Microstructures and mechanical properties of Co3(Al,W) with the LI2 structure

Takashi Oohashi; Norihiko L. Okamoto; Kyosuke Kishida; Katsushi Tanaka; Haruyuki Inui

Microstructures and mechanical properties of Co₃(Al,W) with the LI₂ structure

Takashi Oohashi, Norihiko L. Okamoto, Kyosuke Kishida, Katsushi Tanaka, Haruyuki Inui

Research output: Contribution to journal › Conference article › peer-review

Abstract

Microstructures and deformation behavior of γ/γ' Co-Al-W single-crystals and γ'-Co₃(Al,W) polycrystals have been investigated. Single crystals with the γ/γ' two-phase microstructure with a large volume fraction of the γ' phase are obtained by the Bridgman method. These single crystals exhibit anomalies in yield stress in compression at temperatures above 700 °C. Polycrystalline Co₃(Al,W) alloys can be rolled in ambient atmosphere such that the nominal thickness was reduced by 40%. The values of tensile elongation obtained for the polycrystalline Co₃(Al,W) alloys in air is slightly smaller than that obtained in vacuum, indicating that the Co₃(Al,W) alloys are not severely susceptible to the environmental embrittlement in air.

Original language	English
Pages (from-to)	221-226
Number of pages	6
Journal	Materials Research Society Symposium Proceedings
Volume	1128
Publication status	Published - 2009 Nov 17
Externally published	Yes
Event	2008 MRS Fall Meeting - Boston, MA, United States Duration: 2008 Dec 2 → 2008 Dec 5

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

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title = "Microstructures and mechanical properties of Co3(Al,W) with the LI2 structure",

abstract = "Microstructures and deformation behavior of γ/γ' Co-Al-W single-crystals and γ'-Co3(Al,W) polycrystals have been investigated. Single crystals with the γ/γ' two-phase microstructure with a large volume fraction of the γ' phase are obtained by the Bridgman method. These single crystals exhibit anomalies in yield stress in compression at temperatures above 700 °C. Polycrystalline Co3(Al,W) alloys can be rolled in ambient atmosphere such that the nominal thickness was reduced by 40%. The values of tensile elongation obtained for the polycrystalline Co3(Al,W) alloys in air is slightly smaller than that obtained in vacuum, indicating that the Co3(Al,W) alloys are not severely susceptible to the environmental embrittlement in air.",

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T1 - Microstructures and mechanical properties of Co3(Al,W) with the LI2 structure

AU - Oohashi, Takashi

AU - Okamoto, Norihiko L.

AU - Kishida, Kyosuke

AU - Tanaka, Katsushi

AU - Inui, Haruyuki

PY - 2009/11/17

Y1 - 2009/11/17

N2 - Microstructures and deformation behavior of γ/γ' Co-Al-W single-crystals and γ'-Co3(Al,W) polycrystals have been investigated. Single crystals with the γ/γ' two-phase microstructure with a large volume fraction of the γ' phase are obtained by the Bridgman method. These single crystals exhibit anomalies in yield stress in compression at temperatures above 700 °C. Polycrystalline Co3(Al,W) alloys can be rolled in ambient atmosphere such that the nominal thickness was reduced by 40%. The values of tensile elongation obtained for the polycrystalline Co3(Al,W) alloys in air is slightly smaller than that obtained in vacuum, indicating that the Co3(Al,W) alloys are not severely susceptible to the environmental embrittlement in air.

AB - Microstructures and deformation behavior of γ/γ' Co-Al-W single-crystals and γ'-Co3(Al,W) polycrystals have been investigated. Single crystals with the γ/γ' two-phase microstructure with a large volume fraction of the γ' phase are obtained by the Bridgman method. These single crystals exhibit anomalies in yield stress in compression at temperatures above 700 °C. Polycrystalline Co3(Al,W) alloys can be rolled in ambient atmosphere such that the nominal thickness was reduced by 40%. The values of tensile elongation obtained for the polycrystalline Co3(Al,W) alloys in air is slightly smaller than that obtained in vacuum, indicating that the Co3(Al,W) alloys are not severely susceptible to the environmental embrittlement in air.

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T2 - 2008 MRS Fall Meeting

Y2 - 2 December 2008 through 5 December 2008

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Microstructures and mechanical properties of Co₃(Al,W) with the LI₂ structure

Abstract

ASJC Scopus subject areas

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