Unveiling the correlation between anomalous hardening and grain boundary diffusional transformation in ω single-phase nano-grained Ti-Fe alloy

doi:10.1016/j.jmst.2024.01.099

Abstract

Abstract: A metastable ω single-phase nanograined (NG) Ti-Fe alloy was synthesized using laser inert-gas condensation (IGC). Upon being annealed at 360 °C, the NG Ti-Fe alloy exhibited a remarkable ultra-hardening, increasing the hardness from 4.7 to 8.6 GPa. Subsequent findings revealed an unexpected hardness enhancement, rising from 6.6 GPa at 420 °C to 7.6 GPa at 460 °C, despite the occurrence of grain growth. In-depth investigations into the strengthening mechanisms of the NG Ti-Fe alloy were conducted using in-situ synchrotron high-energy X-ray diffraction (XRD) and transmission electron microscopy (TEM). The comprehensive analysis unveiled that the diffusion-controlled structure evolution during annealing played a pivotal role in enhancing the alloy's mechanical properties. This study not only presents the synthesis of a novel metastable alloy but also provides valuable insights into the intricate relationship between diffusion-controlled structure evolution and the resulting superior mechanical properties.

Key words: Laser-inert gas condensation, Nanograined Ti-Fe alloy, Phase transformation, Dislocations, Strengthening

Shangshu Wu, Zongde Kou, Song Tang, Si Lan, Qingquan Lai, Junjie Wang, Jinru Luo, Xuefeng Xie, Rong Huang, Guiyuan Zheng, Gerhard Wilde, Tao Feng. Unveiling the correlation between anomalous hardening and grain boundary diffusional transformation in ω single-phase nano-grained Ti-Fe alloy[J]. J. Mater. Sci. Technol., 2024, 203: 53-60.

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