High-temperature “Inverse” Hall-Petch relationship and fracture behavior of TA15 alloy

Shaolong Li, Shufeng Li, Lei Liu, Huiying Liu, Chuanyun Wang, Philip J. Withers, Yuntian Zhu, Lina Gao, Shaodi Wang, Biao Chen, Wangtu Huo, Jianbo Gao, Xin Zhang, Bo Li

科研成果: 期刊稿件文章同行评审

24 引用 (Scopus)

摘要

The Hall-Petch relationship is important for material design at room temperature. However, it is not well studied at high temperatures. In this work, the influence of different microstructures on the high-temperature mechanical behavior and corresponding softening mechanisms of high-temperature titanium alloy TA15 (Ti-6.5Al-2Zr-1Mo-1 V, wt.%) were studied. Specimens with duplex, Widmanstätten, and coarse Widmanstätten microstructures were obtained through powder metallurgy. High-temperature tensile tests were carried out between 500 and 650°C. It was found that the fracture mode of the Widmanstätten microstructure was transgranular at 500 °C and 550 °C, but intergranular at 600 °C and 650 °C. EBSD analysis revealed that the high-temperature deformation was facilitated by several mechanisms including GB softening, GB migration, grains rotation, and activation of multiple slip systems. High temperature nanoindentation indicated sofenting of individual grains with increasing temperature. In-situ tensile testing under SEM revealed deformation was primarily in grain interior at room temperature, and GBs played a significant role at 650℃. The GB behavior at high temperatures is believed responsible for the inverse Hall-Petch relationship. These findings provide a new perspective for improving the high-temperature mechanical properties and microstructure control of titanium and its alloys.

源语言英语
文章编号103951
期刊International Journal of Plasticity
176
DOI
出版状态已出版 - 5月 2024

指纹

探究 'High-temperature “Inverse” Hall-Petch relationship and fracture behavior of TA15 alloy' 的科研主题。它们共同构成独一无二的指纹。

引用此