Creep behaviors of an Ir-23Nb alloy at ultra-high temperatures

Y. F. Gu; Y. Yamabe-Mitarai; S. Nakazawa; H. Harada

doi:10.1007/s11661-003-0285-8

Creep behaviors of an Ir-23Nb alloy at ultra-high temperatures

Y. F. Gu, Y. Yamabe-Mitarai, S. Nakazawa, H. Harada

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

5 Citations (Scopus)

Abstract

The ultra-high-temperature creep behaviors of an Ir-base, Ir-23Nb (in at. pct), two-phase refractory superalloy have been investigated. The compression creep experiments were performed at tempera- tures from 1650°C to 1800°C at initial applied stresses from 49 to 200 MPa. The results show that Ir-23Nb alloy has higher creep resistance and longer creep life in comparison to Ir-17Nb alloy under the same experimental conditions. The steady-state creep behavior can be described in terms of power-law creep with the apparent stress exponent of 4.5 and apparent activation energy of 653 kJ/mol. Basing on the investigation, the possible reasons for the great improvement on the creep resistance and creep life in Ir-23Nb alloy are discussed.

Original language	English
Pages (from-to)	2217-2221
Number of pages	5
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	34 A
Issue number	10
DOIs	https://doi.org/10.1007/s11661-003-0285-8
Publication status	Published - 2003 Oct
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys

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10.1007/s11661-003-0285-8

Cite this

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abstract = "The ultra-high-temperature creep behaviors of an Ir-base, Ir-23Nb (in at. pct), two-phase refractory superalloy have been investigated. The compression creep experiments were performed at tempera- tures from 1650°C to 1800°C at initial applied stresses from 49 to 200 MPa. The results show that Ir-23Nb alloy has higher creep resistance and longer creep life in comparison to Ir-17Nb alloy under the same experimental conditions. The steady-state creep behavior can be described in terms of power-law creep with the apparent stress exponent of 4.5 and apparent activation energy of 653 kJ/mol. Basing on the investigation, the possible reasons for the great improvement on the creep resistance and creep life in Ir-23Nb alloy are discussed.",

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AU - Gu, Y. F.

AU - Yamabe-Mitarai, Y.

AU - Nakazawa, S.

AU - Harada, H.

PY - 2003/10

Y1 - 2003/10

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AB - The ultra-high-temperature creep behaviors of an Ir-base, Ir-23Nb (in at. pct), two-phase refractory superalloy have been investigated. The compression creep experiments were performed at tempera- tures from 1650°C to 1800°C at initial applied stresses from 49 to 200 MPa. The results show that Ir-23Nb alloy has higher creep resistance and longer creep life in comparison to Ir-17Nb alloy under the same experimental conditions. The steady-state creep behavior can be described in terms of power-law creep with the apparent stress exponent of 4.5 and apparent activation energy of 653 kJ/mol. Basing on the investigation, the possible reasons for the great improvement on the creep resistance and creep life in Ir-23Nb alloy are discussed.

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Creep behaviors of an Ir-23Nb alloy at ultra-high temperatures

Abstract

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