Chatterjee Arya, Popov Dmitry, Velisavljevic Nenad, Misra Amit
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
Argonne National Laboratory, HPCAT, X-ray Science Division, Lemont, IL 60439, USA.
Nanomaterials (Basel). 2022 Apr 29;12(9):1514. doi: 10.3390/nano12091514.
A state of the art, custom-built direct-metal deposition (DMD)-based additive manufacturing (AM) system at the University of Michigan was used to manufacture 50Cu-50Fe alloy with tailored properties for use in high strain/deformation environments. Subsequently, we performed preliminary high-pressure compression experiments to investigate the structural stability and deformation of this material. Our work shows that the alpha (BCC) phase of Fe is stable up to ~16 GPa before reversibly transforming to HCP, which is at least a few GPa higher than pure bulk Fe material. Furthermore, we observed evidence of a transition of Cu nano-precipitates in Fe from the well-known FCC structure to a metastable BCC phase, which has only been predicted via density functional calculations. Finally, the metastable FCC Fe nano-precipitates within the Cu grains show a modulated nano-twinned structure induced by high-pressure deformation. The results from this work demonstrate the opportunity in AM application for tailored functional materials and extreme stress/deformation applications.
密歇根大学使用了一台先进的、定制的基于直接金属沉积（DMD）的增材制造（AM）系统来制造具有定制性能的50Cu-50Fe合金，用于高应变/变形环境。随后，我们进行了初步的高压压缩实验，以研究这种材料的结构稳定性和变形情况。我们的工作表明，Fe的α（BCC）相在可逆转变为HCP之前，在高达约16 GPa的压力下是稳定的，这比纯块状Fe材料至少高几个GPa。此外，我们观察到Fe中Cu纳米析出物从众所周知的FCC结构转变为亚稳BCC相的证据，而这仅通过密度泛函计算得到过预测。最后，Cu晶粒内的亚稳FCC Fe纳米析出物呈现出由高压变形诱导的调制纳米孪晶结构。这项工作的结果证明了增材制造在定制功能材料和极端应力/变形应用方面的机会。
