Advanced creep life in a Ni-based superalloy through γ' phase shape optimization with varying Al content

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-05 DOI:10.1016/j.matchar.2025.115009

Kaixuan Cheng , Shengwei Lv , Weidong Xuan , Yiwei Wang , Yuyang Hou , Baojun Wang , Zhongming Ren

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Abstract

Advanced creep life at 1100 °C/140 MPa was obtained in a nickel-based single crystal superalloys (Ni-SX alloys) by varying the Al content. The lattice distortion phenomenon and γ' phase shape induced by Al content matters with systematic investigation. Novel results demonstrated that the γ' phase shape transitioned from nearly spherical to square, while the creep life increased from 2 h to 269.05 h with Al content increase from 4.5 to 5.7 wt%. Further increasing the Al content to 6.4 wt% enhanced the γ' phase content while reducing the creep rupture life to 132.08 h. Dense dislocation networks with irregularly arranged raft γ' structure were observed at γ/γ' phase interface. Diffraction patterns and high-resolution interface images revealed that the modulation of lattice constants by Al content further affects the lattice misfit and γ' phase shape, subsequently influencing the dislocation migration and creep performance.

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通过改变Al含量优化γ′相形状，提高ni基高温合金的蠕变寿命

通过改变Al含量，镍基单晶高温合金（Ni-SX合金）在1100℃/140 MPa下获得了较长的蠕变寿命。系统地研究了Al含量引起的晶格畸变现象和γ′相形状。结果表明，合金的γ′相由近球形转变为方形，蠕变寿命从2 h提高到269.05 h， Al含量从4.5 wt%提高到5.7 wt%。当Al含量进一步增加到6.4 wt%时，γ′相含量增加，但蠕变断裂寿命降低至132.08 h。在γ/γ′相界面处观察到密集的位错网络，并形成不规则排列的筏形γ′结构。衍射图和高分辨率界面图像显示，Al含量对晶格常数的调制进一步影响晶格失配和γ′相形状，从而影响位错迁移和蠕变性能。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.