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Adaptive Volume Control in Titanium Alloy for High Temperature Performance

1
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
2
Center of Microstructure Science, Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
3
Applied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology, SE-10044 Stockholm, Sweden
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(23), 3950; https://doi.org/10.3390/ma12233950
Received: 21 October 2019 / Revised: 25 November 2019 / Accepted: 26 November 2019 / Published: 28 November 2019
(This article belongs to the Section Smart Materials)
With the increase of time, the shrinkage of materials at fixed temperature could enhance the failure of fasteners. We report a potential way to alter the volume/length of alloy automatically through isothermal aging due to pseudospinodal decomposition mechanism. The volume of Ti-10V-2Fe-3Al alloy first shrunk and then expanded during isothermal aging at 550 °C. It can fit tightly and make up for volume loss. Transmission electron microscopy observation exhibits no obvious coarsening of intragranular α phase with the increasing time. However, composition evolution with time shows a gradual change through energy dispersive spectrometer analysis. The result shows that β stabilizers, V and Fe, are prone to diffuse to the β matrix, while α stabilizers, Al, prefer to segregate to the α phase. First principle calculations suggest that the structure transition for β to α cause the first decrease of volume, and the diffusion of V, Fe and Al is the origin of the later abnormal increase of volume. View Full-Text
Keywords: Ti-1023 alloy; adaptive volume; isothermal; high temperature performance Ti-1023 alloy; adaptive volume; isothermal; high temperature performance
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MDPI and ACS Style

Li, P.; Sun, X.; Zhang, T.; Zhang, H.; Wang, D.; Sun, Q.; Xiao, L.; Sun, J. Adaptive Volume Control in Titanium Alloy for High Temperature Performance. Materials 2019, 12, 3950.

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