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首页> 外文期刊>Journal of nanomaterials >Influence of Milling Time on Structural and Microstructural Parameters of Ni50Ti50 Prepared by Mechanical Alloying Using Rietveld Analysis
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Influence of Milling Time on Structural and Microstructural Parameters of Ni50Ti50 Prepared by Mechanical Alloying Using Rietveld Analysis

机译：铣削时间对机械合金化Rietveld分析制备的Ni50Ti50的组织和微结构参数的影响

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摘要

Nanostructured Ni50Ti50 powders were prepared by mechanical alloying from elemental Ni and Ti micrometer-sized powders, using a planetary ball mill type Fritsch Pulverisette 7. In this study, the effect of milling time on the evolution of structural and microstructural parameters is investigated. Through Rietveld refinements of X-ray diffraction patterns, phase composition and structural/microstructural parameters such as lattice parameters, average crystallite size , microstrain , and stacking faults probability (SFP) in the frame of MAUD software have been obtained. For prolonged milling time, a mixture of amorphous phase, NiTi-martensite (B19′), and NiTi-austenite (B2) phases, in addition to FCC-Ni(Ti) and HCP-Ti(Ni) solid solutions, is formed. The crystallite size decreases to the nanometer scale while the internal strain increases. It is observed that, for longer milling time, plastic deformations introduce a large amount of stacking faults in HCP-Ti(Ni) rather than in FCC-Ni(Ti), which are mainly responsible for the observed large amount of the amorphous phase.
机译：使用Fritsch Pulverisette 7型行星式球磨机，通过从元素Ni和Ti微米级粉末中机械合金化制备纳米结构Ni50Ti50粉末。在这项研究中，研究了研磨时间对结构和微观结构参数演变的影响。通过X射线衍射图的Rietveld精炼，获得了MAUD软件框架中的相组成和结构/微结构参数，例如晶格参数，平均微晶尺寸，微应变和堆垛层错概率（SFP）。为了延长研磨时间，除了FCC-Ni（Ti）和HCP-Ti（Ni）固溶体之外，还形成了非晶相，NiTi-马氏体（B19'）和NiTi-奥氏体（B2）相的混合物。微晶尺寸减小到纳米级，而内部应变增加。可以看出，对于较长的铣削时间，塑性变形会在HCP-Ti（Ni）中而不是在FCC-Ni（Ti）中引入大量的堆垛层错，这主要是观察到的大量非晶相。

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