In-situ study on γ phase transformation behaviour of γ-TiAl alloys at different cooling rates

Zhiping Li; Liangshun Luo; Yanqing Su; Binbin Wang; Liang Wang; Tong Liu; Mengjia Yao; Chen Liu; Jingjie Guo; Hengzhi Fu

doi:10.1016/j.pnsc.2022.03.004

In-situ study on γ phase transformation behaviour of γ-TiAl alloys at different cooling rates

Zhiping Li
, Liangshun Luo^*
, Yanqing Su^*
, Binbin Wang
, Liang Wang
, Tong Liu
, Mengjia Yao
, Chen Liu
, Jingjie Guo
, Hengzhi Fu

^*Corresponding author for this work

School of Physics

Harbin Institute of Technology
Anhui Polytechnic University

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

24 Scopus citations

Abstract

γ-TiAl-based alloys are promising lightweight high-temperature structural materials, and the transformation from the α parent phase to γ lamellae during the cooling process has a great influence on the microstructures and mechanical properties of TiAl alloys. In this paper, an in-situ observation technique, high-temperature laser scanning confocal microscopy (HTLSCM), was utilized to investigate the continuous cooling transition (CCT) from the α phase in three compositions. The nucleation and growth behaviors of γ lamellae were studied at several moderate cooling rates. In addition, the processes of helium gas quenching for three alloys were investigated, and the massive transformation was observed in Ti–49Al. CCT diagraphs were concluded for three alloys. The Vickers hardness of TiAl alloys subjected to different cooling rates was tested, and it was found that the hardness of alloys was enhanced with increasing cooling rate due to the refinement of lamellar spacing.

Original language	English
Pages (from-to)	345-357
Number of pages	13
Journal	Progress in Natural Science: Materials International
Volume	32
Issue number	3
DOIs	https://doi.org/10.1016/j.pnsc.2022.03.004
State	Published - Jun 2022

Keywords

High-temperature laser scanning confocal microscopy
Nucleation and growth
Phase transformation
TiAl based Alloys

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@article{feaf28f309c84edeb049606dcb7af553,

title = "In-situ study on γ phase transformation behaviour of γ-TiAl alloys at different cooling rates",

abstract = "γ-TiAl-based alloys are promising lightweight high-temperature structural materials, and the transformation from the α parent phase to γ lamellae during the cooling process has a great influence on the microstructures and mechanical properties of TiAl alloys. In this paper, an in-situ observation technique, high-temperature laser scanning confocal microscopy (HTLSCM), was utilized to investigate the continuous cooling transition (CCT) from the α phase in three compositions. The nucleation and growth behaviors of γ lamellae were studied at several moderate cooling rates. In addition, the processes of helium gas quenching for three alloys were investigated, and the massive transformation was observed in Ti{\textendash}49Al. CCT diagraphs were concluded for three alloys. The Vickers hardness of TiAl alloys subjected to different cooling rates was tested, and it was found that the hardness of alloys was enhanced with increasing cooling rate due to the refinement of lamellar spacing.",

keywords = "High-temperature laser scanning confocal microscopy, Nucleation and growth, Phase transformation, TiAl based Alloys",

author = "Zhiping Li and Liangshun Luo and Yanqing Su and Binbin Wang and Liang Wang and Tong Liu and Mengjia Yao and Chen Liu and Jingjie Guo and Hengzhi Fu",

note = "Publisher Copyright: {\textcopyright} 2022 Chinese Materials Research Society",

year = "2022",

month = jun,

doi = "10.1016/j.pnsc.2022.03.004",

language = "英语",

volume = "32",

pages = "345--357",

journal = "Progress in Natural Science: Materials International",

issn = "1002-0071",

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TY - JOUR

T1 - In-situ study on γ phase transformation behaviour of γ-TiAl alloys at different cooling rates

AU - Li, Zhiping

AU - Luo, Liangshun

AU - Su, Yanqing

AU - Wang, Binbin

AU - Wang, Liang

AU - Liu, Tong

AU - Yao, Mengjia

AU - Liu, Chen

AU - Guo, Jingjie

AU - Fu, Hengzhi

PY - 2022/6

Y1 - 2022/6

N2 - γ-TiAl-based alloys are promising lightweight high-temperature structural materials, and the transformation from the α parent phase to γ lamellae during the cooling process has a great influence on the microstructures and mechanical properties of TiAl alloys. In this paper, an in-situ observation technique, high-temperature laser scanning confocal microscopy (HTLSCM), was utilized to investigate the continuous cooling transition (CCT) from the α phase in three compositions. The nucleation and growth behaviors of γ lamellae were studied at several moderate cooling rates. In addition, the processes of helium gas quenching for three alloys were investigated, and the massive transformation was observed in Ti–49Al. CCT diagraphs were concluded for three alloys. The Vickers hardness of TiAl alloys subjected to different cooling rates was tested, and it was found that the hardness of alloys was enhanced with increasing cooling rate due to the refinement of lamellar spacing.

AB - γ-TiAl-based alloys are promising lightweight high-temperature structural materials, and the transformation from the α parent phase to γ lamellae during the cooling process has a great influence on the microstructures and mechanical properties of TiAl alloys. In this paper, an in-situ observation technique, high-temperature laser scanning confocal microscopy (HTLSCM), was utilized to investigate the continuous cooling transition (CCT) from the α phase in three compositions. The nucleation and growth behaviors of γ lamellae were studied at several moderate cooling rates. In addition, the processes of helium gas quenching for three alloys were investigated, and the massive transformation was observed in Ti–49Al. CCT diagraphs were concluded for three alloys. The Vickers hardness of TiAl alloys subjected to different cooling rates was tested, and it was found that the hardness of alloys was enhanced with increasing cooling rate due to the refinement of lamellar spacing.

KW - High-temperature laser scanning confocal microscopy

KW - Nucleation and growth

KW - Phase transformation

KW - TiAl based Alloys

UR - https://www.scopus.com/pages/publications/85127011545

U2 - 10.1016/j.pnsc.2022.03.004

DO - 10.1016/j.pnsc.2022.03.004

M3 - 文章

AN - SCOPUS:85127011545

SN - 1002-0071

VL - 32

SP - 345

EP - 357

JO - Progress in Natural Science: Materials International

JF - Progress in Natural Science: Materials International

IS - 3

ER -

In-situ study on γ phase transformation behaviour of γ-TiAl alloys at different cooling rates

Abstract

Keywords

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