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首页> 外文期刊>Journal of Materials Research >Phase evolution in Ni-Nb multilayers upon solid-state reaction
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Phase evolution in Ni-Nb multilayers upon solid-state reaction

机译：固相反应在Ni-Nb多层体中的相演化

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Solid-state amorphization was achieved in the Ni_48 Nb_52 multilayers upon thermal annealing by gradually raising the temperature from 250 to 400 ℃ and staying at 400℃ for 2 h. More interestingly, before complete amorphization, a sequential disordering of first Ni and then Nb crystalline lattices was observed for the first time, and it was essentially the physical origin of an asymmetric growth of the amorphous interlayer during solid-state reaction reported previously in some binary metal systems. In another two multilayered samples with overall compositions of Ni_64 Nb_36 and Ni_70 Nb_30, thermal annealing under similar conditions resulted in the formation of two metastable crystalline phases with face-centered-cubic and hexagonal-close-packed structures, respectively, although an amorphous phase also appeared and coexisted with one of the metastable crystalline phases in the intermediate states. In the ion mixing experiment, such sequential disordering, as well as formation of metastable phases, was also observed in the respective Ni-Nb multilayers upon room-temperature 200-keV xenon ion irradiation. Comparatively, however, ion irradiation eventually induced complete amorphization in all the multilayers at the respective doses, indicating that ion-induced disordering frequently predominated in the competition between amorphization and the growth of a metastable crystalline phase. A Gibbs free energy diagram, including the free energy curves of the newly formed metastable crystalline phases, of the Ni-Nb system was calculated based on Miedema's model. The constructed fr
机译：Ni_48 Nb_52多层膜通过热退火将温度从250℃逐渐升高至400℃并在400℃下保持2 h，实现了固态非晶化。更有趣的是，在完全非晶化之前，首次观察到先是先出现Ni然后是Nb的连续无序，这实际上是先前以某些二进制形式报道的固态反应过程中非晶中间层不对称生长的物理起源。金属系统。在另外两个整体成分为Ni_64 Nb_36和Ni_70 Nb_30的多层样品中，在相似条件下进行热退火会形成两个亚稳的晶相，分别具有面心立方和六方密堆积结构，尽管非晶相也出现并与中间状态的亚稳态结晶相之一共存。在离子混合实验中，在室温200keV氙离子辐照下，在各个Ni-Nb多层膜中也观察到了这种顺序无序以及亚稳相的形成。然而，相比之下，离子辐照最终在所有剂量下在所有多层中诱导完全非晶化，这表明在非晶化和亚稳结晶相生长之间的竞争中，离子诱导的无序化通常占主导地位。基于Miedema模型，计算了Ni-Nb系统的Gibbs自由能图，包括新形成的亚稳晶相的自由能曲线。建造的fr

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