Influence of Low Oxygen Contents and Alloy Refinement on the Glass Forming Ability of Zr52.5Cu17.9Ni14.6Al10Ti5
Influence of Low Oxygen Contents and Alloy Refinement on the Glass Forming Ability of Zr52.5Cu17.9Ni14.6Al10Ti5
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DOI：
10.2320/matertrans.43.3206
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发表时间：
2002-12
影响因子：
1.2
通讯作者：
A. Kündig;Daniele Lepori;A. Perry;S. Rossmann;A. Blatter;A. Dommann;P. Uggowitzer
中科院分区：
文献类型：
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作者：
A. Kündig;Daniele Lepori;A. Perry;S. Rossmann;A. Blatter;A. Dommann;P. Uggowitzer
通过金相、X射线衍射和楔形铸件的氧分析，研究了添加0.1、0.3和1.0原子%的C、Si、Ca、Sc和La对合金Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 玻璃形成能力的影响。在原始合金中，即使在低浓度下，也观察到氧对玻璃形成能力的非常显着的影响。发现少量的附加元素会显着影响玻璃形成能力。在含 100-120ppm 氧的合金中添加 Sc，可将非晶锭厚度从 4.5 毫米提高到 10 毫米。这些结果通过额外的样品得到了证实，并且发现添加 0.03% 至 0.06%Sc 时具有最佳的玻璃形成能力。通过金相学测量的楔块中的最大非晶厚度与通过各种改性合金的 X 射线衍射测量的厚度相关，精确度约为 1 毫米。利用对一系列不同 Sc 浓度样品的差示扫描量热法和差热分析结果，讨论了通过这些掺杂剂增强玻璃形成的可能机制，以及它们仅在有限浓度范围内有效的原因。
The effect of additions of C, Si, Ca, Sc and La at levels of 0.1, 0.3 and 1.0 atomic percent on the glass forming ability of the alloy Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 has been investigated by means of metallography, X-ray diffraction and oxygen analysis using wedge shaped castings. In the original alloy, a very marked influence of oxygen on the glass forming ability is observed even at low concentrations. Low amounts of additional elemehts were found to influence the glass forming ability significantly. Adding Sc to alloys containing 100-120ppm oxygen increases the glass forming ability from 4.5 to 10 mm in terms of amorphous ingot thickness. These results were confirmed with additional samples, and best glass forming ability was found with additions of 0.03% to 0.06%Sc. The maximum amorphous thickness in the wedges as measured by metallography correlates within an accuracy of about 1 mm with that measured by X-ray diffraction over a wide range of modified alloys. A possible mechanism for the enhancement of glass formation through these dopants, and reasons for their effectiveness over only a limited concentration range, are discussed using results from differential scanning calorimetry and differential thermal analysis on a series of samples with different Sc concentrations.