Thermal Stability of Microstructures in Low-Density Ti2AlNb-Based Alloy Hot Rolled Plate
Received date: 2021-07-30
Revised date: 2022-05-09
Online published: 2022-08-23
Supported by
National Key Research and Development Program of China(2018YFB0704100);National Natural Science Foundation of China(51871168);Southwest Technology and Engineering Research Institute Cooperation Fund(HDHDW5902020102)
Multielement and multiphase intermetallic alloys based on an ordered orthorhombic (O) phase Ti2AlNb, where the presence of a long-range order superlattice structure effectively impedes the movement of dislocations and high-temperature diffusion, are a class of highly promising lightweight high-temperature structural materials for aerospace applications due to their high specific strength and superior fracture toughness. Thermal stability of microstructures in the hot rolled sheet of a low-density Ti2AlNb-based alloy has been investigated in a temperature range from 600oC to 1100oC for 12 h via OM, SEM, XRD, and TEM/STEM. The results showed that the initial Ti2AlNb-based alloy hot rolled sheet consisted of α2, B2, and O phases. Furthermore, the Ti2AlNb-based alloy hot rolled sheet at 600oC for 12 h consisted of α2, B2, and O phases, where the particle shaped α2 phase was distributed in the B2 matrix, and lath-like O phase lay inbetween the α2 particles. The spheroidization of the α2 phase started to occur along with the coarsening and solutionizing of the lath O phase in the B2 matrix at a temperature between 800oC and 900oC for 12 h, while the hot rolled Ti2AlNb-based alloy plate was still composed of α2, B2, and O phases. When the temperature reached 950oC, the O phase disappeared in the B2 matrix. Only α2 + B2 two phases were present in the hot rolled Ti2AlNb-based alloy at 950-1000oC for 12 h, where the α2 phase was spheroidized and tended to distribute surrounding B2 grain boundaries. When the temperature rose to 1100oC, the alloy contained a B2 single phase with only some residual α2 phase. Moreover, the Vickers microhardness contour vs temperature plot revealed that a peak hardness of as high as 509 HV appeared at 600oC due to the presence of numerous fine O laths.
FENG Aihan , CHEN Qiang , WANG Jian , WANG Hao , QU Shoujiang , CHEN Daolun . Thermal Stability of Microstructures in Low-Density Ti2AlNb-Based Alloy Hot Rolled Plate[J]. Acta Metall Sin, 2023 , 59(6) : 777 -786 . DOI: 10.11900/0412.1961.2021.00315
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