Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder
An equiatomic CoCrFeNiMn high-entropy alloy (HEA) powder is produced by vacuum induction melting gas-atomization with argon gas. A detailed characterization reveals that gas atomized HEA powder is suitable for powder-bed-fusion additive manufacturing (PBFAM). Therefore, the powder with size ranging...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2019
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| Online Access: | https://hdl.handle.net/10356/106671 http://hdl.handle.net/10220/49641 |
| _version_ | 1811687080912224256 |
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| author | Wang, Pan Huang, Pengfei Ng, Fern Lan Sin, Wai Jack Lu, Shenglu Nai, Sharon Mui Ling Dong, ZhiLi Wei, Jun |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Wang, Pan Huang, Pengfei Ng, Fern Lan Sin, Wai Jack Lu, Shenglu Nai, Sharon Mui Ling Dong, ZhiLi Wei, Jun |
| author_sort | Wang, Pan |
| collection | NTU |
| description | An equiatomic CoCrFeNiMn high-entropy alloy (HEA) powder is produced by vacuum induction melting gas-atomization with argon gas. A detailed characterization reveals that gas atomized HEA powder is suitable for powder-bed-fusion additive manufacturing (PBFAM). Therefore, the powder with size ranging from 45 to 106 μm is applied in one of PBFAM, electron beam melting (EBM). The final EBM part is strongly affected by the feedstock. The entrapped gas pores result in a high porosity of EBM-built parts, requesting extra efforts to eliminate the pores for processing parameters optimization. After the optimization, the highly dense EBM-built parts with a hierarchical microstructure and a strong 〈100〉 texture are obtained. The hierarchical microstructure displays long columnar grains containing intragranular cellular structure (dendrites) along build direction. Deformation mechanism of the EBM-built CoCrFeNiMn HEA is dominated by dislocation with limited contribution from mechanical twinning. Experimental results reveal that the cellular structure (dendrites) does not contribute the strength without the pre-existing surrounding dislocation network. As a result, EBM-built CoCrFeNiMn HEA parts exhibit comparable tensile properties to their conventional cast counterparts. It is suggested that the EBM process and gas atomized HEA powder can be employed for fabricating single-phase HEA parts with complex geometry and good mechanical properties. |
| first_indexed | 2024-10-01T05:10:38Z |
| format | Journal Article |
| id | ntu-10356/106671 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:10:38Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/1066712023-07-14T15:54:24Z Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder Wang, Pan Huang, Pengfei Ng, Fern Lan Sin, Wai Jack Lu, Shenglu Nai, Sharon Mui Ling Dong, ZhiLi Wei, Jun School of Materials Science & Engineering Singapore Institute of Manufacturing Technology Engineering::Materials Powder Characteristics Pores An equiatomic CoCrFeNiMn high-entropy alloy (HEA) powder is produced by vacuum induction melting gas-atomization with argon gas. A detailed characterization reveals that gas atomized HEA powder is suitable for powder-bed-fusion additive manufacturing (PBFAM). Therefore, the powder with size ranging from 45 to 106 μm is applied in one of PBFAM, electron beam melting (EBM). The final EBM part is strongly affected by the feedstock. The entrapped gas pores result in a high porosity of EBM-built parts, requesting extra efforts to eliminate the pores for processing parameters optimization. After the optimization, the highly dense EBM-built parts with a hierarchical microstructure and a strong 〈100〉 texture are obtained. The hierarchical microstructure displays long columnar grains containing intragranular cellular structure (dendrites) along build direction. Deformation mechanism of the EBM-built CoCrFeNiMn HEA is dominated by dislocation with limited contribution from mechanical twinning. Experimental results reveal that the cellular structure (dendrites) does not contribute the strength without the pre-existing surrounding dislocation network. As a result, EBM-built CoCrFeNiMn HEA parts exhibit comparable tensile properties to their conventional cast counterparts. It is suggested that the EBM process and gas atomized HEA powder can be employed for fabricating single-phase HEA parts with complex geometry and good mechanical properties. ASTAR (Agency for Sci., Tech. and Research, S’pore) Published version 2019-08-15T02:16:16Z 2019-12-06T22:15:57Z 2019-08-15T02:16:16Z 2019-12-06T22:15:57Z 2019 Journal Article Wang, P., Huang, P., Ng, F. L., Sin, W. J., Lu, S., Nai, S. M. L., . . . Wei, J. (2019). Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder. Materials & Design, 168, 107576-. doi:10.1016/j.matdes.2018.107576 0261-3069 https://hdl.handle.net/10356/106671 http://hdl.handle.net/10220/49641 10.1016/j.matdes.2018.107576 en Materials & Design © 2019 Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). 13 p. application/pdf |
| spellingShingle | Engineering::Materials Powder Characteristics Pores Wang, Pan Huang, Pengfei Ng, Fern Lan Sin, Wai Jack Lu, Shenglu Nai, Sharon Mui Ling Dong, ZhiLi Wei, Jun Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder |
| title | Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder |
| title_full | Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder |
| title_fullStr | Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder |
| title_full_unstemmed | Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder |
| title_short | Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder |
| title_sort | additively manufactured cocrfenimn high entropy alloy via pre alloyed powder |
| topic | Engineering::Materials Powder Characteristics Pores |
| url | https://hdl.handle.net/10356/106671 http://hdl.handle.net/10220/49641 |
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