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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(英文),2020,49(10):3620~3626.[Fang Xiao,Yang Jieren,Liu Yi,Wen Ming and 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.]
Effects of Ta on Microstructure and Mechanical Properties of Novel γ+γ' Two-Phase Ir-Based Superalloys
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Received:November 12, 2019  Revised:December 19, 2019
DOI:
Key words: Ir-based superalloys  γ'-Ir3(Al,W) phase  microstructure  solid-solution strengthening  mechanical properties
Foundation item: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)
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Fang Xiao,Yang Jieren,Liu Yi,Wen Ming and Hu Rui  
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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.