Effect of α-Platelet Thickness on the Mechanical Properties of Ti-6Al-4V Alloy with Lamellar Microstructure

1st International Workshop on Materials Science and Mechanical Engineering

材料科学;机械制造

Ren, Y.^1 ; Zhou, S.M.^2 ; Xue, Z.Y.^1 ; Luo, W.B.^3 ; Ren, Y.J.^1 ; Zhang, Y.J.^1

School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing

102206, China^1

No. 52 Institute of China Ordnance Industries, Yantai, Shandong

264003, China^2

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing

100083, China^3

关键词: Beta transus;    Fracture strain;    Hall Petch relationship;    Lamellar microstructure;    Plate thickness;    Quasi-static;    Temperature conditions;    Ti-6Al-4V alloy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/281/1/012024/pdf
DOI  :  10.1088/1757-899X/281/1/012024

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this paper, lamellar microstructures with average α-platelet thicknesses ranging from 0.55 μm to 1.98 μm were obtained in Ti-6Al-4V (Ti64) alloy by solution-treated above β-transus temperature and followed cooling through different methods. Then effects of the average thickness of plate-like α phase on the mechanical properties of this alloy were investigated. The results show that the yield stress and/or the flow stress of Ti64 decrease with increased average α-platelet thickness during compression under various strain-rate and temperature conditions. Conversely, the ductility increases with increased average α-platelet thickness. The greater plate thickness facilitates slip and avoids severe pile-up of dislocations in α phase, resulting in the augmentation of the fracture strain as well as decrease of the strength of Ti64. Finally, the variation of yield stress with average α-platelet thickness satisfies Hall-Petch relationship at both quasi-static and dynamic loading strain-rates.