Precipitation of two kinds of γ laths in massive γ coexisting with γ lamellae in as-cast Ta-containing TiAl-Nb alloys

Keren Zhang; Rui Hu; Xuyang Wang; Jieren Yang

doi:10.1016/j.matlet.2016.09.046

Precipitation of two kinds of γ laths in massive γ coexisting with γ lamellae in as-cast Ta-containing TiAl-Nb alloys

Keren Zhang
, Rui Hu
, Xuyang Wang
, Jieren Yang

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

9 Scopus citations

Abstract

The relationship between γ_m phase (diffusionless transformation) and γ lamellae (diffusion transformation) and the precipitation of γ laths in γ_m were experimentally characterized in a Ta-containing as-cast TiAl-Nb alloy. Unlike the irregular and curved boundary of γ_m obtained by completely diffusionless transformation, γ_m phase formed in this work presents a particular orientation relationship with γ lamellae which is confirmed to be 120° rotational relationship. It indicates that γ lamellae can grow through the existed γ_m phase due to diffusion-controlled growth. Meanwhile, two kinds of γ laths shown true-twin and pseudo-twin relationship with γ_m respectively can be found, which can relax the stress in γ_m phase. The precipitation mechanisms of these laths are discussed.

Original language	English
Pages (from-to)	480-483
Number of pages	4
Journal	Materials Letters
Volume	185
DOIs	https://doi.org/10.1016/j.matlet.2016.09.046
State	Published - 15 Dec 2016

Keywords

Intermetallic alloys and compounds
Microstructure
Ta elements
Twin
γ phase

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10.1016/j.matlet.2016.09.046

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title = "Precipitation of two kinds of γ laths in massive γ coexisting with γ lamellae in as-cast Ta-containing TiAl-Nb alloys",

abstract = "The relationship between γm phase (diffusionless transformation) and γ lamellae (diffusion transformation) and the precipitation of γ laths in γm were experimentally characterized in a Ta-containing as-cast TiAl-Nb alloy. Unlike the irregular and curved boundary of γm obtained by completely diffusionless transformation, γm phase formed in this work presents a particular orientation relationship with γ lamellae which is confirmed to be 120° rotational relationship. It indicates that γ lamellae can grow through the existed γm phase due to diffusion-controlled growth. Meanwhile, two kinds of γ laths shown true-twin and pseudo-twin relationship with γm respectively can be found, which can relax the stress in γm phase. The precipitation mechanisms of these laths are discussed.",

keywords = "Intermetallic alloys and compounds, Microstructure, Ta elements, Twin, γ phase",

author = "Keren Zhang and Rui Hu and Xuyang Wang and Jieren Yang",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2016",

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doi = "10.1016/j.matlet.2016.09.046",

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TY - JOUR

T1 - Precipitation of two kinds of γ laths in massive γ coexisting with γ lamellae in as-cast Ta-containing TiAl-Nb alloys

AU - Zhang, Keren

AU - Hu, Rui

AU - Wang, Xuyang

AU - Yang, Jieren

PY - 2016/12/15

Y1 - 2016/12/15

N2 - The relationship between γm phase (diffusionless transformation) and γ lamellae (diffusion transformation) and the precipitation of γ laths in γm were experimentally characterized in a Ta-containing as-cast TiAl-Nb alloy. Unlike the irregular and curved boundary of γm obtained by completely diffusionless transformation, γm phase formed in this work presents a particular orientation relationship with γ lamellae which is confirmed to be 120° rotational relationship. It indicates that γ lamellae can grow through the existed γm phase due to diffusion-controlled growth. Meanwhile, two kinds of γ laths shown true-twin and pseudo-twin relationship with γm respectively can be found, which can relax the stress in γm phase. The precipitation mechanisms of these laths are discussed.

AB - The relationship between γm phase (diffusionless transformation) and γ lamellae (diffusion transformation) and the precipitation of γ laths in γm were experimentally characterized in a Ta-containing as-cast TiAl-Nb alloy. Unlike the irregular and curved boundary of γm obtained by completely diffusionless transformation, γm phase formed in this work presents a particular orientation relationship with γ lamellae which is confirmed to be 120° rotational relationship. It indicates that γ lamellae can grow through the existed γm phase due to diffusion-controlled growth. Meanwhile, two kinds of γ laths shown true-twin and pseudo-twin relationship with γm respectively can be found, which can relax the stress in γm phase. The precipitation mechanisms of these laths are discussed.

KW - Intermetallic alloys and compounds

KW - Microstructure

KW - Ta elements

KW - Twin

KW - γ phase

UR - https://www.scopus.com/pages/publications/84988458320

U2 - 10.1016/j.matlet.2016.09.046

DO - 10.1016/j.matlet.2016.09.046

M3 - 文章

AN - SCOPUS:84988458320

SN - 0167-577X

VL - 185

SP - 480

EP - 483

JO - Materials Letters

JF - Materials Letters

ER -

Precipitation of two kinds of γ laths in massive γ coexisting with γ lamellae in as-cast Ta-containing TiAl-Nb alloys

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Keywords

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