In a molten zinc bath in a continuous galvanizing line (CGL), top dross particles crystallize as Fe–Al–Zn intermetallic compounds. These particles easily adhere to the steel sheets causing surface defects. Therefore, controlling the top dross particles is a key issue. Our study focused on the structural and mechanical characterizations of the top dross particles using an electron probe micro analyzer, X-ray diffraction, electron back scattering diffraction, Vickers hardness measurements, and nano-indentation measurements. The following results were obtained: (1) The crystal structure of the top dross particles Fe_(2)Al_(5)Zn_(x) having 37–38 wt% Fe, 44–45 wt% Al, and 18–19 wt% Zn belongs to the orthorhombic system with lattice constants of a = 7.61 ?, b = 6.48 ?, and c = 4.23 ?. The a -axis of Fe_(2)Al_(5)Zn_(x) becomes shorter, while its b - and c -axes become longer compared to those of the binary Fe_(2)Al_(5). (2) The coarsening of the top dross particles with the faceted interface was postulated to occur as a result of the driving force provided by the anisotropic interface energy between the top dross particles and molten Zn, rather than via the aggregation mechanism. (3) The hardness and the elastic modulus of the top dross particles are the lowest in the [001] orientation, similar to Fe_(2)Al_(5,) and are lower than those of Fe_(2)Al_(5.) (4) The fracture toughness of the top dross particles is approximately 1.1 MPa·m~(1/2), which is slightly lower than that of Fe_(2)Al_(5).
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机译：在连续镀锌线（CGL）中的熔融锌浴中，顶部渣滓颗粒作为Fe-Al-Zn金属间化合物结晶。这些颗粒容易粘附到引起表面缺陷的钢板上。因此，控制顶部渣滓粒子是一个关键问题。我们的研究专注于使用电子探针微分析仪，X射线衍射，电子背散射衍射，维氏硬度测量和纳米缩进测量的顶部渣滓颗粒的结构和机械表征。获得以下结果：（1）具有37-38wt％Fe，44-45wt％Al和18-19wt％的顶部渣滓颗粒Fe_（2）Al_（5）Zn_（X）的晶体结构。 Zn属于与晶格常数为 a = 7.61的晶片常数的晶片系统？， b = 6.48？，和 c = 4.23？。 fe_（2）al_（5）zn_（x）的轴变短，而其 b - 和 c -axes与二进制fe_（2）al_的 c -ax变长（5）。 （2）假设具有刻面界面的顶部堆叠颗粒的凸起，由于顶部渣滓颗粒和熔融锌之间的各向异性界面能量而不是通过聚集机构提供的驱动力。 （3）顶部渣滓颗粒的硬度和弹性模量是[001]取向的最低，类似于FE_（2）AL_（5，），低于FE_（2）AL_（5。） （4）顶部渣滓颗粒的断裂韧性约为1.1MPa·m〜（1/2），略低于Fe_（2）Al_（5）。
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