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

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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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    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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[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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History
  • Received:November 12,2019
  • Revised:December 19,2019
  • Adopted:January 03,2020
  • Online: November 04,2020
  • Published: