Grain refinement of 1 at.% Ta-containing cast TiAl-based alloy by cyclic air-cooling heat treatment

Keren Zhang; Rui Hu; Jinguang Li; Jieren Yang; Zitong Gao

doi:10.1016/j.matlet.2020.127940

Grain refinement of 1 at.% Ta-containing cast TiAl-based alloy by cyclic air-cooling heat treatment

Keren Zhang, Rui Hu, Jinguang Li, Jieren Yang, Zitong Gao

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

26 Scopus citations

Abstract

The refinement of fully lamellar (FL) microstructure from ∼400 μm to ∼40 μm of as-cast Ti-48Al-3Nb-1Ta (at.%) alloy is successfully achieved by cyclic air-cooling heat treatment. The refinement mechanism is analyzed that the precipitation of Widmanstätten and Feathery-like structures originating with several orientations is promoted by Ta during air-cooling, which on next heat treatment cycle transforms to small lamellar colonies. After five cycles, the coarse FL microstructure is completely divided to small lamellar colonies. Room-temperature mechanical tests revealed that with the refinement, the ductility and strength are greatly improved compared with those of coarse FL microstructure.

Original language	English
Article number	127940
Journal	Materials Letters
Volume	274
DOIs	https://doi.org/10.1016/j.matlet.2020.127940
State	Published - 1 Sep 2020

Keywords

Feathery-like structures
Intermetallic alloys and compounds
Microstructure
Refinement
Widmanstätten structures

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10.1016/j.matlet.2020.127940

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title = "Grain refinement of 1 at.% Ta-containing cast TiAl-based alloy by cyclic air-cooling heat treatment",

abstract = "The refinement of fully lamellar (FL) microstructure from ∼400 μm to ∼40 μm of as-cast Ti-48Al-3Nb-1Ta (at.%) alloy is successfully achieved by cyclic air-cooling heat treatment. The refinement mechanism is analyzed that the precipitation of Widmanst{\"a}tten and Feathery-like structures originating with several orientations is promoted by Ta during air-cooling, which on next heat treatment cycle transforms to small lamellar colonies. After five cycles, the coarse FL microstructure is completely divided to small lamellar colonies. Room-temperature mechanical tests revealed that with the refinement, the ductility and strength are greatly improved compared with those of coarse FL microstructure.",

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T1 - Grain refinement of 1 at.% Ta-containing cast TiAl-based alloy by cyclic air-cooling heat treatment

AU - Zhang, Keren

AU - Hu, Rui

AU - Li, Jinguang

AU - Yang, Jieren

AU - Gao, Zitong

PY - 2020/9/1

Y1 - 2020/9/1

N2 - The refinement of fully lamellar (FL) microstructure from ∼400 μm to ∼40 μm of as-cast Ti-48Al-3Nb-1Ta (at.%) alloy is successfully achieved by cyclic air-cooling heat treatment. The refinement mechanism is analyzed that the precipitation of Widmanstätten and Feathery-like structures originating with several orientations is promoted by Ta during air-cooling, which on next heat treatment cycle transforms to small lamellar colonies. After five cycles, the coarse FL microstructure is completely divided to small lamellar colonies. Room-temperature mechanical tests revealed that with the refinement, the ductility and strength are greatly improved compared with those of coarse FL microstructure.

AB - The refinement of fully lamellar (FL) microstructure from ∼400 μm to ∼40 μm of as-cast Ti-48Al-3Nb-1Ta (at.%) alloy is successfully achieved by cyclic air-cooling heat treatment. The refinement mechanism is analyzed that the precipitation of Widmanstätten and Feathery-like structures originating with several orientations is promoted by Ta during air-cooling, which on next heat treatment cycle transforms to small lamellar colonies. After five cycles, the coarse FL microstructure is completely divided to small lamellar colonies. Room-temperature mechanical tests revealed that with the refinement, the ductility and strength are greatly improved compared with those of coarse FL microstructure.

KW - Feathery-like structures

KW - Intermetallic alloys and compounds

KW - Microstructure

KW - Refinement

KW - Widmanstätten structures

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DO - 10.1016/j.matlet.2020.127940

M3 - 文章

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SN - 0167-577X

VL - 274

JO - Materials Letters

JF - Materials Letters

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Grain refinement of 1 at.% Ta-containing cast TiAl-based alloy by cyclic air-cooling heat treatment

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Keywords

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