发布时间：2026-08-23

影响因子：15.4

DOI码：10.1016/j.ijplas.2026.104802

论文名称：Cryogenic ultra-strong and ductile complex concentrated alloys achieved via non-equilibrium-solidification-enabled controlled recrystallization and multimodal precipitation

发表刊物：International Journal of Plasticity

关键字：Heterostructure engineering is an effective strategy for extending the performance limits of metallic materials under extreme conditions through the deliberate introduction of interfacial complexity and chemical partitioning. Nevertheless, the reliance of conventional heterostructure fabrication on multi-stage thermomechanical processing severely limits its compatibility with near-net-shape components, particularly those fabricated via additive manufacturing. Here, we report a novel laser powder bed fusion-enabled heterostructure design strategy that harnesses far-from-equilibrium interfacial topologies to orchestrate hierarchical microstructural evolution in a Ni-rich complex concentrated alloy (NCCA). By leveraging the high-energy non-equilibrium interfacial network coupled with the intrinsic chemical segregation generated during rapid solidification, the tailored single-step heat treatment induces extensive yet spatially constrained recrystallization alongside site-specific multimodal L12 precipitation. The resulting architectured alloy exhibits an exceptional combination of cryogenic mechanical properties, including an ultimate tensile strength of ∼1.9 GPa, a sustained work-hardening rate exceeding 5 GPa, and a uniform elongation of ∼19% at 77 K, surpassing the performance envelope of most reported additively manufactured alloys to date. More importantly, quasi-in-situ tracking of defect evolution reveals pronounced hetero-deformation induced hardening together with an adaptive strain-accommodation mechanism driven by the sequential activation of multiple defect carriers. Specifically, the dynamic interactions between superlattice dislocation pairs and the evolving stacking-fault network promote progressive strain delocalization and sustain ultrahigh work hardening over a broad strain regime, thereby reconciling the strength–ductility antagonism at cryogenic temperatures. These findings provide a new pathway for integrating heterostructure engineering with additive manufacturing through non-equilibrium interfacial design.

第一作者：YS Li, LQ Cui, KH Jiang, TK Sun, TB Wei, YY Wang, W Zhao, ZH Chen, TZ Xin, LC Zhou, WF He

论文类型：期刊论文

学科门类：工学

一级学科：机械

文献类型：J

是否译文：否

发表时间：2026-08-19

收录刊物：SCI、SSCI、ESI

发布期刊链接：https://doi.org/10.1016/j.ijplas.2026.104802