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X-RAY DIFFRACTION STUDY ON THE FORMATION OF ULTRAFINE NANOSTRUCTURES BY CRYSTALLIZATION OF METALLIC GLASSES

机译：金属玻璃结晶化形成超细纳米结构的X射线衍射研究

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The influence of iron addition on the crystallization behavior of Zr_(65)Al_(7.5)Cu_(17.5)Ni_(10) bulk metallic glass was investigated by X-ray diffraction. Addition of iron in amorphous Zr_(65)Al_(7.5)Cu_(17.5)Ni_(10) _(100-X)Fe_X (0 ≤x ≤ 20) leads to a changed crystallization sequence and to the formation of nanocrystals. The formation of a cubic NiTi2-type phase (S.G. Fd 3m , a_o=1.22 nm) is the first step of crystallization in amorphous alloys with iron contents x ≥ 1. Depending on the iron content the average crystallite size decreases to the nanometer regime. Ultrafine nanoclusters of down to 2 nm in size are formed as the first step of crystallization for amorphous Zr_(52)Al_6Cu_(14)Ni_8Fe_(20). The 2 nm clusters grow by Ostwald ripening during isothermal annealing up to 5 nm average crystallite size. Atomic pair correlation functions of the nanostructured states as well as transmission electron microscopy are in agreement with results from Rietveld refinement.

机译：通过X射线衍射研究了铁的添加对Zr_（65）Al_（7.5）Cu_（17.5）Ni_（10）块状金属玻璃结晶行为的影响。在非晶态Zr_（65）Al_（7.5）Cu_（17.5）Ni_（10）_（100-X）Fe_X（0≤x≤20）中添加铁会导致晶化顺序发生变化并形成纳米晶体。在铁含量x≥1的非晶态合金中，形成立方NiTi 2型相（S.G. Fd 3m，a_o = 1.22 nm）是结晶的第一步。根据铁含量的不同，平均晶粒尺寸会减小至纳米范围。作为非晶态Zr_（52）Al_6Cu_（14）Ni_8Fe_（20）结晶的第一步，形成了尺寸低至2 nm的超细纳米团簇。 2 nm团簇在等温退火过程中通过奥斯特瓦尔德（Ostwald）熟化而生长，平均晶粒尺寸达到5 nm。纳米结构态的原子对相关函数以及透射电子显微镜与Rietveld改进的结果一致。

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《Advances in X-ray analysis (ICDD2001)》|2001年|p.104-109|共6页
会议地点 Steamboat Springs CO(US);Steamboat Springs CO(US);Steamboat Springs CO(US)
作者
N. Mattern;
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作者单位

Institut für Festk?rper- und Werkstofforschung Dresden, Postfach, D-01171 Dresden;

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原文格式 PDF
正文语种 eng
中图分类 X射线、紫外线、红外线;
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X-RAY DIFFRACTION STUDY ON THE FORMATION OF ULTRAFINE NANOSTRUCTURES BY CRYSTALLIZATION OF METALLIC GLASSES

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