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Nanocrystallization of gas atomized Cu_(47)Ti_(33)Zr_(11)Ni_8Si_1 metallic glass

机译:气体雾化Cu_(47)Ti_(33)Zr_(11)Ni_8Si_1金属玻璃的纳米晶化

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摘要

Cu_(47)Ti_(33)Zr_(11)Ni_8Si_1 metallic glass powder was prepared by gas atomization. Decomposition in the amorphous alloy and primary crystallization has been studied by differential scanning calorimetry (DSC), x-ray diffraction (XRD), and transmission electron microscopy (TEM). The glassy powder exhibits a broad DSC exotherm prior to bulk crystallization. Controlled annealing experiments reveal that this exotherm corresponds to a combination of structural relaxation and nanocrystallization. A uniform featureless amorphous contrast is observed in the TEM prior to the detection of nanocrystals of 4-6 nm in size. High-resolution TEM studies indicate that this nanocrystalline phase has a close crystallographic relationship with the gamma - CuTi phase having a tetragonal structure. The product of the main crystallization event is also nanocrystalline, hexagonal Cu_(51)Zr_(14), having dimensions of 20 nm. However, there is no evidence for possible amorphous phase separation prior to the nanocrystallization events.
机译:通过气体雾化制备Cu_(47)Ti_(33)Zr_(11)Ni_8Si_1金属玻璃粉末。通过差示扫描量热法(DSC),X射线衍射(XRD)和透射电子显微镜(TEM)研究了非晶态合金中的分解和一次结晶。在块状结晶之前,玻璃状粉末表现出宽的DSC放热。受控退火实验表明,该放热对应于结构弛豫和纳米结晶的组合。在检测尺寸为4-6 nm的纳米晶体之前,在TEM中观察到均匀的无特征非晶对比。高分辨率TEM研究表明,该纳米晶相与具有四方结构的γ-CuTi相具有密切的晶体学关系。主要结晶事件的产物也是尺寸为20 nm的纳米晶体六角形Cu_(51)Zr_(14)。然而,没有证据表明在纳米结晶事件之前可能发生非晶相分离。

著录项

  • 来源
    《Journal of Materials Research》 |2006年第3期|p.597-612|共16页
  • 作者单位

    Leibniz-Institut fur Festkorper- und Werkstofforschung Dresden (IFW) Dresden, Institut fur Metallische Werkstoffe, D-01171 Dresden, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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