@article{Chen2026, 
author = {Nan Chen and Kefu Gan and Dan Zheng and Pengda Niu and Haoping Peng and Tiechui Yuan and Ruidi Li},
title = {Achieving exceptional strength-ductility synergy in additively manufactured Hastelloy X superalloys by stabilizing cellular structures via Ta addition},
year = {2026},
journal = {International Journal of Extreme Manufacturing},
volume = {8},
number = {2},
keywords = {additive manufacturing, Hastelloy X superalloys, cellular structures, elemental segregation, strength-ductility synergy},
url = {https://www.sciopen.com/article/10.1088/2631-7990/ae22de},
doi = {10.1088/2631-7990/ae22de},
abstract = {Additive manufacturing of Hastelloy X superalloys remains challenges for practical aerospace applications due to the inadequate mechanical property at both ambient and high temperatures. To this end, this work proposes a novel Ta-modified strategy manipulating elemental segregation to stabilize cellular structures, thereby obtaining an outstanding combination between strength and ductility across a wide temperature regime. In particular, the tensile strength and elongation of Ta-modified superalloys can reach up to 1214 MPa and 28.4%, respectively, highly increased by 47% and 10% compared to original Hastelloy X superalloys at 25 ℃. Meanwhile, the tensile strength and elongation at 650 ℃ significantly increase to 843 MPa and 26.8% respectively, 38% and 150% stronger than their counterparts of the original Ta-free Hastelloy X superalloys at identical conditions. Microstructural observations reveal that prominent local segregation of Ta/Mo elements and in situ MC precipitates along cellular boundaries synergistically enhanced the stability of cellular structures. The stabilized cellular structures serve as continuous and skeleton-like networks during deformation, synergistically contributing to outstanding ductility and enhanced mechanical strength, as well as sustained strain-hardening ability. The present work provides new insights into an efficient alloy design method for additively manufactured nickel-based superalloys with outstanding mechanical property within a wide temperature regime.}
}