About this Abstract |
| Meeting |
TMS Specialty Congress 2026
|
| Symposium
|
4th World Congress on High Entropy Alloys (HEA 2026)
|
| Presentation Title |
Influence of Ti on the Mechanical Properties and Strengthening Mechanisms of In-Situ Alloyed CoCrNi Processed via Laser Powder Bed Fusion |
| Author(s) |
Ameer Hamza Khan, Sri Bala Aditya Malladi, Márcio Sangali, João Felipe Q. Rodrigues, Rubens Caram, Sheng Guo, Kaio Niitsu Campo |
| On-Site Speaker (Planned) |
Ameer Hamza Khan |
| Abstract Scope |
This study examines the mechanical response of a CoCrNi medium-entropy alloy modified with titanium via laser powder bed fusion. Based on thermodynamic predictions, a (CoCrNi)97Ti3 composition was synthesized by in-situ alloying, achieving relative densities exceeding 99.9% without solidification cracking. While both alloys exhibited similar hardness near 300 HV, tensile testing revealed a significant strengthening effect. Titanium incorporation increased yield strength from 660 MPa to 727 MPa (11% improvement) and ultimate tensile strength from 889 MPa to 939 MPa (5.6% improvement). This enhancement is attributed to solid-solution strengthening arising from the larger atomic radius of Ti. Although a characteristic strength-ductility trade-off reduced fracture elongation from 27.6% to 20.6%, fractography confirmed ductile failure modes with dimpled features. Consistent strain-hardening behavior suggests that Ti reinforces the matrix without introducing distinct deformation mechanisms. These findings indicate a viable route for tailoring mechanical performance in medium-entropy alloys through elemental modification and additive manufacturing. |
| Proceedings Inclusion? |
Undecided |