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Volume 17
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10.3390/ma17194795
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Article

Effect of Deposit Scale on Mechanical Properties of In-Situ Alloyed CrCoNi Medium Entropy Alloys Formed by Directed Energy Deposition

by
Pengsheng Xue
1,2,*,
Dengke Liu
1,
Zhongtang Gao
1,
Guodong Wen
1,
Yuan Ren
3 and
Xiangang Cao
1,*
1
School of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
2
School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China
3
State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
*
Authors to whom correspondence should be addressed.
Materials 2024, 17(19), 4795; https://doi.org/10.3390/ma17194795
Submission received: 8 September 2024 / Revised: 26 September 2024 / Accepted: 26 September 2024 / Published: 29 September 2024
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Abstract

Directed energy deposition (DED), as an additive manufacturing technology, has shown unique advantages in multi-material additive manufacturing and remanufacturing. In this study, two types in-situ alloyed CrCoNi medium entropy alloys that have thin-walled structures with different thicknesses (T1 and T2) were manufactured by the DED process, and the mechanisms of differences in relative density, microstructure, and mechanical properties at different heights were systematically analyzed. In terms of microstructure, the T1 and T2 samples along the building direction exhibit significant differences in crystallographic orientation, grain size, and dislocation density, which are related to the local temperature gradient differences caused by the scanning path and heat accumulation. In terms of mechanical properties at different heights of the two types of thin-walled structures, the yield strength is higher but the elongation is lower at the bottom position of sample, while the yield strength is lower but the elongation is higher at the middle and top positions. The differences of mechanical properties at different heights of the T1 and T2 samples are related to the microstructure and relative density. This finding provides new insights for the design and performance analysis of complex thin-walled structures formed by additive manufacturing.
Keywords: medium entropy alloy; additive manufacturing; in-situ alloying; deposit scale; mechanical properties medium entropy alloy; additive manufacturing; in-situ alloying; deposit scale; mechanical properties

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MDPI and ACS Style

Xue, P.; Liu, D.; Gao, Z.; Wen, G.; Ren, Y.; Cao, X. Effect of Deposit Scale on Mechanical Properties of In-Situ Alloyed CrCoNi Medium Entropy Alloys Formed by Directed Energy Deposition. Materials 2024, 17, 4795. https://doi.org/10.3390/ma17194795

AMA Style

Xue P, Liu D, Gao Z, Wen G, Ren Y, Cao X. Effect of Deposit Scale on Mechanical Properties of In-Situ Alloyed CrCoNi Medium Entropy Alloys Formed by Directed Energy Deposition. Materials. 2024; 17(19):4795. https://doi.org/10.3390/ma17194795

Chicago/Turabian Style

Xue, Pengsheng, Dengke Liu, Zhongtang Gao, Guodong Wen, Yuan Ren, and Xiangang Cao. 2024. "Effect of Deposit Scale on Mechanical Properties of In-Situ Alloyed CrCoNi Medium Entropy Alloys Formed by Directed Energy Deposition" Materials 17, no. 19: 4795. https://doi.org/10.3390/ma17194795

APA Style

Xue, P., Liu, D., Gao, Z., Wen, G., Ren, Y., & Cao, X. (2024). Effect of Deposit Scale on Mechanical Properties of In-Situ Alloyed CrCoNi Medium Entropy Alloys Formed by Directed Energy Deposition. Materials, 17(19), 4795. https://doi.org/10.3390/ma17194795

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