Creep-Induced Phase Instability and Microstructure Evolution of a Nearly Lamellar Ti-45Al-8.5Nb-(W, B, Y) Alloy

doi:10.1007/s40195-020-01108-x

金属学报英文版 ›› 2020, Vol. 33 ›› Issue (12): 1591-1600.DOI: 10.1007/s40195-020-01108-x

• • 下一篇

收稿日期:2020-03-16 修回日期:2020-04-24 接受日期:2020-05-15 出版日期:2020-12-10 发布日期:2020-12-11

Creep-Induced Phase Instability and Microstructure Evolution of a Nearly Lamellar Ti-45Al-8.5Nb-(W, B, Y) Alloy

Xuyang Wang¹, Jieren Yang¹^,²(), Rui Hu¹^,², Zitong Gao¹, Jinguang Li¹, Hengzhi Fu¹

¹State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China
²Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment, Northwestern Polytechnical University, Xi’an, 710072, China

Received:2020-03-16 Revised:2020-04-24 Accepted:2020-05-15 Online:2020-12-10 Published:2020-12-11
Contact: Jieren Yang

摘要/Abstract

Abstract:

Microstructure degradation and stress-induced transformation of a high Nb-containing TiAl alloy with nearly lamellar microstructure during creep were investigated. Tensile creep experiments were performed at 800, 850 and 900 °C under 150 MPa in air. Microstructures before and after creep tests were examined using scanning and transmission electron microscopy (SEM and TEM). Dislocations within the lamellar structure and β_o(ω) region and twin intersection in massive γ grains were investigated. Dislocation sliding played a critical role in the deformation of ω_o phase, which preferentially occurred on the (0002)ω_o plane. Possible deformation mechanisms were revealed. A stress-induced γ→α₂ phase transformation took place during the creep test at 850 and 900 °C. α₂ lamella could directly decompose into the ω_o phase at 850 °C. The instability of high-temperature microstructure can weaken the creep resistance and promote the plastic deformation of the lamellar matrix, thus could be detrimental to the creep properties. The correlations between creep properties and microstructure instability were discussed.

Key words: TiAl based alloy, Creep, Microstructural stability, Transmission electron microscopy (TEM)

. [J]. 金属学报英文版, 2020, 33(12): 1591-1600.

Xuyang Wang, Jieren Yang, Rui Hu, Zitong Gao, Jinguang Li, Hengzhi Fu. Creep-Induced Phase Instability and Microstructure Evolution of a Nearly Lamellar Ti-45Al-8.5Nb-(W, B, Y) Alloy[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(12): 1591-1600.

图/表 9

Fig. 1 Schematic of the creep samples used in this study

Fig. 2 a SEM-BSE image of the as-cast Ti-45Al-8.5Nb-0.2 W-0.2B-0.02Y alloy, b TEM bright-field image of the lamellar structureFull size image

Fig. 3 Typical creep curve (strain-time) at 800, 850 and 900 °C at 150 Mpa

Fig. 4 Microstructure after creep test at 800 °C: a) SEM-BSE image; b, c bright-field TEM images of the lamellar structure; d bright-field TEM image of γ grain located at the lamellar colony boundaries

Fig. 5 a TEM image of the deformation structure after creep test at 800 °C; b magnified image of the twin intersection; c high-resolution transmission electron microscope (HRTEM) of the twin intersection recorded along the common<011]γ zone axis of twins Ti and Tb; d inverse transformation (IFFT) of the red box in c

Fig. 6 a TEM image of βo(ω) region; b HRTEM recorded along the [110]βo zone axis in βo(ω) region of the area I in a; c IFFT of area II in b, which only shows the (0002) plane

Fig. 7 Microstructures after creep test at 850 °C: a SEM-BSE image; b bright-field TEM image of the lamellar structure

Fig. 8 a HAADF image of the lamellar structure; b bright-field TEM image of α2 lath, indicating that the βo(ω) phase precipitated during the creep process; c HRTEM recorded along the $\left[ { 1 1 {\bar{\text{2}}\text{0}}} \right]\alpha_{2}$ zone axis at the boundary between α2 and βo(ω) phases in b; d corresponding FFT of c

Fig. 9 Microstructures after creep test at 900 °C: a SEM-BSE image; b bright-field TEM image of the lamellar structure; c TEM image of the βo(ω) region; d SADP of the βo(ω) region in c

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Creep-Induced Phase Instability and Microstructure Evolution of a Nearly Lamellar Ti-45Al-8.5Nb-(W, B, Y) Alloy

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