigation delves into the microstructural evolution, mechanical properties, and the influence of microstructure on mechanical performance after annealing at 1200 °C for 1, 2, and 4 h. This research addresses deficiencies in traditional processes and native laser additive manufacturing of CoCrNi. Testing and analysis reveal a notable increase in elongation after high-temperature annealing, accompanied by a trend towards equiaxed grain morphology with increasing fractions of recrystallization and annealing twin boundaries, and a gradual reduction in geometric dislocation density. Alterations in grain morphology, dislocation density, fractions of recrystallization, and grain boundary misorientation significantly impact mechanical properties. The findings demonstrate a marked enhancement in elongation after high-temperature annealing of CoCrNi MEA, suggesting promising applications in environments requiring high ductility.http://www.sciencedirect.com/science/article/pii/S2238785424030655Laser powder bed fusionCoCrNi medium-entropy alloyHeat treatmentMicrostructure evolutionMechanical property |
| spellingShingle | Laixia Yang Mengjia Yang Yanze Zhang Qidong Xie Longbo Zhang Zhen Chen Hang Su Effect of high-temperature heat treatment on mechanical properties and microstructure of CoCrNi medium-entropy alloy formed by laser powder bed fusion Journal of Materials Research and Technology Laser powder bed fusion CoCrNi medium-entropy alloy Heat treatment Microstructure evolution Mechanical property |
| title | Effect of high-temperature heat treatment on mechanical properties and microstructure of CoCrNi medium-entropy alloy formed by laser powder bed fusion |
| title_full | Effect of high-temperature heat treatment on mechanical properties and microstructure of CoCrNi medium-entropy alloy formed by laser powder bed fusion |
| title_fullStr | Effect of high-temperature heat treatment on mechanical properties and microstructure of CoCrNi medium-entropy alloy formed by laser powder bed fusion |
| title_full_unstemmed | Effect of high-temperature heat treatment on mechanical properties and microstructure of CoCrNi medium-entropy alloy formed by laser powder bed fusion |
| title_short | Effect of high-temperature heat treatment on mechanical properties and microstructure of CoCrNi medium-entropy alloy formed by laser powder bed fusion |
| title_sort | effect of high temperature heat treatment on mechanical properties and microstructure of cocrni medium entropy alloy formed by laser powder bed fusion |
| topic | Laser powder bed fusion CoCrNi medium-entropy alloy Heat treatment Microstructure evolution Mechanical property |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424030655 |
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