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Enhanced mechanical properties of LPBF-fabricated CoCrNi/TiN composites via in-situ nanoparticle reinforcement

Authors: Tang, L., Xiao, C., Ni, S., Jiang, W., Fan, C., Chen, Z., Huang, Y., Song, M.

Journal: Intermetallics

Publication Date: 01/01/2026

Volume: 188

ISSN: 0966-9795

DOI: 10.1016/j.intermet.2025.109084

Abstract:

The incorporation of ceramic nanoparticles into medium-entropy alloys offers a promising route to enhance mechanical performance through microstructural engineering. In this study, CoCrNi composites reinforced with 1–2 wt% TiN nanoparticles were fabricated via laser powder bed fusion (LPBF), achieving a remarkable synergy of strength and ductility. The addition of 1 wt% TiN increased the yield strength and ultimate tensile strength from 694.5 MPa to 955 MPa–806 MPa and 1084 MPa, respectively, while the fracture elongation remained comparable (33 % → 33.5 %). During LPBF, TiN nanoparticles decomposed in situ, forming semi-coherent TiN and TiO2 precipitates. By exerting a pinning effect and raising the energy barriers for twin propagation, these semi-coherent particles suppress twin formation and growth. Strengthening mechanisms were quantitatively assessed, revealing a dominant contribution from precipitation hardening (136.9 MPa and 205.1 MPa for 1 wt% and 2 wt% TiN, respectively), supplemented by dislocation, grain boundary, and strain hardening effects. This work demonstrates the potential of LPBF-processed CoCrNi-TiN composites for high-performance applications and provides a framework for tailoring strength-ductility balance via nanoparticle-induced microstructural control.

https://eprints.bournemouth.ac.uk/41498/

Source: Scopus

Enhanced mechanical properties of LPBF-fabricated CoCrNi/TiN composites via in-situ nanoparticle reinforcement

Authors: Tang, L., Xiao, C., Ni, S., Jiang, W., Fan, C., Chen, Z., Huang, Y., Song, M.

Journal: INTERMETALLICS

Publication Date: 2026

Volume: 188

eISSN: 1879-0216

ISSN: 0966-9795

DOI: 10.1016/j.intermet.2025.109084

https://eprints.bournemouth.ac.uk/41498/

Source: Web of Science

Enhanced mechanical properties of LPBF-fabricated CoCrNi/TiN composites via in-situ nanoparticle reinforcement

Authors: Tang, L., Xiao, C., Ni, S., Jiang, W., Fan, C., Chen, Z., Huang, Y., Song, M.

Journal: Intermetallics

Publication Date: 15/01/2026

Volume: 188

Pages: 109084(1)-109084(15)

Publisher: Elsevier

eISSN: 1879-0216

ISSN: 0966-9795

DOI: 10.1016/j.intermet.2025.109084

Abstract:

The incorporation of ceramic nanoparticles into medium-entropy alloys offers a promising route to enhance mechanical performance through microstructural engineering. In this study, CoCrNi composites reinforced with 1–2 wt% TiN nanoparticles were fabricated via laser powder bed fusion (LPBF), achieving a remarkable synergy of strength and ductility. The addition of 1 wt% TiN increased the yield strength and ultimate tensile strength from 694.5 MPa and 955 MPa to 806 MPa and 1084 MPa, respectively, while the fracture elongation remained comparable (33% → 33.5%). During LPBF, TiN nanoparticles decomposed in situ, forming semi-coherent TiN and TiO2 precipitates. By exerting a pinning effect and raising the energy barriers for twin propagation, these semi-coherent particles suppress twin formation and growth. Strengthening mechanisms were quantitatively assessed, revealing a dominant contribution from precipitation hardening (136.9 MPa and 205.1 MPa for 1 wt% and 2 wt% TiN, respectively), supplemented by dislocation, grain boundary, and strain hardening effects. This work demonstrates the potential of LPBF-processed CoCrNi-TiN composites for high-performance applications and provides a framework for tailoring strength-ductility balance via nanoparticle-induced microstructural control.

https://eprints.bournemouth.ac.uk/41498/

Source: Manual

Preferred by: Yi Huang