Multistage strain hardening facilitated by in-situ TiO(C) nanoparticles in CoCrFeMnNi high entropy nanocomposite subjected to high strain rate compression

Zhen Zhang, Yuehuang Xie, Jiamiao Liang, Yang Zhou, Sammy Lap Ip Chan, Jun Wang

科研成果: 期刊稿件文章同行评审

4 引用 (Scopus)

摘要

Second phase nanoparticles have been notable reinforcements to enhance strength of high entropy alloys based on Orowan mechanism, but their contributions to improving strain hardening ability through facilitating deformation behaviors are still unclear. In this study, an in-situ TiO(C) nanoparticles reinforced CoCrFeMnNi high entropy nanocomposite was fabricated through powder metallurgy routes. The microstructure subjected to high strain rate compression was investigated to elucidate the deformation behaviors facilitated by TiO(C) nanoparticles and the corresponding contributions to strain hardening ability. The results demonstrated that stacking faults and nanotwins were triggered under the sufficient high flow stress facilitated by Orowan mechanism of TiO(C) nanoparticles. It is noted that a FCC to HCP phase transformation was only nucleated adjacent to TiO(C) nanoparticles due to extra stress concentration. These multiple deformation mechanisms including stacking faults, nanotwins and HCP phase transformation led to multistage strain hardening phenomenon, achieving a simultaneous increase of strength and ductility from 1487 MPa and 51.7% to 1735 MPa and 68.2% compared with CoCrFeMnNi high entropy alloy without nanoparticles.

源语言英语
文章编号108238
期刊Intermetallics
167
DOI
出版状态已出版 - 4月 2024
已对外发布

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