Improvement in creep life of a nickel-based single-crystal superalloy via composition homogeneity on the multiscales by magnetic-field-assisted directional solidification.
Improvement in creep life of a nickel-based single-crystal superalloy via composition homogeneity on the multiscales by magnetic-field-assisted directional solidification.
复制标题
磁场辅助定向凝固通过多尺度成分均匀性提高镍基单晶高温合金的蠕变寿命
DOI：
10.1038/s41598-018-19800-5
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发表时间：
2018-01-23
影响因子：
4.6
通讯作者：
Liaw PK
中科院分区：
文献类型：
--
作者：
Ren W;Niu C;Ding B;Zhong Y;Yu J;Ren Z;Liu W;Ren L;Liaw PK
航空、航天和燃气发动机日益增长的巨大需求一直有力地推动着单晶高温合金蠕变性能的提升。在这项研究中，静态磁场辅助凝固工艺显著提高了单晶高温合金的蠕变寿命。其机制源于多尺度上成分均匀性的提高，这进一步降低了γ/γ′相的晶格错配并影响了相的析出。相析出的变化表现为γ′尺寸以及碳化物和γ/γ′共晶含量的减少，这可以通过断口附近裂纹数量和筏排厚度的变化进一步验证。元素分配的变化减少了样品在蠕变变形过程中γ/γ′相内的位错数量。尽管研究中的磁场破坏了单晶的完整性，但它并没有抵消成分均匀性带来的益处。由于其易于实施，所提出的方法在工业上显示出巨大的潜在应用价值。所揭示的机制为利用磁场控制多组分、多相合金的微观结构和力学性能提供了指导。
The improvement of the creep properties of single-crystal superalloys is always strongly motivated by the vast growing demand from the aviation, aerospace, and gas engine. In this study, a static magnetic-field-assisted solidification process significantly improves the creep life of single-crystal superalloys. The mechanism originates from an increase in the composition homogeneity on the multiscales, which further decreases the lattice misfit of γ/γ′ phases and affects the phase precipitation. The phase-precipitation change is reflected as the decrease in the γ′ size and the contents of carbides and γ/γ′ eutectic, which can be further verified by the variation of the cracks number and raft thickness near the fracture surface. The variation of element partition decreases the dislocation quantity within the γ/γ′ phases of the samples during the crept deformation. Though the magnetic field in the study destroys the single-crystal integrity, it does not offset the benefits from the compositional homogeneity. The proposed means shows a great potential application in industry owing to its easy implement. The uncovered mechanism provides a guideline for controlling microstructures and mechanical properties of alloys with multiple components and multiple phases using a magnetic field.
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DOI：
10.1007/s11661-011-0920-8
发表时间：
2012-03-01
影响因子：
2.8
作者：
Brundidge, C. L.;Vandrasek, D.;Pollock, T. M.
通讯作者：
Pollock, T. M.
影响因子：
6.2
作者：
Hu, Shaodong;Dai, Yanchao;Li, Xi
通讯作者：
Li, Xi
DOI：
10.1007/bf02647026
发表时间：
1987-11-01
期刊：
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
影响因子：
--
作者：
NATHAL, MV
通讯作者：
NATHAL, MV
影响因子：
1.8
作者：
HIRATA, H;HOSHIKAWA, K
通讯作者：
HOSHIKAWA, K
影响因子：
3.3
作者：
Nie, J. F.;Liu, Z. L.;Zhuang, Z.
通讯作者：
Zhuang, Z.