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Open AccessArticle

Microstructure Evolution and Mechanical Properties of Novel γ/γ′ Two-Phase Strengthened Ir-Based Superalloys

by Xiao Fang 1, Rui Hu 1, Jieren Yang 1,2,*, Yi Liu 3 and Ming Wen 3
1
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an 710072, China
2
Shanxi Key Laboratory of High-Performance Precision Froming Technology and Equipment, Northwestern Polytechnical University, Xi′an 710072, China
3
Kunming Institute of Precious Metals, Kunming 650106, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1171; https://doi.org/10.3390/met9111171
Received: 28 September 2019 / Revised: 21 October 2019 / Accepted: 23 October 2019 / Published: 30 October 2019
Ir-based superalloys are irreplaceable in some specific harsh conditions regardless of their cost and high density. In order to develop a new class of Ir-based superalloy for future ultrahigh-temperature applications, the microstructure evolution, phase relationships, and mechanical properties of Ir–Al–W–Ta alloys with γ/γ′ two-phase structure were investigated. Room- and high-temperature compressions at 1300 °C, and room-temperature nanoindentation for the Ta-containing Ir–6Al–13W alloys were conducted. The results show that the addition of Ta can significantly improve the high-temperature mechanical properties, but does not change the fracture mode of the Ir-based two-phase superalloys. The compressive strength of quaternary alloys can be attributed to the precipitation of γ′-Ir3(Al, W) phase and solid solution strengthening. The microstructure and mechanical properties of Ir–Al–W–Ta quaternary alloys exhibit promising characteristics for the development of high-temperature materials. View Full-Text
Keywords: Ir-based alloys; ultrahigh-temperature; γ/γ′ two-phase; solution strengthening; mechanical properties Ir-based alloys; ultrahigh-temperature; γ/γ′ two-phase; solution strengthening; mechanical properties
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MDPI and ACS Style

Fang, X.; Hu, R.; Yang, J.; Liu, Y.; Wen, M. Microstructure Evolution and Mechanical Properties of Novel γ/γ′ Two-Phase Strengthened Ir-Based Superalloys. Metals 2019, 9, 1171.

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