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
N1 - Publisher Copyright:
© 2022 Chinese Materials Research Society
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 - http://www.scopus.com/inward/record.url?scp=85127011545&partnerID=8YFLogxK
U2 - 10.1016/j.pnsc.2022.03.004
DO - 10.1016/j.pnsc.2022.03.004
M3 - Article
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 -