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首页> 外文期刊>Journal of Materials Research >Evolution of metastable phases during crystallization of pulsed laser deposited amorphous Al―Fe films
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Evolution of metastable phases during crystallization of pulsed laser deposited amorphous Al―Fe films

机译：脉冲激光沉积非晶态Al-Fe薄膜结晶过程中亚稳相的演变

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摘要

Amorphous thin films of different Al―Fe compositions were produced by plasma/vapor quenching during pulsed laser deposition. The chosen compositions Al_(72)Fe_(28), Al_(40)Fe_(60), and Al_(18)Fe_(82) correspond to Al_5Fe_2 and B2-ordered AlFe intermetallic compounds and α-Fe solid solution, respectively. The films contained fine clusters that increased with iron content. The sequences of phase evolution observed in the heating stage transmission electron microscopy studies of the pulsed laser ablation deposited films of Al_(72)Fe_(28), Al_(40)Fe_(60), and Al_(18)Fe_(82) compositions showed evidence of composition partitioning during crystallization for films of all three compositions. This composition partitioning, in turn, resulted in the evolution of phases of compositions richer in Fe, as well as richer in Al, compared to the overall film composition in each case. The evidence of Fe-rich phases was the B2 phase in Al_(72)Fe_(28) film, the L1_1- and DO_3-ordered phases in Al_(40)Fe_(60) film, and the hexagonal ε-Fe in the case of the Al_(18)Fe_(82) film. On the other hand, the Al-rich phases were Al_(13)Fe_4 for both Al_(72)Fe_(28) and Al_(40)Fe_(60) films and DO_3 and Al_5Fe_2 phases in the case of Al_(18)Fe_(82) film. We believe that this tendency of composition partitioning during crystallization from amorphous phase is a consequence of the tendency of clustering of the Fe atoms in the amorphous phase during nucleation. The body-centered cubic phase has a nucleation advantage over other metastable phases for all three compositions. The amorphization of Al_(18)Fe_(82) composition and the evolution of L1_2 and ε-Fe phases in the Al-Fe system were new observations of this work.
机译：在脉冲激光沉积过程中，通过等离子/蒸气淬火产生了不同Al-Fe组成的非晶薄膜。所选的成分Al_（72）Fe_（28），Al_（40）Fe_（60）和Al_（18）Fe_（82）分别对应于Al_5Fe_2和B2级AlFe金属间化合物和α-Fe固溶体。薄膜中的细团簇随着铁含量的增加而增加。 Al_（72）Fe_（28），Al_（40）Fe_（60）和Al_（18）Fe_（82）成分的脉冲激光烧蚀沉积膜在加热阶段透射电子显微镜研究中观察到的相变序列显示了所有三种组成的膜在结晶过程中组成分配的证据。与每种情况下的总膜组成相比，这种成分分配又导致了富铁和富铝组成相的演变。富铁相的证据是Al_（72）Fe_（28）膜中的B2相，Al_（40）Fe_（60）膜中的L1_1和DO_3有序相，在这种情况下为六角形ε-Fe Al_（18）Fe_（82）膜的厚度。另一方面，对于Al_（72）Fe_（28）和Al_（40）Fe_（60）膜而言，富Al相均为Al_（13）Fe_4，而对于Al_（18）Fe_而言，DO_3和Al_5Fe_2相。 （82）电影。我们认为，这种从非晶态结晶的过程中组分分配的趋势是成核过程中非晶态中铁原子团聚趋势的结果。对于所有三种组成，以体心为中心的立方相都比其他亚稳相具有成核优势。 Al_Fe体系中Al_（18）Fe_（82）组成的非晶化以及L1_2和ε-Fe相的演化是这项工作的新观察。

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