Creep behavior of Ir-Nb and Ir-Zr refractory superalloys

Yamabe Mitarai Yoko; Nakazawa Shizuo; Harada Hiroshi

doi:10.1299/jsmea.45.2

Creep behavior of Ir-Nb and Ir-Zr refractory superalloys

Yamabe Mitarai Yoko, Nakazawa Shizuo, Harada Hiroshi

Integrated Research Division

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

The microstructure stability and creep properties of Ir-base refractory super-alloys (It-Nb and Ir-Zr) with an fcc and Ll ₂ two-phase structure were investigated. An orderly arrayed structure composed of cuboidal coherent Ll ₂ precipitates was observed in the Ir-Nb alloys. By a different heat treatment, a maze structure and a discontinuous coarsened lamellar structure were obtained in the Ir-Zr alloys. Creep behavior was investigated for samples with these three kinds of microstructure between 1 500 and 1 800°C. The creep behavior was explained according to microstructural changes before and after creep.

Original language	English
Pages (from-to)	2-7
Number of pages	6
Journal	JSME International Journal, Series A: Solid Mechanics and Material Engineering
Volume	45
Issue number	1
DOIs	https://doi.org/10.1299/jsmea.45.2
Publication status	Published - 2002 Jan

Keywords

Cuboidal precipitates
Lamellar structure
Maze structure
Precipitation hardening

ASJC Scopus subject areas

Materials Science(all)
Mechanical Engineering

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abstract = "The microstructure stability and creep properties of Ir-base refractory super-alloys (It-Nb and Ir-Zr) with an fcc and Ll 2 two-phase structure were investigated. An orderly arrayed structure composed of cuboidal coherent Ll 2 precipitates was observed in the Ir-Nb alloys. By a different heat treatment, a maze structure and a discontinuous coarsened lamellar structure were obtained in the Ir-Zr alloys. Creep behavior was investigated for samples with these three kinds of microstructure between 1 500 and 1 800°C. The creep behavior was explained according to microstructural changes before and after creep.",

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AU - Shizuo, Nakazawa

AU - Hiroshi, Harada

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N2 - The microstructure stability and creep properties of Ir-base refractory super-alloys (It-Nb and Ir-Zr) with an fcc and Ll 2 two-phase structure were investigated. An orderly arrayed structure composed of cuboidal coherent Ll 2 precipitates was observed in the Ir-Nb alloys. By a different heat treatment, a maze structure and a discontinuous coarsened lamellar structure were obtained in the Ir-Zr alloys. Creep behavior was investigated for samples with these three kinds of microstructure between 1 500 and 1 800°C. The creep behavior was explained according to microstructural changes before and after creep.

AB - The microstructure stability and creep properties of Ir-base refractory super-alloys (It-Nb and Ir-Zr) with an fcc and Ll 2 two-phase structure were investigated. An orderly arrayed structure composed of cuboidal coherent Ll 2 precipitates was observed in the Ir-Nb alloys. By a different heat treatment, a maze structure and a discontinuous coarsened lamellar structure were obtained in the Ir-Zr alloys. Creep behavior was investigated for samples with these three kinds of microstructure between 1 500 and 1 800°C. The creep behavior was explained according to microstructural changes before and after creep.

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KW - Lamellar structure

KW - Maze structure

KW - Precipitation hardening

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