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Laser powder bed fusion of a high-performance high-entropy alloy produced by designed powder blending and tailored post-treatment.

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Title: Laser powder bed fusion of a high-performance high-entropy alloy produced by designed powder blending and tailored post-treatment.
Authors: Cao, Boxuan1 (AUTHOR) caoboxuan@hit.edu.cn, Wang, Shanshan1,2,3 (AUTHOR), Xu, Weiwei1,4 (AUTHOR), Jia, Yunfeng1,2,3 (AUTHOR), Zhang, Weijian1,2,3 (AUTHOR), Chen, Ruiguang5 (AUTHOR), Wang, Yixiang1 (AUTHOR), Shi, Rongpei1 (AUTHOR), Liu, Weihong1 (AUTHOR), Zhao, Yilu1 (AUTHOR), Yu, Suzhu1,2,3 (AUTHOR) szyu@hit.edu.cn, Wei, Jun1,2,3 (AUTHOR) junwei@hit.edu.cn
Source: Journal of Alloys & Compounds. Dec2025, Vol. 1049, pN.PAG-N.PAG. 1p.
Subjects: Tensile strength, Alloys, Solid freeform fabrication, Mechanical behavior of materials, Selective laser melting, Powders, Crystal structure
Abstract: As a revolutionary technology, additive manufacturing offers a promising path for producing components in near-net shape. We demonstrate the feasibility of fabricating high-performance alloy through tailored powder blending and post-treatment using the laser powder bed fusion technique. With the aid of first-principle calculation, we select commercially available Ti6Al4V alloy powder and CoCrFeNi high-entropy alloy powder mixtures as raw materials for additive manufacturing. Appropriate post-treatment helps to mitigate strain-age cracking and heterogeneous grain boundary precipitation, contributing to the formation of high-density coherent L1 2 nanoprecipitates. By leveraging powder blending and post-treatment strategy, we achieved a significantly improved tensile strength (over 1.1 GPa) and sustained work-hardening without sacrificing tensile ductility (over 25 %). In particular, we find that Al and Co additions are critical for the stabilization of the L1 2 structure and suppress the brittle D0 24 -type Ni 3 Ti phase formation. The current work offers a promising outlook for preparing high-performance structural materials through powder blending and tailored post-treatment via additive manufacturing. • First-principle calculation aided raw materials combination designing for laser powder bed fusion. • Suitable post-treatment could mitigate strain-age cracking and heterogeneous grain boundary precipitation. • Appropriate powder blending and post-treatment strategy could significantly improve mechanical properties. • Al and Co additions help to stabilize the L12 structure and suppress the brittle D024-type Ni3Ti phase. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:As a revolutionary technology, additive manufacturing offers a promising path for producing components in near-net shape. We demonstrate the feasibility of fabricating high-performance alloy through tailored powder blending and post-treatment using the laser powder bed fusion technique. With the aid of first-principle calculation, we select commercially available Ti6Al4V alloy powder and CoCrFeNi high-entropy alloy powder mixtures as raw materials for additive manufacturing. Appropriate post-treatment helps to mitigate strain-age cracking and heterogeneous grain boundary precipitation, contributing to the formation of high-density coherent L1 2 nanoprecipitates. By leveraging powder blending and post-treatment strategy, we achieved a significantly improved tensile strength (over 1.1 GPa) and sustained work-hardening without sacrificing tensile ductility (over 25 %). In particular, we find that Al and Co additions are critical for the stabilization of the L1 2 structure and suppress the brittle D0 24 -type Ni 3 Ti phase formation. The current work offers a promising outlook for preparing high-performance structural materials through powder blending and tailored post-treatment via additive manufacturing. • First-principle calculation aided raw materials combination designing for laser powder bed fusion. • Suitable post-treatment could mitigate strain-age cracking and heterogeneous grain boundary precipitation. • Appropriate powder blending and post-treatment strategy could significantly improve mechanical properties. • Al and Co additions help to stabilize the L12 structure and suppress the brittle D024-type Ni3Ti phase. [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2025.185335