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Ta元素对新型γ+γ'双相Ir基高温合金显微组织和力学性能的影响
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1.凝固技术国家重点实验室 西北工业大学;2.稀贵金属综合利用新技术国家重点实验室 昆明贵金属研究所

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稀贵金属综合利用新技术国家重点实验室开放课题资助(项目号SKL-SPM-2018010);国家重点研发计划项目(项目号2017YFB0305500)


Effects of Ta on Microstructure and Mechanical Properties of Novel γ+γ' Two-Phase Ir-Based Superalloys
Author:
Affiliation:

1.State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an;2.State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,Kunming Institute of Precious Metals

Fund Project:

The State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals: SKL-SPM-2018010;The National Key Technologies R&D Program of China: 2017YFB0305500

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    摘要:

    Ir-13W-6Al(at.%)合金是一种由γ'-Ir3(Al,W)相强化型铱基超高温合金,在航空航天极端环境下展现出良好的应用前景。本文在Ir-13W-6Al三元合金基础上,分别添加2,5和8 at.%的Ta元素,研究其对γ+γ'双相铱基合金显微组织结构、γ'强化相数量、析出相形貌、高低温力学性能以及压缩断裂特征的影响。结果表明:γ'相的体积分数随着Ta含量增加而增大;添加Ta元素后合金的维氏硬度以及纳米硬度均高于三元Ir-13W-6Al合金;1300 ℃下合金抗压强度随Ta含量的增多而提高,强度的提高可归因于γ'-Ir3(Al,W)强化相的析出和Ta元素的固溶强化作用。Ta元素的添加有效地改善了Ir-13W-6Al三元合金体系的室温、高温力学性能,为发展超耐温高性能γ+γ'双相铱基合金的成分设计和结构优化提供了实验基础和理论依据。

    Abstract:

    γ'-Ir3(Al,W) phase-strengthed Ir-13W-6Al(at.%) Superalloys exhibit promising applications for aerospace industry. An experimental set-up was based on Ir-13W-6Al ternary superalloy and 2, 5, 8 at.% Ta elements were added. In order to research the effect of Ta, the microstructure evolution, the amount of γ' strengthening phase, the precipitation behavior, room-/high- temperature mechanical properties and fracture characteristics of γ+γ' two-phase Ir-based superalloys were investigated. The results show that with Ta content increasing, the volume fraction of γ'strengthening phase increases and the vickers hardness/nano-hardness are higher than the Ir-13W-6Al ternary superalloy. The addition of Ta improves the high-temperature mechanical properties of Ir-13W-6Al superalloys at 1300 ℃, and the increased compressive strength can be attributed to the precipitation of γ'-Ir3(Al,W) phase and solid-solution strengthening. Ta effectively improves the room- and high-temperature properties of Ir-13W-6Al superalloys. This study provides experimental and theoretical guide for the development of novel γ+γ' two-phase Ir-based superalloys.

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方晓,杨劼人,刘毅,闻明,胡锐. Ta元素对新型γ+γ'双相Ir基高温合金显微组织和力学性能的影响[J].稀有金属材料与工程,2020,49(10):3620~3626.[Fang Xiao, Yang Jieren, Liu Yi, Wen Ming, Hu Rui. Effects of Ta on Microstructure and Mechanical Properties of Novel γ+γ' Two-Phase Ir-Based Superalloys[J]. Rare Metal Materials and Engineering,2020,49(10):3620~3626.]
DOI:10.12442/j. issn.1002-185X.20190947

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  • 收稿日期:2019-11-12
  • 最后修改日期:2019-12-19
  • 录用日期:2020-01-03
  • 在线发布日期: 2020-11-04
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