Microstructural evolution of (FeCoNi)85.84Al7.07Ti7.09 high-entropy alloy fabricated by an optimized selective laser melting process
High-entropy alloy (HEA) FeCoNiAlTi (FCNAT) systems have been demonstrated to provide high strength while sustaining good ductility, which is of particular interest for the fabrication of structural components with complex geometries. Meanwhile, selective laser melting (SLM) technology that fabricat...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127522009480 |
| _version_ | 1797980434663997440 |
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| author | Pengcheng Ji Zhenhui Wang Yongkun Mu YanDong Jia Gang Wang |
| author_facet | Pengcheng Ji Zhenhui Wang Yongkun Mu YanDong Jia Gang Wang |
| author_sort | Pengcheng Ji |
| collection | DOAJ |
| description | High-entropy alloy (HEA) FeCoNiAlTi (FCNAT) systems have been demonstrated to provide high strength while sustaining good ductility, which is of particular interest for the fabrication of structural components with complex geometries. Meanwhile, selective laser melting (SLM) technology that fabricated metallic material using layer-by-layer melting strategy can meet this demand. However, SLM fabrication technology has not yet been applied in conjunction with FCNAT-HEA systems, and the optimal SLM processing parameters and the microstructural characteristics of the resulting components remain unknown. The present study addresses this issue by fabricating highly dense (>99.9 %) cubic (FeCoNi)85.84Al7.09Ti7.07 FCNAT-HEA samples. The results demonstrate that the as-fabricated FCNAT-HEA samples possess highly non-equilibrium microstructures that form under the rapid heating and cooling cycles of the SLM process, and include typical overlapping between semi-elliptical melt pools, widely varying grain morphologies with coarse columnar grains and typical equiaxed grains with 〈001〉 growth orientation, dislocation network structures with elemental Ti and Al segregation, high-density L21-phase precipitates with sizes on the order of 200–300 nm, and near-spherical nano-sized Al-oxide particles. This research confirms the feasibility of fabricating FCNAT-HEA components by SLM, and therefore provides guidance for fabricating such HEA components with complex geometries. |
| first_indexed | 2024-04-11T05:54:31Z |
| format | Article |
| id | doaj.art-8ef448b3bc274e158f53152e1202ad2e |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-11T05:54:31Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-8ef448b3bc274e158f53152e1202ad2e2022-12-22T04:41:57ZengElsevierMaterials & Design0264-12752022-12-01224111326Microstructural evolution of (FeCoNi)85.84Al7.07Ti7.09 high-entropy alloy fabricated by an optimized selective laser melting processPengcheng Ji0Zhenhui Wang1Yongkun Mu2YanDong Jia3Gang Wang4Institute of Materials, Shanghai University, Shanghai 200444, ChinaInstitute of Materials, Shanghai University, Shanghai 200444, ChinaInstitute of Materials, Shanghai University, Shanghai 200444, ChinaInstitute of Materials, Shanghai University, Shanghai 200444, China; Zhejiang Institute of Advanced Materials, Shanghai University, Jiashan 314100, ChinaInstitute of Materials, Shanghai University, Shanghai 200444, China; Zhejiang Institute of Advanced Materials, Shanghai University, Jiashan 314100, ChinaHigh-entropy alloy (HEA) FeCoNiAlTi (FCNAT) systems have been demonstrated to provide high strength while sustaining good ductility, which is of particular interest for the fabrication of structural components with complex geometries. Meanwhile, selective laser melting (SLM) technology that fabricated metallic material using layer-by-layer melting strategy can meet this demand. However, SLM fabrication technology has not yet been applied in conjunction with FCNAT-HEA systems, and the optimal SLM processing parameters and the microstructural characteristics of the resulting components remain unknown. The present study addresses this issue by fabricating highly dense (>99.9 %) cubic (FeCoNi)85.84Al7.09Ti7.07 FCNAT-HEA samples. The results demonstrate that the as-fabricated FCNAT-HEA samples possess highly non-equilibrium microstructures that form under the rapid heating and cooling cycles of the SLM process, and include typical overlapping between semi-elliptical melt pools, widely varying grain morphologies with coarse columnar grains and typical equiaxed grains with 〈001〉 growth orientation, dislocation network structures with elemental Ti and Al segregation, high-density L21-phase precipitates with sizes on the order of 200–300 nm, and near-spherical nano-sized Al-oxide particles. This research confirms the feasibility of fabricating FCNAT-HEA components by SLM, and therefore provides guidance for fabricating such HEA components with complex geometries.http://www.sciencedirect.com/science/article/pii/S0264127522009480Selective laser meltingHigh-entropy alloyDislocation network structureCellular structureProcess parameter optimization |
| spellingShingle | Pengcheng Ji Zhenhui Wang Yongkun Mu YanDong Jia Gang Wang Microstructural evolution of (FeCoNi)85.84Al7.07Ti7.09 high-entropy alloy fabricated by an optimized selective laser melting process Materials & Design Selective laser melting High-entropy alloy Dislocation network structure Cellular structure Process parameter optimization |
| title | Microstructural evolution of (FeCoNi)85.84Al7.07Ti7.09 high-entropy alloy fabricated by an optimized selective laser melting process |
| title_full | Microstructural evolution of (FeCoNi)85.84Al7.07Ti7.09 high-entropy alloy fabricated by an optimized selective laser melting process |
| title_fullStr | Microstructural evolution of (FeCoNi)85.84Al7.07Ti7.09 high-entropy alloy fabricated by an optimized selective laser melting process |
| title_full_unstemmed | Microstructural evolution of (FeCoNi)85.84Al7.07Ti7.09 high-entropy alloy fabricated by an optimized selective laser melting process |
| title_short | Microstructural evolution of (FeCoNi)85.84Al7.07Ti7.09 high-entropy alloy fabricated by an optimized selective laser melting process |
| title_sort | microstructural evolution of feconi 85 84al7 07ti7 09 high entropy alloy fabricated by an optimized selective laser melting process |
| topic | Selective laser melting High-entropy alloy Dislocation network structure Cellular structure Process parameter optimization |
| url | http://www.sciencedirect.com/science/article/pii/S0264127522009480 |
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