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| Hauptverfasser: | , , , , , , , , , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| Online-Zugang: | https://arxiv.org/abs/2512.21745 |
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| _version_ | 1866911339208769536 |
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| author | Liu, Shaozun Li, Zehao Chen, Hantong San, Xingyuan Zhou, Bi-Cheng Isheim, Dieter Wang, Tiejun Gao, Hong Zhao, Nie Liu, Yu Gan, Yong Hu, Xiaobing |
| author_facet | Liu, Shaozun Li, Zehao Chen, Hantong San, Xingyuan Zhou, Bi-Cheng Isheim, Dieter Wang, Tiejun Gao, Hong Zhao, Nie Liu, Yu Gan, Yong Hu, Xiaobing |
| contents | Ni-W based medium heavy alloys offer a promising pathway to bridge the density-strength gap between tungsten heavy alloys and ultrahigh-strength steels. In this study, the effects of W concentration on short-range order (SRO), deformation behavior, and grain boundary chemistry of Ni-xW alloys in the range x = 0 to 38 wt% were systematically investigated using a suite of advanced characterization and modeling techniques, including synchrotron X-ray diffraction, transmission electron microscopy, atom probe tomography, and first-principles thermodynamic simulations. Our study reveals that strong SRO emerges when W content exceeds about 30 wt%, producing distinct diffuse scattering and significantly enhancing strain-hardening capacity. During deformation, the presence of SRO promotes planar slip and twin formation, leading to strong dislocation interactions and elevated flow stress. Hall-Petch analysis demonstrates an exceptionally high grain boundary strengthening coefficient (ky about 1100 MPa micrometer^(1/2)) in Ni-38W, underscoring the intrinsic strengthening effect associated with SRO. First-principles cluster expansion coupled with Monte Carlo simulations reveals that increasing W content enhances SRO tendency through the stabilization of Ni4W-type local configurations. These findings establish a mechanistic link between W concentration, SRO evolution, and mechanical response, providing new insights for designing high-density, high-strength Ni-W based alloys with optimized performance. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_21745 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Concentration-Dependent Tungsten Effects on Short-Range Order and Deformation Behavior in Ni-W alloys Liu, Shaozun Li, Zehao Chen, Hantong San, Xingyuan Zhou, Bi-Cheng Isheim, Dieter Wang, Tiejun Gao, Hong Zhao, Nie Liu, Yu Gan, Yong Hu, Xiaobing Materials Science Ni-W based medium heavy alloys offer a promising pathway to bridge the density-strength gap between tungsten heavy alloys and ultrahigh-strength steels. In this study, the effects of W concentration on short-range order (SRO), deformation behavior, and grain boundary chemistry of Ni-xW alloys in the range x = 0 to 38 wt% were systematically investigated using a suite of advanced characterization and modeling techniques, including synchrotron X-ray diffraction, transmission electron microscopy, atom probe tomography, and first-principles thermodynamic simulations. Our study reveals that strong SRO emerges when W content exceeds about 30 wt%, producing distinct diffuse scattering and significantly enhancing strain-hardening capacity. During deformation, the presence of SRO promotes planar slip and twin formation, leading to strong dislocation interactions and elevated flow stress. Hall-Petch analysis demonstrates an exceptionally high grain boundary strengthening coefficient (ky about 1100 MPa micrometer^(1/2)) in Ni-38W, underscoring the intrinsic strengthening effect associated with SRO. First-principles cluster expansion coupled with Monte Carlo simulations reveals that increasing W content enhances SRO tendency through the stabilization of Ni4W-type local configurations. These findings establish a mechanistic link between W concentration, SRO evolution, and mechanical response, providing new insights for designing high-density, high-strength Ni-W based alloys with optimized performance. |
| title | Concentration-Dependent Tungsten Effects on Short-Range Order and Deformation Behavior in Ni-W alloys |
| topic | Materials Science |
| url | https://arxiv.org/abs/2512.21745 |