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镍基高温合金长时效下两相分离行为研究
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四川大学空天科学与工程学院,四川大学空天科学与工程学院,重庆大学材料科学与工程学院,重庆大学材料科学与工程学院

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TB3

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国家自然科学基金项目(面上项目,重点项目,重大项目);中央高校基本科研业务费资助


Study on Phase Separation of a Ni-based Superalloy after Long-time Aging
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National Natural Science Foundation of China (51374056, 51474061, 51404055); Hundreds of Outstanding Innovative Talents in Higher Education Institutions of Hebei Province (II) (BR2-127); Natural Science Foundation of Hebei Province (E2013501135, E2014501143, 2014501010); New Century Excellent Talents in University (NCET-10-0304); Basic Scientific Research of Central Colleges, Northeastern University (N100123003, N120523001); The Key Technologies R & D Program of Qinhuangdao of Hebei Province (201402B005); The Youth Foundation of Hebei Educational Committee (QN2014325)

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    摘要:

    采用原子探针仪器LEAP 4000X Si,研究镍基高温合金Ni-Al-Cr-W-Re-Ru长期时效后的元素分布规律。结果表明,Ni、Cr和Re原子在无序γ(FCC)-基体相中富集,而Al和W原子更多分配到有序γ"(L12)-析出相。在γ/γ"相界面γ相一侧出现Ni原子局部富集,导致界面自由能降低。γ"相中,溶质元素原子浓度总和约25 at.%,实验局部Al-R(R=Re、Ru或W)RDF在第1最近邻距离处负相关,说明Re、Ru和W优先占据Ni3Al(L12)结构的Al位。和三元合金Ni-Al-Cr相比,添加W、Re和Ru后,合金的γ相得到固溶强化,γ"相体积分数提高,硬度增加。

    Abstract:

    Distribution of alloying elements of a Ni-based superalloy after long-time aging is studied employing LEAP 4000X Si. Elements like Ni, Cr and Re preferentially partition to the γ phase, while Al and W have a preference for γ" phase. A local accumulation of Ni is found on the matrix side at the γ/γ" interface, leading to a reduction of interfacial free energy. The sum solute elemental concentrations of ~25 at.% and the experimental partial RDFs of Al-R (R=Re, Ru or W) exhibiting negative correlation at first-NN distances in precipitates indicate that refractory elements substitute preferentially to the Al sublattice sites. The solid-solution strengthening effect of refractory elements and the increase in precipitates volume fraction result in an increase in microhardness, compared to the base Ni-Al-Cr alloy.

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黄彦彦,周青华,刘青,蔡聪德.镍基高温合金长时效下两相分离行为研究[J].稀有金属材料与工程,2018,47(1):261~266.[HUANG YANYAN, ZHOU QINGHUA, LIU QING, CAI CONGDE. Study on Phase Separation of a Ni-based Superalloy after Long-time Aging[J]. Rare Metal Materials and Engineering,2018,47(1):261~266.]
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历史
  • 收稿日期:2015-11-27
  • 最后修改日期:2016-05-13
  • 录用日期:2016-05-18
  • 在线发布日期: 2018-02-07
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