2026-10-15T08:25:08Z https://data.mendeley.com/oai

oai:data.mendeley.com/b87vbsz97z.1 2026-01-07T08:05:53Z

xia, yue Effect of heat treatment on grain boundary character and strength-ductility synergy in additive-manufactured Hastelloy X Mendeley Data Nickel-based superalloys fabricated by selective laser melting often suffer from a strength-ductility trade-off due to non-equilibrium microstructures. Here, we demonstrate that this limitation can be overcome by grain boundary engineering through multi-stage heat treatments. In Hastelloy X, solution treatment at 1175°C followed by furnace cooling triggers complete recrystallization, producing an optimal microstructure with a high fraction of Σ3 annealing twins (22.1%) and high-angle grain boundaries (64.6%). This unique configuration, along with uniformly distributed grain boundary carbides, promotes strain-accommodating boundary sliding and alleviates dislocation pile-up. Consequently, the material achieves an exceptional strength-ductility synergy (ultimate tensile strength: 663.5 MPa; ductility: 43.7%), representing a 30.4% enhancement in ductility over conventional forged material. We reveal that the enhanced performance stems from a transition in the dominant strengthening mechanism, where solid solution strengthening effectively compensates for the reduced contribution from grain boundaries. This work provides a microstructural design strategy to unlock the full potential of additive manufacturing for high-performance alloys. Materials Science Heat Treatment Hall-Petch Strengthening Design for Additive Manufacture Yue, yuexia Bao, Ziming Lian, lixian Liu, ying Gong, xiufang Li, wenjing Huang, xucan Nie, liping Gao, zhenhuan Dataset doi:10.17632/b87vbsz97z.1 oai:data.mendeley.com/b87vbsz97z.1 Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0 https://data.mendeley.com/datasets/b87vbsz97z 2026-01-07T08:05:53Z