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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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424030655 |
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| Summary: | 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. |
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| ISSN: | 2238-7854 |