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Open AccessArticle

Microstructure, Tensile, and Creep Behaviors of Ti-22Al-25Nb (at.%) Orthorhombic Alloy with Equiaxed Microstructure

1
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
2
School of Metallurgy Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
3
Beijing Iron & Steel Research Institute, Beijing 100081, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(7), 1244; https://doi.org/10.3390/ma11071244
Received: 6 May 2018 / Revised: 3 July 2018 / Accepted: 9 July 2018 / Published: 20 July 2018
This article investigates the tensile and creep behaviors of the Ti-22Al-25Nb (at.%) alloy with equiaxed microstructure. The experimental results show that the equiaxed microstructures are formed by isothermal forging in the α2 + B2 + O phase region, and then heat treating in α2 + B2 + O and B2 + O phase regions. The equiaxed particles are determined by isothermal forging and solution heat treating, and the acicular O phase is obtained by adjusting the aging temperature. The strengths of the alloy are sensitive to the thickness of the secondary acicular O phase. Increase in aging temperature improves strength and reduces the ductility. Deformation of the alloy mainly depends on the volume fraction and deformability of the B2 phase. During the high-temperature tensile deformation, the flow stress decreases with the increasing deformation temperature and increases with the increasing strain rate. The microstructure obtained by higher aging temperature (HT-840) has better creep resistance, due to the coarsening of the secondary acicular O phase. View Full-Text
Keywords: Ti2AlNb-based alloy; equiaxed microstructure; tensile deformation; creep behavior Ti2AlNb-based alloy; equiaxed microstructure; tensile deformation; creep behavior
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MDPI and ACS Style

Wang, W.; Zeng, W.; Sun, Y.; Zhou, H.; Liang, X. Microstructure, Tensile, and Creep Behaviors of Ti-22Al-25Nb (at.%) Orthorhombic Alloy with Equiaxed Microstructure. Materials 2018, 11, 1244.

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