论文标题
通过选择性激光融化处理的商业纯净Ni中的二十面体晶体晶体增强了成核
Icosahedral quasicrystal enhanced nucleation in commercially pure Ni processed by selective laser melting
论文作者
论文摘要
这项工作为发生在选择性激光融化的商业化的ni粉末的激光融化过程中提供了明确的证据。这种固化机制最近才在几种合金中报道，并且迄今为止从未在纯金属中观察到这种固化机制，它是由于由于液体中二十面体短距离顺序存在而形成的IQC的一级晶粒的固化。 IQC增强成核的发生是从SLM加工后的纯Ni样品中的观察结果推断出来的，这些样品的部分不一分b，部分不连贯的双胞胎边界以及共享共同<110>五倍的对称轴的双晶对的簇簇。这项工作进一步证明了添加剂制造方法可能构成一个宝贵的工具，用于研究固化基础和设计前所未有的晶界网络。
This work provides unambiguous evidence for the occurrence of icosahedral quasicrystal (iQC) enhanced nucleation during selective laser melting of gas atomized commercially-pure Ni powders. This solidification mechanism, which has only been recently reported in a few alloys and has to date never been observed in pure metals, consists on the solidification of grains of the primary phase on the facets of iQCs formed due to the presence of icosahedral short range order in the liquid. The occurrence of iQC enhanced nucleation has been inferred from the observation in the SLM processed pure Ni samples of an excess fraction of partially incoherent twin boundaries and of clusters of twinned grain pairs sharing common <110> five-fold symmetry axes. This work further evidences that additive manufacturing methods may constitute an invaluable tool for investigating the fundamentals of solidification and for the design of unprecedented grain boundary networks.
