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

材料学院

Northwestern Polytechnical University Xian

科研成果: 期刊稿件 › 文章 › 同行评审

34 引用（Scopus）

摘要

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.

源语言	英语
文章编号	127940
期刊	Materials Letters
卷	274
DOI	https://doi.org/10.1016/j.matlet.2020.127940
出版状态	已出版 - 1 9月 2020

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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.",

keywords = "Feathery-like structures, Intermetallic alloys and compounds, Microstructure, Refinement, Widmanst{\"a}tten structures",

author = "Keren Zhang and Rui Hu and Jinguang Li and Jieren Yang and Zitong Gao",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2020",

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doi = "10.1016/j.matlet.2020.127940",

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TY - JOUR

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

UR - https://www.scopus.com/pages/publications/85084946266

U2 - 10.1016/j.matlet.2020.127940

DO - 10.1016/j.matlet.2020.127940

M3 - 文章

AN - SCOPUS:85084946266

SN - 0167-577X

VL - 274

JO - Materials Letters

JF - Materials Letters

M1 - 127940

ER -

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

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