Pulsed-wave laser additive manufacturing of CrCoNi medium-entropy alloys with high strength and ductility
One of the most popular medium- and high-entropy alloys is CrCoNi alloy, renowned for its outstanding mechanical properties, particularly at cryogenic temperatures. However, further enhancing the yield strength of CrCoNi at room temperature while maintaining its high ductility remains challenging. I...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2025
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| Online Access: | https://hdl.handle.net/10356/182487 |
| _version_ | 1826126885109628928 |
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| author | Gao, Shubo Ji, Weiming Zhu, Qi Jarlöv, Asker Shen, Xiaojun Bai, Xueyu Zhu, Chenyang Lek, Yung Zhen Xiao, Zhongmin Zhou, Kun |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Gao, Shubo Ji, Weiming Zhu, Qi Jarlöv, Asker Shen, Xiaojun Bai, Xueyu Zhu, Chenyang Lek, Yung Zhen Xiao, Zhongmin Zhou, Kun |
| author_sort | Gao, Shubo |
| collection | NTU |
| description | One of the most popular medium- and high-entropy alloys is CrCoNi alloy, renowned for its outstanding mechanical properties, particularly at cryogenic temperatures. However, further enhancing the yield strength of CrCoNi at room temperature while maintaining its high ductility remains challenging. In this study, we explore the potential of using a pulsed-wave laser in the powder bed fusion, a dominant metal additive manufacturing (AM) technique, to achieve exceptional room-temperature strength–ductility synergy in CrCoNi alloy. The pulsed-wave laser induces extra thermal cycles, generating additional pre-existing dislocations that are uniformly distributed within the interiors of solidification cells, a phenomenon distinct from conventional AM. These pre-existing dislocations not only enhance the room-temperature yield strength exceeding 800 MPa but also trigger the onset of deformation twinning prior to 2% strain. This early activation of deformation twinning contributes to steady work hardening throughout the entire plastic deformation, resulting in a large uniform elongation of nearly 40%. Our work offers valuable insights for designing novel AM processes with pulsed-wave lasers to advance the fabrication of high-value and high-performance alloys. |
| first_indexed | 2025-03-09T14:25:08Z |
| format | Journal Article |
| id | ntu-10356/182487 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-03-09T14:25:08Z |
| publishDate | 2025 |
| record_format | dspace |
| spelling | ntu-10356/1824872025-02-04T07:06:11Z Pulsed-wave laser additive manufacturing of CrCoNi medium-entropy alloys with high strength and ductility Gao, Shubo Ji, Weiming Zhu, Qi Jarlöv, Asker Shen, Xiaojun Bai, Xueyu Zhu, Chenyang Lek, Yung Zhen Xiao, Zhongmin Zhou, Kun School of Mechanical and Aerospace Engineering School of Electrical and Electronic Engineering Singapore Centre for 3D Printing Singapore Institute of Manufacturing Technology Engineering Medium-entropy alloy Additive manufacturing One of the most popular medium- and high-entropy alloys is CrCoNi alloy, renowned for its outstanding mechanical properties, particularly at cryogenic temperatures. However, further enhancing the yield strength of CrCoNi at room temperature while maintaining its high ductility remains challenging. In this study, we explore the potential of using a pulsed-wave laser in the powder bed fusion, a dominant metal additive manufacturing (AM) technique, to achieve exceptional room-temperature strength–ductility synergy in CrCoNi alloy. The pulsed-wave laser induces extra thermal cycles, generating additional pre-existing dislocations that are uniformly distributed within the interiors of solidification cells, a phenomenon distinct from conventional AM. These pre-existing dislocations not only enhance the room-temperature yield strength exceeding 800 MPa but also trigger the onset of deformation twinning prior to 2% strain. This early activation of deformation twinning contributes to steady work hardening throughout the entire plastic deformation, resulting in a large uniform elongation of nearly 40%. Our work offers valuable insights for designing novel AM processes with pulsed-wave lasers to advance the fabrication of high-value and high-performance alloys. National Research Foundation (NRF) This work was supported by the National Research Foundation, Prime Minister’s Office, Singapore under its Medium-Sized Centre funding scheme. 2025-02-04T07:06:11Z 2025-02-04T07:06:11Z 2024 Journal Article Gao, S., Ji, W., Zhu, Q., Jarlöv, A., Shen, X., Bai, X., Zhu, C., Lek, Y. Z., Xiao, Z. & Zhou, K. (2024). Pulsed-wave laser additive manufacturing of CrCoNi medium-entropy alloys with high strength and ductility. Materials Today, 81, 36-46. https://dx.doi.org/10.1016/j.mattod.2024.10.004 1369-7021 https://hdl.handle.net/10356/182487 10.1016/j.mattod.2024.10.004 2-s2.0-85207361256 81 36 46 en Materials Today © 2024 Published by Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering Medium-entropy alloy Additive manufacturing Gao, Shubo Ji, Weiming Zhu, Qi Jarlöv, Asker Shen, Xiaojun Bai, Xueyu Zhu, Chenyang Lek, Yung Zhen Xiao, Zhongmin Zhou, Kun Pulsed-wave laser additive manufacturing of CrCoNi medium-entropy alloys with high strength and ductility |
| title | Pulsed-wave laser additive manufacturing of CrCoNi medium-entropy alloys with high strength and ductility |
| title_full | Pulsed-wave laser additive manufacturing of CrCoNi medium-entropy alloys with high strength and ductility |
| title_fullStr | Pulsed-wave laser additive manufacturing of CrCoNi medium-entropy alloys with high strength and ductility |
| title_full_unstemmed | Pulsed-wave laser additive manufacturing of CrCoNi medium-entropy alloys with high strength and ductility |
| title_short | Pulsed-wave laser additive manufacturing of CrCoNi medium-entropy alloys with high strength and ductility |
| title_sort | pulsed wave laser additive manufacturing of crconi medium entropy alloys with high strength and ductility |
| topic | Engineering Medium-entropy alloy Additive manufacturing |
| url | https://hdl.handle.net/10356/182487 |
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