Xie Yuehuang, Xia Tian, Zhou Dengshan, Luo Yifei, Zeng Wei, Zhang Zhen, Wang Jun, Liang Jiamiao, Zhang Deliang
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Nanoscale. 2020 Mar 7;12(9):5347-5352. doi: 10.1039/c9nr09512h. Epub 2020 Feb 26.
A CoCrFeNiMn high entropy alloy with a novel nanostructure consisting of ultrafine grains, TiO(C) nanoparticles and nanotwins has been fabricated. It achieves an ultrahigh tensile yield strength of 1507 MPa by coupling multiple strengthening mechanisms, including grain boundary strengthening, twin boundary strengthening, nanoparticle strengthening and dislocation strengthening. The work hardening ability is also improved by coupling the interactions of dislocations with nanoparticles and nanotwins during plastic deformation, leading to a good tensile ductility with a uniform elongation of 4.7%.
一种具有由超细晶粒、TiO(C)纳米颗粒和纳米孪晶组成的新型纳米结构的CoCrFeNiMn高熵合金已被制备出来。通过耦合多种强化机制，包括晶界强化、孪晶界强化、纳米颗粒强化和位错强化，它实现了1507MPa的超高拉伸屈服强度。在塑性变形过程中，通过耦合位错与纳米颗粒和纳米孪晶的相互作用，加工硬化能力也得到了提高，从而导致良好的拉伸延展性，均匀伸长率为4.7%。
